CN118706985A - A method and system for improving the accuracy of identifying odorous substances in polluted waters - Google Patents

Abstract

The present invention discloses a method and a system for improving the accuracy of identifying odorous substances in polluted waters. A gas chromatograph sequentially separates and generates several gas samples, and each gas sample is divided into two parts, which are set as a first part and a second part. The first part is transported to a detector for qualitative and quantitative analysis. The second part is heated or cooled to simulate the environmental temperature of the polluted water site, mixed with a proper amount of humid air to simulate the gas composition and environmental humidity of the polluted water site, and finally transported to a sniffing port for a sniffing operator to smell and distinguish. Based on the specific scenario of polluted waters, the present invention heats or cools the gas samples separated by the gas chromatograph to simulate the environmental temperature of the polluted water site, mixes with a proper amount of humid air to simulate the gas composition and environmental humidity of the polluted water site, restores the environmental factors existing in the polluted waters as much as possible, reduces the identification difficulty of the olfactory operator, and thus improves the accuracy of the present invention in identifying odorous substances.

Description

A method and system for improving the accuracy of identifying odorous substances in polluted waters

Technical Field

The present invention belongs to the technical field of sewage treatment, and specifically relates to a method and a system for improving the accuracy of identifying odorous substances applicable to polluted waters.

Background Art

Polluted waters that emit odors will seriously affect the living environment of nearby residents and may even endanger their health. The source of the odor needs to be addressed to improve the quality of life for residents. However, in the process of odor control, the problem of unknown sources of odors often arises, that is, it is impossible to conduct target screening of odorous substances.

In order to solve the above problems, the patent document with application number 202210641598.7 discloses a method for accurately identifying odor-causing substances based on non-target screening. The specific steps are as follows: S1, sample pretreatment; S2, non-target screening method; S3, sensory evaluation; S4, odor activity value analysis; S5, comprehensive evaluation analysis; S6, determination of key odor-causing factors.

The above-mentioned prior art discloses a method for accurately identifying odor-causing factors based on non-target screening coupled sensory evaluation, olfactory detection technology, odor activity value, and comprehensive evaluation analysis, and constructs olfactory evaluation rules for odorous gases and an evaluation system for key odor substances. It provides new ideas and methods for solving the problem of "being able to smell but not being able to measure" that occurs in actual monitoring, and provides technical methods and application support for the subsequent accurate tracing and control of odor pollution.

However, the existing technology is to separate the gas samples of various substances by the gas chromatograph, and send part of them to the detector for qualitative and quantitative analysis, and the other part is for the olfactory staff to smell. The applicant and the inventor have deeply explored the sewage treatment technology and found in actual operation that: for the specific scene of polluted waters, the odor smelled by the olfactory staff on site is closely related to environmental factors such as humidity and temperature. Therefore, it is difficult for the olfactory staff who return to the laboratory to smell the odor very close to the polluted waters again, which increases the difficulty of the olfactory staff to distinguish, and may further reduce the accuracy of identifying odorous substances, which is not conducive to subsequent treatment work.

Summary of the invention

In view of the problems in the related art, the present invention proposes a method and a system for improving the accuracy of identifying odorous substances in polluted waters, so as to overcome the above-mentioned technical problems existing in the existing related art.

The technical solution of the present invention is achieved in this way:

A method for improving the accuracy of identifying odorous substances in polluted waters, wherein a gas chromatograph sequentially separates a plurality of gas samples, each of which is divided into two parts, namely, a first part and a second part;

The first part is transported to the detector for qualitative and quantitative analysis;

The second part heats or cools down to simulate the ambient temperature of the polluted water area, mixes an appropriate amount of humidified air to simulate the gas composition and ambient humidity of the polluted water area, and finally delivers it to the olfactory port for the olfactory personnel to smell and distinguish.

Through the correspondence method of "gas sample-time-detector result", after the olfactory observer points out the gas sample with odor, he/she can check the detector results corresponding to the gas sample in that time period to obtain the odorous substance and then determine the odorous substance that pollutes the waters.

Compared with the prior art, the present invention is based on the specific scenario of polluted waters. It heats or cools the gas sample separated by the gas chromatograph to simulate the ambient temperature of the polluted waters, mixes an appropriate amount of humid air to simulate the gas composition and ambient humidity of the polluted waters, and restores the environmental factors existing in the polluted waters as much as possible, reducing the difficulty of identification for the olfactory personnel, and strives to make the olfactory personnel smell the same or basically the same odor of the polluted waters again, thereby improving the accuracy of the present invention in identifying odorous substances, which is facilitating subsequent odor control work.

Furthermore, the prior art in this field tends to overlook another problem: the odor smelled by the olfactory on-site is a complex product, which is why the present invention needs to mix the gas sample into the air before it is smelled, and also restore the ambient temperature and humidity as much as possible. It is also necessary to consider that the odor smelled by the olfactory on-site may be formed by one or more odorous substances, and the conventional technology in this field is to mix the gas samples of various substances separated by the gas chromatograph with carrier gas in sequence, and then transport them to the detector for qualitative and quantitative analysis and for the olfactory to smell, that is, there is no design to mix the gas samples of various substances separated by the gas chromatograph in one or more ways to form a mixed gas sample, which may also make it difficult for the olfactory returning to the laboratory to smell the odor near the polluted waters again.

Based on the above considerations, preferably, the present invention is applicable to a method for improving the accuracy of identifying odorous substances in polluted waters, comprising the following steps:

1) The gas chromatograph sequentially separates and generates a plurality of first gas samples, each of which is divided into two parts, namely, a first part and a second part;

2) The first part is transported to the detector for qualitative and quantitative analysis;

The second part is sequentially transported to the gas storage module for storage to form several second gas samples. Some of the second gas samples are heated or cooled to simulate the ambient temperature of the polluted waters, mixed with a proper amount of humid air to simulate the gas composition and ambient humidity of the polluted waters, and then sequentially transported to the sniffing port for the olfactory staff to smell and distinguish. The olfactory staff points out a second gas sample that is the same or substantially the same as the odor of the polluted waters to determine the odorous substances in the polluted waters.

Or if the smeller points out more than one second gas sample with a foreign odor, proceed to step 3);

3) More than one second gas samples pointed out to have odor are mixed in sequence in the form of permutations and combinations or in the combinations designated by the olfactory inspectors or testers to form one or more third gas samples. The formed third gas samples are heated or cooled to simulate the ambient temperature of the polluted water site, mixed with an appropriate amount of humid air to simulate the gas composition and ambient humidity of the polluted water site, and then transported to the olfactory port in sequence for the olfactory inspectors to smell and distinguish. The olfactory inspectors point out a third gas sample that is closest to or the same as the odor of the polluted waters to determine the odorous substances in the polluted waters.

The present invention is designed to first provide the second gas sample separated by the gas sample chromatograph for the olfactory to smell, and distinguish whether there is the same odor as the polluted water area. If the gas sample with the same odor as the polluted water area is smelled, the sniffing is terminated, and the odorous substances in the polluted water area are clearly identified in combination with the detection results of the detector, and targeted treatment can be carried out, saving procedures, and there is no need to carry out step 3);

If the olfactory detecter does not smell the same or very similar odor as the polluted waters, but the separated second gas sample generally contains two major categories, odorous and odorless, the odorless gas sample or the clearly known odorless substance obviously does not need to be subsequently mixed to form the third gas sample and can be directly screened out. Therefore, the present invention is designed to sequentially mix the odorous gas samples pointed out by the olfactory detecter in a permutation and combination manner to form the third gas sample;

The design of mixed gas samples further improves the accuracy of the present invention in identifying odorous substances. At the same time, although the present invention is a non-target screening, it has accumulated certain available experience based on the data of inspection personnel and laboratories such as nearby factory types and living areas. Therefore, the present invention also designs a mixed gas sample combination that can be specified by olfactory personnel and inspection personnel to speed up the olfactory confirmation procedure.

More preferably, the above method for improving the accuracy of identifying odorous substances in polluted waters comprises the following steps:

1-a) The smeller conducts on-site smelling of the polluted waters, collects odorous water samples and/or odorous gas samples of the polluted waters, and records the ambient temperature and humidity of the polluted waters;

1-b) Pre-treating the odorous water sample and/or odorous gas sample to meet the sampling requirements of the gas chromatograph;

1-c) the odorous water sample or/and odorous gas sample which has been pre-treated enters a gas chromatograph, and a carrier gas (such as helium, nitrogen, etc.) is introduced to mix with the sample to form an unseparated gas sample, and the substances in the unseparated gas sample are separated in sequence by the gas chromatograph to generate a plurality of the first gas samples, and each of the first gas samples is divided into two parts, which are set as the first part and the second part;

2-a) The first part is transported to a detector for qualitative and quantitative analysis;

The second part is sequentially transported to the gas storage module for separate storage, and a unit time period is pre-set, and the gas is collected and numbered in the set unit time period to form a plurality of the second gas samples, which are collected to the gas chromatograph for material separation;

Specifically, the unit time period can be set to every minute, every five minutes, etc., and the detection personnel can set it according to the specific situation.

2-b) a plurality of second gas sample extraction portions are sequentially delivered to the sniffing port;

According to the ambient temperature recorded in step 1-a), the second gas sample is heated or cooled during transportation to simulate the ambient temperature of the polluted waters. According to the ambient humidity recorded in step 1-a), an appropriate amount of humidified air is mixed to simulate the gas composition and ambient humidity of the polluted waters. The olfactory smeller smells the second gas sample.

2-c) The smeller points out a second gas sample that is the same or substantially the same as the odor of the polluted waters, records its odor characteristics, checks the number of the second gas sample and its corresponding time period, and then checks the substances detected by the detector in the time period, obtains the odor characteristics of the substance through literature retrieval or experiments, and compares the consistency of the odor characteristics to determine the odorous substances in the polluted waters. Alternatively, if the smeller points out more than one second gas sample with odor, then execute step 3);

3) More than one second gas samples pointed out to have odor are mixed in sequence in the form of permutations and combinations or in the combinations designated by the olfactory inspectors or testers to form one or more third gas samples. The formed third gas samples are heated or cooled to simulate the ambient temperature of the polluted water site, mixed with an appropriate amount of humid air to simulate the gas composition and ambient humidity of the polluted water site, and then transported to the olfactory port in sequence for the olfactory inspectors to smell and distinguish. The olfactory inspectors point out a third gas sample that is closest to or the same as the odor of the polluted waters to determine the odorous substances in the polluted waters.

Since odorous substances are often at trace levels, if the olfactory detector smells an odor but the detector does not output a test result, the odorous water sample and/or odorous gas sample will be re-enriched to reach a detectable level to identify the odorous substances. Sample enrichment is a routine operation in this field and will not be elaborated here.

In addition, olfactories in this field generally have standardized olfactory test records or experimental specifications when sniffing. Olfactresses can operate according to the specifications without affecting the implementation of the technical solution of the present invention.

Based on the above-mentioned method for improving the accuracy of identifying odorous substances applicable to polluted waters, the present invention also discloses a system for improving the accuracy of identifying odorous substances applicable to polluted waters, including a gas chromatograph, a detector, a controller, a first carrier gas supply source, a second carrier gas supply source, a dry air supply source, a temperature control module, a humidification module, a sniffing port and a pipeline structure.

The output end of the first carrier gas supply source is connected to the gas chromatograph.

The gas chromatograph comprises a separation chromatographic column with a coating, and the output end of the gas chromatograph and the output end of a second carrier gas supply source are connected and collected through a pipeline structure, and then directly or indirectly connected to the input end of the detector and the input end of the sniffing port respectively through the pipeline structure.

The output end of the dry air supply source is connected to the input end of the humidification module, and the output end of the humidification module is also connected to the input end of the sniffing port.

The temperature control module is provided at least near the input end of the sniffing port to heat or cool the gas in the pipeline.

Preferably, the controller is connected to a human-computer interaction module, which can be a display screen, keyboard, mouse, touch screen display, etc., to facilitate detection personnel to monitor and view various real-time data (for example, view the chromatogram output by the detector, temperature, etc.), set parameters as needed, and view the start/shutdown status of functional modules.

Specifically, the detector is a mass spectrometer MS, PID, ECD, etc. When the detector is a mass spectrometer MS, the carrier gas supplied by the first carrier gas supply source and the second carrier gas supply source is helium; when the detector is a PID or ECD, the carrier gas supplied by the first carrier gas supply source and the second carrier gas supply source is nitrogen.

The first carrier gas supply source and the second carrier gas supply source are commercially available gas cylinders storing target carrier gas, without any special limitation.

Preferably, the pipeline structure includes a four-way valve, a three-way valve and a plurality of conduits;

The first interface of the four-way valve is directly or indirectly connected to the gas output end of the gas chromatograph through a conduit;

The second interface of the four-way valve is directly or indirectly connected to the input end of the detector through a conduit;

The third interface of the four-way valve is directly or indirectly connected to the output end of the second carrier gas supply source through a conduit;

The fourth interface of the four-way valve is directly or indirectly connected to the fifth interface of the three-way valve through a conduit;

The sixth interface of the three-way valve is directly or indirectly connected to the output end of the humidification module through a conduit;

The seventh interface of the three-way valve is directly or indirectly connected to the input end of the sniffing port through a conduit;

In particular, the conduit may be a hollow chromatography column without a coating.

Preferably, the humidification module comprises a flow regulating valve, a humidification bottle, an input air pipe, an output air pipe, an air input port and a moisture output port;

The air input port is respectively connected to the output end of the dry air supply source and the input end of the input air pipe. A flow regulating valve is provided between the air input port and the dry air supply source. The output end of the input air pipe extends below the liquid level of the humidification bottle, and the input end of the output air pipe extends into the humidification bottle and is located above the liquid level. The humidification bottle is filled with pure water, and a certain space is reserved between the pure water liquid level and the bottle mouth to accommodate humid air.

The output end of the output air pipe is connected to the moisture output port, and the moisture output port is directly or indirectly connected to the olfactory port.

A porous wetting element (such as a sponge, etc.) is installed at the output end of the input air pipe. The porous wetting element is located below the liquid level of the humidifying bottle. After the dry air is poured into the porous wetting element, it is dispersed and then fully moistened, and then escapes upward to above the liquid level and is output from the output air pipe.

Specifically, the input air pipe and the output air pipe are made of polytetrafluoroethylene material.

The humidifier bottle includes a bottle body and a bottle cap, the bottle body is made of transparent glass, the bottle cap is made of PP hard plastic, a Teflon gasket is provided on the inner side of the bottle cap, and the bottle cap is provided with two through holes for the input air pipe and the output air pipe to pass through, the input air pipe and the output air pipe are stuck in the through holes and form a sealed contact to avoid air leakage.

The humidification module includes a casing, on which the air input port, moisture output port and humidification bottle fixing clamp are arranged, and components such as a through hole for the air supply pipe to pass through, a switch, a COM data line socket, and an I/O data interface are also adaptively arranged.

Preferably, the temperature control module has a heating gas function and a cooling gas function, and the opening or closing of each function of the temperature control module and the adjustment of the temperature are controlled by a controller.

The temperature control module includes a heating sleeve and a refrigeration component.

The heating sleeve comprises a bendable copper tube, a resistance heating wire, heat-insulating cotton and a temperature rise sensor, and at least the pipe structure close to the sniffing port is wrapped with the heating sleeve.

The outer periphery of the pipeline structure close to the sniffer port is wrapped with a flexible copper tube, a resistance heating wire and thermal insulation cotton in sequence. The resistance heating wire generates heat to conduct heat to the flexible copper tube, and the flexible copper tube conducts heat to the pipeline structure, thereby heating the gas sample; the temperature rise sensor monitors the temperature of the resistance heating wire and transmits the temperature information to the controller.

The bendable copper pipe also has a protective effect on the pipeline structure, and the thermal insulation cotton has thermal insulation and protective effects.

The refrigeration component comprises a refrigeration cavity for accommodating gas, a semiconductor refrigeration sheet and a temperature reduction sensor. The refrigeration component is arranged between a pipeline structure wrapped with a heating sleeve and a sniffing port.

The refrigeration cavity has an inlet and an outlet, the inlet is directly or indirectly connected to a pipe structure wrapped with a heating sleeve, and the outlet is directly or indirectly connected to the input end of the olfactory port; the semiconductor refrigeration plate cools the gas in the refrigeration cavity to a specified temperature (i.e., the ambient temperature of the polluted water area), and the cooling sensor monitors the temperature in the refrigeration cavity.

It should be noted that the semiconductor refrigeration sheet of the present invention does not need to excessively pursue ultra-low temperature performance. Generally speaking, if the temperature is too low, the odor is difficult to dissipate, and there are few odor incidents. It is also not suitable to sample at low temperatures. Combined with the winter temperature in Guangdong, the lowest temperature that the semiconductor refrigeration sheet can produce is 10-15°C.

Preferably, the olfactory port is a trumpet-shaped structure with a narrow mouth and a wide mouth, the outer contour of the wide mouth fits the shape of the nose, and the narrow mouth can be detachably mounted on the side of a handheld box. The handheld box is designed to be convenient for the olfactory worker to hold, and the three-way valve and refrigeration assembly can also be integrated into the handheld box to avoid too many exposed components and excessive fragmentation.

Specifically, the refrigeration assembly is arranged on one side of the inside of the handheld box close to the sniffing port, the semiconductor refrigeration sheet is installed on the top of the refrigeration cavity, and the temperature reduction sensor is installed on the bottom of the refrigeration cavity;

The three-way valve is installed and fixed on the other side, the fifth interface of the three-way valve is connected to the pipeline structure wrapped with a heating sleeve, the sixth interface of the three-way valve is connected to the output end of the humidification module, and the seventh interface of the three-way valve is connected to the inlet of the refrigeration cavity.

The handheld box is provided with two through openings on the opposite side of the sniffing port for the passage of a pipeline structure wrapped with a heating sleeve and a pipeline connected with the humidification module.

The narrow opening and the hand-held box can be designed to be snap-fitted and installed and removed by rotation.

Preferably, a gas storage and mixing device is provided between the fourth interface and the fifth interface.

The gas storage and mixing device comprises a gas injection module, a gas storage module and a gas extraction module.

The gas injection module includes a gas injection drive source and a gas injection syringe, and the gas storage module includes a plurality of gas sample storage bottles, wherein the gas sample storage bottles are used to store the second gas sample or the gas sample storage bottles are used to store the second gas sample and the third gas sample.

The gas injection syringe includes a gas injection push rod, a gas injection cylinder component and a gas injection needle. The interior of the gas injection cylinder component has a gas injection cylinder cavity for accommodating gas. One side of the gas injection cylinder cavity is open to allow the gas injection push rod to extend and slide in, and the other side of the gas injection cylinder cavity is fixed and connected to the gas injection needle. The gas injection cylinder component and the gas injection needle remain relatively still.

The gas injection cylinder has at least one first connecting pipe protruding from the outer surface, the first connecting pipe is connected to the gas injection cylinder cavity, and the inner end of the first connecting pipe is flush with the inner surface of the gas injection cylinder cavity to avoid affecting the sliding movement of the gas injection push rod.

The gas injection driving source drives the gas injection syringe to move as a whole so that the gas injection needle can penetrate into or withdraw from the gas sample storage bottle and drives the gas injection push rod to slide in the gas injection cylinder cavity.

The first connecting pipe is externally connected to the fourth interface, collects gas according to a preset unit time period and then injects it into the gas sample storage bottle to form a second gas sample.

Specifically, the bottle mouth of the gas sample storage bottle is provided with an elastic injection rubber plug for the gas injection needle to penetrate, and the elastic injection rubber plug seals itself after the gas injection needle exits the gas sample storage bottle.

More preferably, the gas injection cylinder has a second connecting pipe protruding from the outer surface, the structure of the second connecting pipe is the same as the first connecting pipe, and the second connecting pipe is externally connected to a clean gas supply source; the first connecting pipe is arranged near the gas injection needle, and the second connecting pipe is arranged near the open end of the cylinder cavity. The clean gas supply source and the second connecting pipe are used to introduce clean gas to purge and clean the gas injection cylinder cavity every time a portion of the second gas sample is delivered to the gas sample storage bottle. The clean gas is a gas that is odorless and does not react with the gas sample to produce odorous products, such as nitrogen. .

Specifically, the gas injection module also includes a gas injection base shell, and the gas injection drive source includes a first motor and a second motor.

A first fixed shell seat and a second fixed shell seat are provided on both sides of the top surface of the gas injection base shell, and a gas injection movable seat and a gas injection screw are provided between the first fixed shell seat and the second fixed shell seat, and the two ends of the gas injection screw are respectively fixed to the first fixed shell seat and the second fixed shell seat; the gas injection movable seat is provided with a threaded hole adapted for the gas injection screw, and the gas injection screw is screwed into the threaded hole and passes through the gas injection movable seat.

The first fixed shell seat is equipped with a first clamping piece for clamping the gas injection cylinder member, the first clamping piece and the gas injection cylinder member remain relatively stationary, the first clamping piece is installed on the first movable column, the first movable column is directly or indirectly connected to the first motor and driven by it, the top surface of the first fixed shell seat is provided with a first stroke long hole, the first movable column passes through the first stroke long hole in the vertical direction, the exposed upper part of the first movable column is connected to the first clamping piece, the lower part of the first movable column is connected to the first motor, and the first motor drives the first movable column to perform horizontal linear motion in the first stroke long hole, that is, the gas injection cylinder member and the gas injection needle perform horizontal linear motion together.

The second end of the gas injection screw extends into the interior of the second fixed shell seat, the bottom of the second fixed shell seat is open and communicated with the interior of the gas injection base shell, the second motor is arranged inside the gas injection base shell, the second motor is directly or indirectly connected to the second end of the gas injection screw and drives the gas injection screw to rotate, and then drives the gas injection movable seat to make horizontal linear motion along the gas injection screw, and the gas injection movable seat clamps the outer end of the gas injection push rod to realize the movement of the gas injection push rod.

Specifically, a clamping gap is provided on the side of the gas injection movable seat facing the gas injection syringe, the top surface of the clamping gap is open and a U-shaped opening is provided towards the side wall of the gas injection syringe, a clip portion is provided at the tail end of the gas injection push rod, the clip portion is inserted and fixed in the clamping gap, and the gas injection push rod and the gas injection movable seat are relatively stationary.

When the gas injection syringe is inserted into or withdrawn from the gas sample storage bottle, the first motor and the second motor are started together to make the gas injection cylinder and the gas injection push rod have the same displacement; when the first motor is turned off and the second motor is started, the gas injection push rod can be driven to slide as needed.

Preferably, two stabilizing rods are fixed between the first fixed shell seat and the second fixed shell seat, the two stabilizing rods are respectively located on both sides of the gas injection screw, the gas injection movable seat is provided with through holes adapted to the two stabilizing rods, and the two stabilizing rods penetrate the gas injection movable seat through the through holes. The motor-driven movement inevitably has vibration problems, and the design of the stabilizing rod makes the horizontal linear movement of the gas injection movable seat more stable, thereby making the movement trajectory of the gas injection needle more accurate, which is convenient for aligning and piercing the gas sample storage bottle.

More preferably, the stabilizing rod located on the same side as the stroke long hole is set as a first stabilizing rod, the end of the first stabilizing rod extends into the interior of the first fixed shell seat, and a first connecting seat is provided at the bottom of the first movable column. The first connecting seat is connected to the first motor and driven by it, and the first connecting seat has a through hole adapted to the first stabilizing rod. The first connecting seat forms a sliding connection with the first stabilizing rod, that is, the first stabilizing rod is not only used to stabilize the movement of the gas injection movable seat, but also used to stabilize the movement of the first movable column.

Preferably, the gas storage module further includes a rotating frame and a first rotating motor.

Several of the gas sample storage bottles are placed on a rotating frame, and the rotating frame is provided with a first rotating motor, which drives the rotating frame to rotate. The rotating frame is provided with several bottle holders for fixing the gas sample storage bottles, and several of the bottle holders are horizontally placed on the rotating frame and are evenly arrayed around the circumference.

The bottle clamp seat includes two arc-shaped clamps arranged opposite to each other. A vertically arranged abutment wall is provided on one side of the bottle clamp seat close to the center of the rotating frame. The gas sample storage bottle is horizontally clamped in the bottle clamp seat. The bottle mouth of the gas sample storage bottle placed on the rotating frame faces the outer peripheral direction, and the bottle body is surrounded and clamped by the two arc-shaped clamps. The bottom of the bottle abuts against the abutment wall to withstand the force applied when the needle pierces the gas sample storage bottle.

As can be seen from the above, the position of the gas sample storage bottle of the present invention is fixed, and the angle of each rotation of the first rotary motor makes one of the gas sample storage bottles align with the gas injection needle or the gas extraction needle described below. Since the needle of the present invention only makes a short horizontal linear motion, the movement deviation is small, and the bottle mouth of the gas sample storage bottle is a soft rubber plug, so the needle does not need to pursue high precision when aligning and piercing the gas sample storage bottle each time.

Preferably, the rotating frame includes a support shaft arranged in the vertical direction and at least one mounting disc, the support shaft passes through the center position of the mounting disc, the support shaft and the mounting disc are relatively stationary, the support shaft is directly or indirectly driven to rotate by the first rotating motor, a plurality of bottle holders are installed on the top surface of the mounting disc, and after the gas sample storage bottle is clamped in the bottle holder, the bottle mouth protrudes outward from the edge of the mounting disc.

More preferably, the mounting disc is provided with at least two, namely, an upper mounting disc and a lower mounting disc, and the two mounting discs are fixed to the supporting shaft and distributed up and down. The bottom of the lower mounting disc is connected and fixed with at least one lifting push rod, the moving rod of the lifting push rod is fixedly connected with the bottom of the lower mounting disc, the fixing seat of the lifting push rod is fixedly installed on a mounting platform, the bottom of the mounting platform is connected and fixed with the first rotating motor, and the lifting push rod drives the upper mounting disc and the lower mounting disc to rise and fall. This design can increase the number of gas samples that can be stored at one time in the present invention.

More preferably, the bottom of the lower mounting disc is provided with a concentric circular slide rail, and the lifting push rods are provided with three and are evenly distributed on the mounting platform. The end of the moving rod of the lifting push rod is slidably engaged with the circumferential slide rail. This design makes the lifting and lowering of the mounting disc more stable and accurate.

Specifically, several of the bottle holders have different number marks (such as sequential marks starting with the number 1 or alphabetical marks starting with the letter A, etc.) and the positions are recorded in the system. Taking the digital labels as an example, when the second gas sample is collected, the rotating frame rotates the bottle holder with the starting number to the injection needle position, and the numbers are rotated and collected in sequence. This design is convenient for recording and searching for corresponding gas samples, and also convenient for subsequent gas mixing operations to form the third gas sample. For example, if the second gas sample with the mixing number 4 and the number 21 is specified, the number 4 and the number 21 can be selected by clicking on the human-computer interaction system. The system controls the rotation of the rotating drive motor and the lifting and lowering of the lifting push rod according to the position record of the bottle holder, and successively aligns the gas sample storage bottles on the bottle holders with the numbers 4 and 21 with the gas extraction needle.

The air extraction module comprises an air extraction drive source and an air extraction syringe.

The gas extraction syringe includes a gas extraction push rod, a gas extraction cylinder component and a gas extraction needle. The gas extraction cylinder component has a gas extraction cylinder cavity for accommodating gas. One side of the gas extraction cylinder cavity is open for the gas extraction push rod to extend and slide in, and the other side of the gas extraction cylinder cavity is fixed and connected to the gas extraction needle. The gas extraction cylinder component and the gas extraction needle remain relatively still.

The gas extraction cylinder has a third connecting pipe and a fourth connecting pipe protruding from the outer surface. The third connecting pipe and the fourth connecting pipe are connected to the gas extraction cylinder cavity and the inner end is flush with the inner surface of the gas extraction cylinder cavity to avoid affecting the sliding movement of the gas extraction push rod. The third connecting pipe is blocked, and the fourth connecting pipe is externally connected to the clean gas supply source. The fourth connecting pipe is arranged near the open end of the cylinder cavity. The clean gas supply source and the fourth connecting pipe are used to introduce clean gas to purge and clean the gas extraction cylinder cavity every time a third gas sample is extracted and produced.

The gas extraction driving source drives the gas extraction syringe to move as a whole to enable the gas extraction needle to penetrate or withdraw and drives the gas extraction push rod to slide in the gas extraction cylinder cavity.

Specifically, the air intake module further includes an air intake base shell, and the air intake drive source includes a third motor and a fourth motor.

A third fixed shell seat and a fourth fixed shell seat are provided on both sides of the top surface of the air intake base shell, and an air intake movable seat and an air intake screw are provided between the third fixed shell seat and the fourth fixed shell seat, and the two ends of the air intake screw are respectively fixed to the third fixed shell seat and the fourth fixed shell seat; the air intake movable seat is provided with a threaded hole adapted to the air intake screw, and the air intake screw is screwed into the threaded hole and passes through the air intake movable seat.

The third fixed shell seat is equipped with a third clamping member for clamping the air extraction cylinder member, the third clamping member and the air extraction cylinder member remain relatively stationary, the third clamping member is installed on the third movable column, the third movable column is directly or indirectly connected to the third motor and driven thereby, the top surface of the third fixed shell seat is provided with a third stroke long hole, the third movable column passes through the third stroke long hole in a vertical direction, the exposed upper part of the third movable column is connected to the third clamping member, the lower part of the third movable column is connected to the third motor, the third motor drives the third movable column to make horizontal linear motion in the third stroke long hole, that is, the air extraction cylinder member and the air extraction needle make horizontal linear motion together.

The second end of the air intake screw extends into the interior of the fourth fixed shell seat, the bottom of the fourth fixed shell seat is open and communicated with the interior of the air intake base shell, the fourth motor is placed inside the air intake base shell, the fourth motor is directly or indirectly connected to the second end of the air intake screw and drives the air intake screw to rotate, and then drives the air intake movable seat to make horizontal linear motion along the air intake screw, and the air intake movable seat clamps the outer end of the air intake push rod to realize the movement of the air intake push rod.

Specifically, a clamping gap is provided on the side of the air extraction movable seat facing the air extraction syringe, the top surface of the clamping gap is open and a U-shaped opening is provided towards the side wall of the air extraction syringe, a clip portion is provided at the tail end of the air extraction push rod, the clip portion is inserted and fixed in the clamping gap, and the air extraction push rod and the air extraction movable seat are relatively stationary.

When the air extraction syringe is inserted or withdrawn, the third motor and the fourth motor are started together to make the air extraction cylinder and the air extraction push rod have the same displacement; when the third motor is turned off and the fourth motor is started, the air extraction push rod can be driven to slide as needed.

Preferably, two stabilizing rods are fixed between the third fixed shell seat and the fourth fixed shell seat, the two stabilizing rods are respectively located on both sides of the air extraction screw rod, the air extraction movable seat is provided with through holes adapted to the two stabilizing rods, and the two stabilizing rods penetrate the air extraction movable seat through the through holes. The motor-driven movement inevitably has vibration problems, and the design of the stabilizing rod makes the horizontal linear movement of the air extraction movable seat more stable, thereby making the movement trajectory of the air extraction needle more accurate, which is convenient for aligning and piercing the gas sample storage bottle.

More preferably, the stabilizing rod located on the same side as the stroke long hole is set as a third stabilizing rod, the end of the third stabilizing rod extends into the interior of the third fixed shell seat, and a third connecting seat is provided at the bottom of the third movable column. The third connecting seat is connected to the third motor and driven by it, and the third connecting seat has a through hole adapted for the third stabilizing rod, and the third connecting seat forms a sliding connection with the third stabilizing rod, that is, the third stabilizing rod is not only used to stabilize the movement of the air extraction movable seat, but also used to stabilize the movement of the third movable column.

Preferably, the gas injection syringe and gas extraction syringe are mirror-symmetrical, and the number of bottle slots on each mounting disc is an even number, which facilitates the design of the rotation interval of the rotating frame so that the gas sample storage bottle is aligned with the gas injection needle or the gas extraction needle in each rotation.

Preferably, a connecting tube is provided between the air extraction module and the olfactory port, and an elastic injection plug is provided at the tube opening of the connecting tube facing the air extraction module for the air extraction needle to pierce, and the other side of the tube opening of the connecting tube is connected to the above-mentioned pipeline structure wrapped with a heating sleeve, and then connected to the olfactory port. The air extraction module injects the extracted gas into the connecting tube, and the gas flows to the olfactory port for the olfactory operator to smell.

The central axis of the connecting tube coincides or substantially coincides with the central axis of the gas extraction syringe, the gas extraction base shell is installed on a rotating platform and is relatively stationary, a second rotating motor is provided at the bottom of the rotating platform to drive the rotating platform to rotate, and a single rotation of the rotating platform is 180°.

Since the pipe structure wrapped with the heating sleeve is relatively heavy and bendable, it is difficult to connect with the needle, so the connecting tube is designed to facilitate the alignment of the needle. The interior of the connecting tube has a trumpet-shaped hollow structure, the elastic injection plug is installed at the wide end, and the structure of the narrow end is the same as the four-way valve interface structure to connect the hollow chromatographic column. The end of the hollow chromatographic column is exposed outside the heating sleeve, and the threaded member and the sealing ring are provided to form a connection and communication with the narrow end.

An outer tube portion is also provided on the outside of the trumpet-shaped hollow structure, and the pipe mouth of the heating sleeve is clamped on the inner side of the outer tube portion to prevent the heating sleeve from being bent too much due to weight or natural falling and thus easily detached from the connecting tube, affecting the olfactory test.

The connecting tube is provided with a stand so that it is at a target height and docked with the gas extraction needle.

Specifically, the internal pipeline of the four-way valve is cross-shaped to form the four interfaces mentioned above, the first interface and the third interface are arranged opposite to each other, and the second interface and the fourth interface are arranged opposite to each other. The function is that the gas sample and the carrier gas input from the first interface and the third interface are first mixed and then output to the second interface and the fourth interface respectively. In practical applications, an air pump, a flow regulating valve, etc. can also be adaptively arranged on the pipeline structure to control the flow of the gas sample.

It can be seen from the above that the gas is transported between the fourth interface and the fifth interface through the gas storage and mixing device.

More preferably, the conduit between the first interface and the gas chromatograph is wrapped with the heating sleeve, and the heating temperature of the heating sleeve is set to at least keep the gas in the conduit in a gaseous state;

The conduit between the second interface and the detector is wrapped with a heating sleeve, and the heating temperature of the heating sleeve is set to at least keep the gas in the conduit in a gaseous state;

A flow regulating valve is provided in the conduit between the third interface and the second carrier gas supply source;

The conduit between the fourth interface and the gas injection module is wrapped with a heating sleeve and provided with a flow regulating valve, and the heating temperature of the heating sleeve is set to at least keep the gas in the conduit in a gaseous state;

The conduit between the fifth interface and the gas extraction module is wrapped with a heating sleeve and provided with a flow regulating valve. The heating temperature of the heating sleeve is set to make the gas in the conduit the same as the ambient temperature of the polluted water area;

The conduit between the sixth interface and the humidification module is wrapped with a heating sleeve and is provided with a flow regulating valve. The heating temperature of the heating sleeve is set to make the gas in the conduit the same as the ambient temperature of the polluted water area.

In practical applications, since the gas chromatograph has its own column oven, the four-way valve and part of the conduit connected thereto can be placed in the column oven of the gas chromatograph, thus reducing the number of heating sleeves to be installed.

The flow regulating valve of the present invention may be an EPC electronic pressure controller, and the flow regulating valve transmits information such as flow rate and pressure to the controller and is controlled by the controller.

In actual applications, the EPC electronic pressure controller may also be equipped with a flow adjustment knob, through which the gas flow can be manually adjusted. The flow adjustment knob can set the gear to off, 1ml/min, 2ml/min, 3ml/min, 4ml/min, 5ml/min, 6ml/min, and the gas flow can also be adjusted through the above-mentioned human-computer interaction module.

Specifically, a connecting screw is provided near the tail end of the hollow chromatographic column as a conduit, a through long hole is provided in the middle of the connecting screw along the length direction, an expansion sealing ring is installed at the end of the threaded section of the connecting screw, and the hollow chromatographic column is inserted from the head of the connecting screw to the tail through the through long hole;

The inner walls of the interfaces of the four-way valve and the three-way valve are provided with internal threads adapted to the connecting screws. The inner wall of the heated expansion sealing ring contacts the outer wall of the hollow chromatographic column, and the outer wall contacts the inner wall of the internal passage of the three-way valve or the four-way valve. The end of the hollow chromatographic column is exposed 2 to 4 mm inside the three-way valve or the four-way valve.

More specifically, the expansion seal ring is formed by pressing a homogenous mixture of 85wt% polyimide and 15wt% graphite, or can be made of a plastic metal material. The expansion seal ring expands slightly when heated, thereby achieving the above-mentioned sealing contact to prevent gas leakage.

The three-way valve and the four-way valve are made of stainless steel. The chromatographic column has a length of 15, 30, 60 m, etc. The separation chromatographic column also has different liquid film thicknesses, diameters, etc., and those skilled in the art can select as needed according to actual conditions.

The main operation process of the system of the present invention is as follows:

(1) The odorous water sample or/and odorous gas sample after pretreatment enters the gas chromatograph, and at the same time, a carrier gas is introduced through the first carrier gas supply source to mix with the sample to form an unseparated gas sample. The substances in the unseparated gas sample are separated in sequence through the gas chromatograph to generate a plurality of first gas samples. The first gas sample enters the four-way valve through the first interface; at the same time, the carrier gas delivered by the second carrier gas supply source enters the four-way valve through the third interface. The first gas sample and the carrier gas are counteracted and mixed in the four-way valve, and then flow to the detector and the gas injection module through the second interface and the fourth interface of the four-way valve respectively.

(2) Collection of a single second gas sample: The system pre-sets a unit time period, and the starting position of the inner end of the gas injection push rod is set between the first connecting pipe and the second connecting pipe. The inner pipe opening of the first connecting pipe is exposed to the inner cavity of the gas injection cylinder, so that the gas can enter the cylinder cavity. The inner pipe opening of the second connecting pipe is blocked by the gas injection push rod and is not exposed to the inner cavity of the gas injection cylinder, so as to prevent the gas entering the cylinder cavity from flowing out through the second connecting pipe.

The gas storage module rotates the mouth of the gas sample storage bottle corresponding to the starting number to align with the gas injection needle, and the first motor and the second motor are started to indirectly drive the gas injection needle of the gas injection syringe to penetrate into the gas sample storage bottle. After a unit time period, the first motor drives the gas injection push rod to advance in the direction of the gas injection needle, and the gas in the gas injection cylinder is injected into the gas sample storage bottle to form a second gas sample.

(3) The first motor and the second motor are started to indirectly drive the gas injection syringe to withdraw from the gas sample storage bottle that has been injected with gas, and the first motor then drives the gas injection push rod to slide in a direction away from the gas injection needle until the inner tube opening of the second connecting pipe is exposed in the cylinder cavity of the gas injection cylinder;

The cleaning gas supply source repeatedly pumps or draws cleaning gas into the cylinder cavity through the second connecting pipe, and the cleaning gas purges and cleans the cylinder cavity. After the cylinder cavity is cleaned, the first motor is started to indirectly drive the gas injection push rod to reset, that is, the gas injection push rod is reset to between the first connecting pipe and the second connecting pipe;

(4) The gas storage module starts the first rotating motor to indirectly drive the rotating frame to rotate so that the next gas sample storage bottle that has not been injected with gas sample is aligned with the gas injection needle;

(5) repeating steps (2) to (4) until the gas chromatograph completes the separation of the unseparated gas sample and collects a plurality of second gas samples;

(6) The starting position of the gas extraction push rod is set so that the inner end of the gas extraction push rod is located closest to the gas extraction needle, and the gas extraction procedure starts. The gas storage module rotates the mouth of the gas sample storage bottle corresponding to the starting number and having collected the second gas sample to align with the gas extraction needle;

(7) The third motor and the fourth motor are started to indirectly drive the gas extraction needle of the gas extraction syringe to penetrate into the gas sample storage bottle, and the third motor then drives the gas extraction push rod to slide away from the gas extraction needle. The inner end of the gas extraction push rod does not exceed the fourth connecting pipe, causing the fourth connecting pipe to be exposed in the cylinder cavity of the gas extraction cylinder, thereby preventing the extracted second gas sample from entering the fourth connecting pipe and flowing out. The second gas sample is extracted into the gas extraction cylinder;

(8) The heating sleeve between the connecting tube and the handheld box has been preheated to the ambient temperature of the polluted water area or the refrigeration component in the handheld box has been precooled to the ambient temperature of the polluted water area, and at the same time, the humidification module starts to deliver humidified air to the three-way valve;

The third motor and the fourth motor are started, indirectly driving the gas extraction syringe to withdraw from the gas sample storage bottle, the rotating platform rotates 180 degrees, the gas extraction needle is aligned with the elastic injection plug of the connecting tube, the third motor and the fourth motor are started, indirectly driving the gas extraction syringe to penetrate the connecting tube, the third motor indirectly drives the gas extraction push rod to slide in the direction of the gas extraction needle, the gas in the gas extraction cylinder is injected into the connecting tube, and then after heating or cooling, mixed with humid air, it finally flows to the sniffing port for the olfactory to smell;

(9) The rotating platform rotates another 180°, and the third motor drives the gas extraction push rod to slide in a direction away from the gas extraction needle until the inner tube opening of the fourth connecting pipe is exposed in the cylinder cavity of the gas extraction cylinder;

The cleaning gas supply source repeatedly pumps or draws cleaning gas into the cylinder cavity through the fourth connecting pipe, and the cleaning gas purges and cleans the cylinder cavity. After the cylinder cavity is cleaned, the third motor is started to indirectly drive the gas extraction push rod to reset, that is, the gas extraction push rod is reset to the position where the inner end of the gas extraction push rod is closest to the gas extraction needle;

(10) The gas storage module starts the first rotating motor to indirectly drive the rotating frame to rotate so that the next numbered gas sample storage bottle is aligned with the gas extraction needle;

(11) repeating steps (7) to (10) until the second gas sample is successively delivered to the olfactory port;

If the second gas sample does not have an odor that is substantially the same or identical to that of the contaminated waters, proceed to the next step;

(12) Gas mixing operation of the third gas sample: the gas storage module sequentially aligns the gas sample storage bottle with the gas extraction needle in an arrangement and combination manner, or the gas storage module sequentially aligns the gas sample storage bottle with the corresponding number with the gas extraction needle according to the number combination designated by the olfactory personnel or the testing personnel. The number of the second gas samples mixed in a single portion of the third gas sample is the number of times the gas extraction syringe repeats the "insertion-extraction-exit" action. More than one portion of the second gas sample is mixed in the gas extraction syringe to form a single portion of the third gas sample, and then steps (8) and (9) are executed until the preset third gas sample is sniffed and the olfactory personnel determine the odorous substances in the polluted waters.

Alternatively, each time a single third gas sample is formed, the gas extraction syringe is first injected into a blank gas sample storage bottle until the preset second gas sample combination is completed, and then the formed several third gas samples are successively extracted from the gas sample storage bottle and injected into the connecting tube, and steps (8) and (9) are executed, and the olfactory staff determines the odorous substances in the polluted water area.

It should be noted that in actual applications, the first sniff is to restore the temperature, humidity and air composition of the scene as much as possible. After sniffing, the sniffer can also adjust the temperature and humidity according to experience. In essence, as long as the odorous substances can be identified, it has high flexibility.

The system of the present invention also records the olfactory concentration warning values of various substances to ensure the life and health of the olfactory personnel.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a structure of the present invention;

FIG2 is a schematic diagram of a combined structure of a four-way valve and a hollow chromatographic column according to the present invention;

FIG3 is a second schematic diagram of the combined structure of the four-way valve and the hollow chromatographic column of the present invention;

FIG4 is a schematic diagram of a combined structure of a three-way valve and a hollow chromatographic column according to the present invention;

FIG5 is a second schematic diagram of the combined structure of the three-way valve and the hollow chromatographic column of the present invention;

FIG6 is a schematic diagram of the sheathing structure of the heating sleeve and the hollow chromatographic column of the present invention;

FIG7 is a schematic diagram of the structure of the interior of the handheld box and the sniffing port of the present invention;

FIG8 is a schematic diagram of the structure of a humidification module of the present invention;

FIG9 is a second structural schematic diagram of the humidification module of the present invention;

FIG10 is a second schematic diagram of the structure of the present invention (part of the equipment is omitted);

FIG11 is a schematic diagram of the structure of the gas injection module of the present invention;

FIG12 is a second schematic diagram of the structure of the gas injection module of the present invention;

FIG13 is a schematic structural diagram of a gas storage module of the present invention;

14 is a schematic diagram of the combined structure of the gas sample storage bottle, the bottle holder and the upper mounting disc of the present invention;

FIG15 is a schematic diagram of the structure of the air extraction module of the present invention;

FIG16 is a second structural schematic diagram of the air extraction module of the present invention;

FIG. 17 is a schematic diagram of the combined structure of the connecting tube, the hollow chromatographic column and the heating sleeve of the present invention.

Reference numerals

A, first carrier gas supply source; B, gas chromatograph; C, second carrier gas supply source; D, detector; E, gas injection module; F, gas storage module; G, gas extraction module; H, dry air supply source; I, humidification module; J, refrigeration component; K, heating sleeve; L, human-computer interaction module;

1. Four-way valve; 101. First interface; 102. Second interface; 103. Third interface; 104. Fourth interface;

2. Connecting screws; 201. Expansion seal ring;

3. Hollow chromatographic column;

4. Three-way valve; 405. Fifth interface; 406. Sixth interface; 407. Seventh interface;

5. Bendable copper tube; 6. Resistance heating wire; 7. Insulation cotton; 55. Temperature sensor;

8. Handheld box;

9. Semiconductor refrigeration chip; 10. Refrigeration cavity; 11. Sniffing port; 12. Cooling sensor;

13. Air inlet pipe; 14. Humidification bottle; 15. Air outlet pipe; 16. Porous wetted parts; 17. Housing; 18. Air inlet port; 19. Moisture outlet port;

20. Gas injection base shell; 21. Second fixed shell seat; 22. Gas injection screw rod; 23. First stabilizing rod; 24. Gas injection movable seat; 2401. Clamping slit; 25. Gas injection push rod; 26. First clamping member; 27. First fixed shell seat; 2701. First stroke long hole; 28. Gas injection cylinder member; 2801. First connecting pipe; 2802. Second connecting pipe; 29. First movable column; 30. First connecting seat; 31. First motor;

32. Gas sample storage bottle; 33. Bottle holder; 3301. Arc clamp; 3302. Wall-abutting; 34. Support shaft; 35. Upper mounting disc; 36. Lower mounting disc; 37. Lifting push rod; 38. Mounting platform; 39. First rotating motor;

40. Gas extraction base shell; 41. Third fixed shell seat; 4101. Third stroke long hole; 42. Gas extraction cylinder; 4201. Fourth pipe 4201; 43. Third clamping member; 44. Gas extraction push rod; 45. Gas extraction moving seat; 46. Third stabilizing rod; 47. Gas extraction screw rod; 48. Fourth fixed shell seat; 49. Rotating platform; 50. Second rotating motor; 51. Third motor; 52. Third connecting seat; 53. Third moving column;

54, connecting tube; 5401, outer tube part;

55. Temperature sensor;

56. Flow control valve.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiment is only one of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

1 to 17 , the system used in this embodiment includes a gas chromatograph B, a detector D, a controller, a first carrier gas supply source A, a second carrier gas supply source C, a dry air supply source H, a temperature control module, a humidification module I, a sniffing port 11 and a pipeline structure.

The output end of the first carrier gas supply source A is connected to the gas chromatograph B.

The gas chromatograph B includes a separation chromatographic column with a coating. The output end of the gas chromatograph B and the output end of the second carrier gas supply source C are connected and collected through a pipeline structure, and then directly or indirectly connected to the input end of the detector D and the input end of the sniffing port 11 through the pipeline structure.

The output end of the dry air supply source H is connected to the input end of the humidification module I, and the output end of the humidification module I is also connected to the input end of the sniffing port 11.

The temperature control module is provided at least near the input end of the sniffing port 11 to heat or cool the gas in the pipeline.

In this embodiment, the controller is connected to a human-computer interaction module L, and the human-computer interaction module L is a display screen, a keyboard, a mouse, etc. connected to the controller.

In this embodiment, the detector D is a mass spectrometer MS. The unit mass analyzer type of the mass spectrometer MS used in this embodiment is a quadrupole, which is a scanning instrument that only allows ions of a specific m/z to pass through the quadrupole in a stable trajectory to reach the ion detector by changing the voltage. The working mode of the quadrupole instrument: Full scan mode: The full scan (SCAN) mode obtains all ions within a certain mass range, which is suitable for the identification of unknown substances, method development, and qualitative and quantitative analysis of high-concentration analytes.

The first carrier gas supply source A and the second carrier gas supply source C are commercially available gas cylinders storing helium.

The dry air supply source H is a commercially available gas cylinder storing dry air.

In this embodiment, the pipeline structure includes a four-way valve 1, a three-way valve 4 and a plurality of conduits.

The four interfaces of the four-way valve 1 are set as a first interface 101 , a second interface 102 , a third interface 103 and a fourth interface 104 , and the three interfaces of the three-way valve 4 are set as a fifth interface 405 , a sixth interface 406 and a seventh interface 407 .

The first interface 101 is directly or indirectly connected to the gas output end of the gas chromatograph B through a conduit, and the conduit is wrapped with the following heating sleeve K. The heating temperature of the heating sleeve K is set to at least keep the gas in the conduit in a gaseous state (25° C.).

The second interface 102 is directly or indirectly connected to the input end of the detector D through a conduit. The conduit is wrapped with a heating sleeve K. The heating temperature of the heating sleeve K is set to at least keep the gas in the conduit in a gaseous state (25° C.).

The third interface 103 is directly or indirectly connected to the output end of the second carrier gas supply source C through a conduit and is provided with a flow regulating valve 56 .

A gas storage and mixing device is provided between the fourth interface 104 of the four-way valve 1 and the fifth interface 405 of the three-way valve 4 to transport, store and mix gas, and the gas storage and mixing device includes a gas injection module E, a gas storage module F and a gas extraction module G;

The fourth interface 104 and the gas injection module E are connected by a conduit and wrapped with a heating sleeve K, and a flow regulating valve 56 is provided. The heating temperature of the heating sleeve K is set to at least keep the gas in the conduit in a gaseous state (25° C.);

The fifth interface 405 and the gas extraction module G are connected by a conduit wrapped with a heating sleeve K, and a flow regulating valve 56 is provided. The heating temperature of the heating sleeve K is set to make the gas in the conduit the same as the ambient temperature of the polluted water area (31°C);

A conduit is connected between the sixth interface 406 and the humidification module I and is wrapped with a heating sleeve K. A flow regulating valve 56 is also provided. The heating temperature of the heating sleeve K is set to make the gas in the conduit the same as the ambient temperature of the polluted water area (31° C.).

The seventh interface 407 of the three-way valve 4 is directly or indirectly connected to the input end of the sniffing port 11 .

Specifically, the internal pipeline of the four-way valve 1 is cross-shaped to form the four interfaces mentioned above, the first interface 101 and the third interface 103 are arranged opposite to each other, and the second interface 102 and the fourth interface 104 are arranged opposite to each other.

Specifically, the conduit is a hollow chromatography column 3 without a coating.

Specifically, a connecting screw 2 is provided near the tail end of the hollow chromatographic column 3 serving as a conduit, a through long hole is provided in the middle of the connecting screw 2 along the length direction, an expansion sealing ring 201 is installed at the end of the threaded section of the connecting screw 2, and the hollow chromatographic column 3 is inserted from the head of the connecting screw 2 to the tail through the through long hole;

The inner walls of the interfaces of the four-way valve 1 and the three-way valve 4 are provided with internal threads adapted to the connecting screws 2. After being heated, the inner wall of the expansion sealing ring 201 contacts the outer wall of the hollow chromatographic column 3, and the outer wall contacts the inner wall of the internal passage of the three-way valve 4 or the four-way valve 1. The end of the hollow chromatographic column 3 is exposed 3 mm inside the three-way valve 4 or the four-way valve 1.

More specifically, the expansion seal ring 201 is formed by homogenizing and pressing 85 wt % polyimide and 15 wt % graphite. The expansion seal ring 201 will expand slightly after being heated, thereby achieving the above-mentioned sealing contact to prevent gas leakage.

The three-way valve 4 and the four-way valve 1 are made of stainless steel. The chromatographic column has a length of 15, 30, 60 m, etc., and the separation chromatographic column also has different liquid film thicknesses, diameters, etc., and those skilled in the art can select as needed according to actual conditions.

In this embodiment, the humidification module I includes a flow regulating valve 56, a humidification bottle 14, an input air pipe 13, an output air pipe 15, an air input port 18 and a moisture output port 19.

The air input port 18 is connected to the output end of the dry air supply source H and the input end of the input air pipe 13 respectively. A flow regulating valve 56 is provided between the air input port and the dry air supply source H. The output end of the input air pipe 13 extends below the liquid level of the humidification bottle 14. The input end of the output air pipe 15 extends into the humidification bottle 14 and is located above the liquid level. The humidification bottle 14 is filled with pure water. A certain space is reserved between the pure water liquid level and the bottle mouth to accommodate humidified air.

The output end of the output air pipe 15 is connected to the moisture output port 19 , and the moisture output port 19 is directly or indirectly connected to the sniffing port 11 .

A porous wetting member 16 (sponge) is installed at the output end of the input air pipe 13. The porous wetting member 16 is located below the liquid level of the humidifying bottle 14. After the dry air is poured into the porous wetting member 16, it is dispersed and then fully moistened. It then escapes upward to above the liquid level and is output from the output air pipe 15.

Specifically, the input air pipe 13 and the output air pipe 15 are made of polytetrafluoroethylene material. The humidification bottle 14 includes a bottle body and a bottle cap, the bottle body is made of transparent glass, the bottle cap is made of PP hard plastic, a Teflon gasket is provided on the inner side of the bottle cap, and the bottle cap is provided with two through holes for the input air pipe 13 and the output air pipe 15 to pass through, and the input air pipe 13 and the output air pipe 15 are stuck in the through holes and form a sealed contact to avoid air leakage.

The humidification module I also includes a housing 17, and a flow adjustment knob is provided on the outside of the housing 17. The flow adjustment knob sets the gear to 1 ml/min, 2 ml/min, 3 ml/min, 4 ml/min, 5 ml/min, and 6 ml/min, and the gas flow rate can also be adjusted through the above-mentioned human-computer interaction module L. The flow rate used in the test of this embodiment is 5 ml/min.

The housing 17 is provided with the air input port 18, the moisture output port 19 and the fixing clamp of the humidifying bottle 14, and is also adaptively provided with a through hole for the water supply pipe to pass through, a switch or other conventional components.

In this embodiment, the temperature control module has a heating gas function and a cooling gas function, and the opening or closing of each function of the temperature control module and the adjustment of the temperature are controlled by a controller.

The temperature control module includes a heating sleeve K and a refrigeration component J.

The heating sleeve K comprises a bendable copper tube 5 , a resistance heating wire 6 , a heat preservation cotton 7 and a temperature rise sensor 55 .

The outer circumference of the catheter wrapped with the heating sleeve K is wrapped with the flexible copper tube 5, the resistance heating wire 6 and the thermal insulation cotton 7 in sequence. The resistance heating wire 6 generates heat to conduct heat to the flexible copper tube 5, and the flexible copper tube 5 conducts heat to the pipeline structure, thereby heating the gas sample; the temperature rise sensor 55 monitors the temperature of the resistance heating wire 6 and transmits the temperature information to the controller.

The refrigeration component J includes a refrigeration cavity 10 for accommodating gas, a semiconductor refrigeration sheet 9 and a temperature reduction sensor 12 . The refrigeration component J is arranged between the seventh interface 407 of the three-way valve 4 and the sniffing port 11 .

The refrigeration cavity 10 has an inlet and an outlet, the inlet is connected to the seventh interface 407 of the three-way valve 4, and the outlet is connected to the input end of the olfactory port 11; the semiconductor refrigeration plate 9 cools the gas in the refrigeration cavity 10 to a specified temperature (i.e., the ambient temperature of the polluted water area), and the cooling sensor 12 monitors the temperature inside the refrigeration cavity 10.

Since the sniffing and sampling are performed in summer in this embodiment, the refrigeration component J of this embodiment remains in a closed state, and only the gas is allowed to pass into the sniffing port 11.

In this embodiment, the sniffing port 11 is a trumpet-shaped structure with a narrow opening and a wide opening. The outer contour of the wide opening fits the shape of the nose, and the narrow opening can be detachably mounted on the side of a handheld box 8.

Specifically, the refrigeration assembly J is arranged on one side of the inside of the handheld box 8 close to the sniffing port 11, the semiconductor refrigeration sheet 9 is installed on the top of the refrigeration cavity 10, and the temperature reduction sensor 12 is installed on the bottom of the refrigeration cavity 10;

The three-way valve 4 is installed and fixed on the other side, the fifth interface 405 of the three-way valve 4 is connected to the pipeline structure wrapped with the heating sleeve K, the sixth interface 406 of the three-way valve 4 is connected to the output end of the humidification module I, and the seventh interface 407 of the three-way valve 4 is connected to the inlet of the refrigeration cavity 10.

The handheld box 8 is provided with two through openings on the opposite side of the sniffing port 11 for the passage of the pipeline.

The narrow opening and the hand-held box 8 are mounted in a snap-fit manner, and can be installed and removed by rotating.

The gas injection module E includes a gas injection drive source and a gas injection syringe, and the gas storage module F includes 48 gas sample storage bottles 32, and the gas sample storage bottles 32 are used to store the second gas sample or the gas sample storage bottles 32 are used to store the second gas sample and the third gas sample.

The gas injection syringe includes a gas injection push rod 25, a gas injection cylinder component 28 and a gas injection needle. The interior of the gas injection cylinder component 28 has a gas injection cylinder cavity for accommodating gas. One side of the gas injection cylinder cavity is open to allow the gas injection push rod 25 to slide in, and the other side of the gas injection cylinder cavity is fixed and connected to the gas injection needle. The gas injection cylinder component 28 and the gas injection needle remain relatively still.

The gas injection cylinder 28 has a first connecting pipe 2801 protruding from the outer surface. The first connecting pipe 2801 is connected to the gas injection cylinder cavity. The inner end of the first connecting pipe 2801 is flush with the inner surface of the gas injection cylinder cavity to avoid affecting the sliding movement of the gas injection push rod 25.

The gas injection driving source drives the gas injection syringe to move as a whole so that the gas injection needle can penetrate into or withdraw from the gas sample storage bottle 32 and drives the gas injection push rod 25 to slide in the gas injection cylinder cavity.

The first connecting pipe 2801 is externally connected to the fourth interface 104, collects gas according to a preset unit time period and then injects it into the gas sample storage bottle 32 to form a second gas sample.

In this embodiment, the gas injection cylinder 28 also has a second connecting pipe 2802 protruding from the outer surface. The structure of the second connecting pipe 2802 is the same as that of the first connecting pipe 2801. The second connecting pipe 2802 is externally connected to a clean gas supply source. The first connecting pipe 2801 is arranged near the gas injection needle, and the second connecting pipe 2802 is arranged near the open end of the cylinder cavity. The clean gas supply source and the second connecting pipe 2802 are used to introduce clean gas to purge and clean the gas injection cylinder cavity every time a second gas sample is delivered to the gas sample storage bottle 32. The clean gas supply source is a gas cylinder storing nitrogen.

Specifically, the gas injection module E further includes a gas injection base shell 20, and the gas injection driving source includes a first motor 31 and a second motor.

A first fixed shell seat 27 and a second fixed shell seat 21 are provided on both sides of the top surface of the gas injection base shell 20, and a gas injection movable seat 24 and a gas injection screw 22 are provided between the first fixed shell seat 27 and the second fixed shell seat 21, and the two ends of the gas injection screw 22 are respectively fixed to the first fixed shell seat 27 and the second fixed shell seat 21; the gas injection movable seat 24 is provided with a threaded hole adapted to the gas injection screw 22, and the gas injection screw 22 is screwed into the threaded hole and passes through the gas injection movable seat 24.

The first fixed shell seat 27 is equipped with a first clamping member 26 for clamping the gas injection cylinder 28. The first clamping member 26 and the gas injection cylinder 28 remain relatively stationary. The first clamping member 26 is installed on the first movable column 29. The first movable column 29 is directly or indirectly connected to the first motor 31 and driven by it. The top surface of the first fixed shell seat 27 is provided with a first stroke long hole 2701. The first movable column 29 passes through the first stroke long hole 2701 in the vertical direction. The exposed upper part of the first movable column 29 is connected to the first clamping member 26, and the lower part of the first movable column 29 is connected to the first motor 31. The first motor 31 drives the first movable column 29 to make horizontal linear motion in the first stroke long hole 2701, that is, the gas injection cylinder 28 and the gas injection needle make horizontal linear motion together.

The second end of the gas injection screw 22 extends into the interior of the second fixed shell seat 21, the bottom of the second fixed shell seat 21 is open and communicated with the interior of the gas injection base shell 20, and the second motor is arranged inside the gas injection base shell 20. The second motor is directly or indirectly connected to the second end of the gas injection screw 22 and drives the gas injection screw 22 to rotate, thereby driving the gas injection movable seat 24 to make horizontal linear motion along the gas injection screw 22, and the gas injection movable seat 24 clamps the outer end of the gas injection push rod 25 to realize the movement of the gas injection push rod 25.

Specifically, a clamping slot 2401 is provided on the side of the gas injection movable seat 24 facing the gas injection syringe, the top surface of the clamping slot 2401 is open and a U-shaped opening is provided on the side wall facing the gas injection syringe, and a clip portion is provided at the tail end of the gas injection push rod 25, which is inserted and fixed in the clamping slot 2401, and the gas injection push rod and the gas injection movable seat 24 are relatively stationary.

When the gas injection syringe is inserted into or withdrawn from the gas sample storage bottle 32, the first motor 31 and the second motor are started together to make the gas injection cylinder 28 and the gas injection push rod 25 have the same displacement; when the first motor 31 is turned off, the second motor is started to drive the gas injection push rod 25 to slide as needed.

In this embodiment, two stabilizing rods are fixed between the first fixed housing seat 27 and the second fixed housing seat 21, and the two stabilizing rods are respectively located on both sides of the gas injection screw rod 22. The gas injection movable seat 24 is provided with through holes adapted to the two stabilizing rods, and the two stabilizing rods pass through the gas injection movable seat 24 through the through holes. The motor-driven movement inevitably has vibration problems, and the design of the stabilizing rod makes the horizontal linear movement of the gas injection movable seat 24 more stable, thereby making the movement trajectory of the gas injection needle more accurate, which is convenient for aligning and piercing the gas sample storage bottle 32.

In this embodiment, the stabilizing rod located on the same side as the stroke long hole is set as a first stabilizing rod 23, and the end of the first stabilizing rod 23 extends into the interior of the first fixed shell seat 27. A first connecting seat 30 is provided at the bottom of the first movable column 29. The first connecting seat 30 is connected to the first motor 31 and driven by it. The first connecting seat 30 has a through hole adapted to the first stabilizing rod 23. The first connecting seat 30 forms a sliding connection with the first stabilizing rod 23, that is, the first stabilizing rod 23 is not only used to stabilize the movement of the gas injection movable seat 24, but also used to stabilize the movement of the first movable column 29.

In this embodiment, the gas storage module F further includes a rotating frame and a first rotating motor 39 .

The 48 gas sample storage bottles 32 are placed on a rotating frame, and the rotating frame is provided with a first rotating motor 39, which drives the rotating frame to rotate. The rotating frame is provided with 48 bottle clamps 33 for fixing the gas sample storage bottles 32, and a plurality of the bottle clamps 33 are horizontally placed on the rotating frame and are evenly arrayed around the circumference.

The bottle holder 33 includes two arc-shaped clamps 3301 arranged opposite to each other. A vertically arranged abutment wall 3302 is provided on one side of the bottle holder 33 close to the center of the rotating frame. The gas sample storage bottle 32 is horizontally clamped in the bottle holder 33. The mouth of the gas sample storage bottle 32 placed on the rotating frame faces the peripheral direction. The bottle body is surrounded and clamped by the two arc-shaped clamps 3301, and the bottom of the bottle abuts against the abutment wall 3302 to withstand the force when the needle pierces the gas sample storage bottle 32.

In this embodiment, the rotating frame includes a support shaft 34 arranged along the vertical direction and two mounting discs, the two mounting discs are configured as an upper mounting disc 35 and a lower mounting disc 36, and the two mounting discs are fixed to the support shaft 34 and distributed up and down.

The support shaft 34 passes through the center position of the mounting disc. The support shaft 34 and the mounting disc are relatively stationary. The support shaft 34 is driven to rotate directly or indirectly by the first rotating motor 39. The top surfaces of the upper mounting disc 35 and the lower mounting disc 36 are respectively installed with 24 bottle holders 33. After the gas sample storage bottle 32 is clamped in the bottle holder 33, the bottle mouth protrudes outward from the edge of the mounting disc.

The bottom of the lower mounting disc is provided with a concentric circumferential slide rail, and the lifting push rod 37 is provided with three and is evenly distributed on the mounting platform 38. The end of the moving rod of the lifting push rod 37 is slidably engaged with the circumferential slide rail, and the fixed seat of the lifting push rod 37 is installed and fixed on a mounting platform 38. The bottom of the mounting platform 38 is connected and fixed with the first rotating motor 39, and the lifting push rod 37 drives the upper mounting disc 35 and the lower mounting disc 36 to rise and fall.

Specifically, the 48 bottle holders 33 are numbered 1 to 48, and their positions are recorded in the system.

When the second gas sample is collected, the rotating frame rotates the bottle holder 33 numbered 1 to the position of the gas injection needle, sets the angle of each rotation to 15°, and collects the gas samples in sequence. This design facilitates recording and searching for the corresponding gas sample, and also facilitates the subsequent gas mixing operation to form the third gas sample. For example, if the second gas sample numbered 4 and 21 is specified to be mixed, the human-computer interaction system can be used to click and select numbered 4 and 21. The system controls the rotation of the rotating drive motor and the lifting and lowering of the lifting push rod 37 according to the position record of the bottle holder 33, and successively aligns the gas sample storage bottles 32 on the bottle holders 33 numbered 4 and 21 with the gas extraction needle.

Specifically, the mouth of the gas sample storage bottle 32 is provided with an elastic injection rubber plug for the needle to pierce, and the elastic injection rubber plug seals itself after the needle exits the gas sample storage bottle 32.

The air extraction module G includes an air extraction drive source and an air extraction syringe.

The gas extraction syringe includes a gas extraction push rod 44, a gas extraction cylinder part 42 and a gas extraction needle. The interior of the gas extraction cylinder part 42 has a gas extraction cylinder cavity for accommodating gas. One side of the gas extraction cylinder cavity is open for the gas extraction push rod 44 to extend and slide in, and the other side of the gas extraction cylinder cavity is fixed and connected to the gas extraction needle. The gas extraction cylinder part 42 and the gas extraction needle remain relatively still.

The gas extraction cylinder 42 has a third connecting pipe and a fourth connecting pipe 4201 protruding from the outer surface. The third connecting pipe and the fourth connecting pipe 4201 are connected to the gas extraction cylinder cavity and the inner ends are flush with the inner surface of the gas extraction cylinder cavity to avoid affecting the sliding movement of the gas extraction push rod 44. The third connecting pipe is blocked, and the fourth connecting pipe 4201 is externally connected to the clean gas supply source, and the fourth connecting pipe 4201 is arranged near the open end of the cylinder cavity. The clean gas supply source and the fourth connecting pipe 4201 are used to introduce clean gas to purge and clean the gas extraction cylinder cavity every time a third gas sample is extracted and manufactured.

The gas extraction driving source drives the gas extraction syringe to move as a whole to enable the gas extraction needle to penetrate or withdraw and drives the gas extraction push rod 44 to slide in the gas extraction cylinder cavity.

Specifically, the air intake module G further includes an air intake base shell 40, and the air intake driving source includes a third motor 51 and a fourth motor.

A third fixed shell seat 41 and a fourth fixed shell seat 48 are provided on both sides of the top surface of the air intake base shell 40, and an air intake movable seat 45 and an air intake screw rod 47 are provided between the third fixed shell seat 41 and the fourth fixed shell seat 48, and the two ends of the air intake screw rod 47 are respectively fixed to the third fixed shell seat 41 and the fourth fixed shell seat 48; the air intake movable seat 45 is provided with a threaded hole adapted to the air intake screw rod 47, and the air intake screw rod 47 is screwed into the threaded hole and passes through the air intake movable seat 45.

The third fixed shell seat 41 is equipped with a third clamping member 43 for clamping the air extraction cylinder member 42, and the third clamping member 43 and the air extraction cylinder member 42 remain relatively stationary. The third clamping member 43 is installed on the third movable column 53, and the third movable column 53 is directly or indirectly connected to the third motor 51 and driven thereby. A third stroke long hole 4101 is provided on the top surface of the third fixed shell seat 41, and the third movable column 53 passes through the third stroke long hole 4101 in the vertical direction. The exposed upper part of the third movable column 53 is connected to the third clamping member 43, and the lower part of the third movable column 53 is connected to the third motor 51. The third motor 51 drives the third movable column 53 to make horizontal linear motion in the third stroke long hole 4101, that is, the air extraction cylinder member 42 and the air extraction needle make horizontal linear motion together.

The second end of the air intake screw rod 47 extends into the interior of the fourth fixed shell seat 48, the bottom of the fourth fixed shell seat 48 is open and communicates with the interior of the air intake base shell 40, and the fourth motor is placed inside the air intake base shell 40. The fourth motor is directly or indirectly connected to the second end of the air intake screw rod 47 and drives the air intake screw rod 47 to rotate, thereby driving the air intake movable seat 45 to make horizontal linear motion along the air intake screw rod 47, and the air intake movable seat 45 clamps the outer end of the air intake push rod 44 to realize the movement of the air intake push rod 44.

Specifically, the air extraction movable seat 45 is provided with a clamping gap on the side facing the air extraction syringe, the top surface of the clamping gap is open and a U-shaped opening is opened towards the side wall of the air extraction syringe, the tail end of the air extraction push rod 44 is provided with a clip part, the clip part is inserted and fixed in the clamping gap, and the air extraction push rod and the air extraction movable seat 45 are relatively stationary.

When the air extraction syringe is inserted or withdrawn, the third motor 51 and the fourth motor are started together to make the air extraction cylinder 42 and the air extraction push rod 44 have the same displacement; when the third motor 51 is turned off and the fourth motor is started, the air extraction push rod 44 can be driven to slide as needed.

In this embodiment, two stabilizing rods are fixed between the third fixed shell seat 41 and the fourth fixed shell seat 48. The two stabilizing rods are respectively located on both sides of the air intake screw rod 47. The air intake movable seat 45 is provided with through holes adapted to the two stabilizing rods. The two stabilizing rods pass through the air intake movable seat 45 through the through holes.

In this embodiment, the stabilizing rod located on the same side as the stroke long hole is set as a third stabilizing rod 46, and the end of the third stabilizing rod 46 extends into the interior of the third fixed shell seat 41. The bottom of the third movable column 53 is provided with a third connecting seat 52, and the third connecting seat 52 is connected to the third motor 51 and driven by it. The third connecting seat 52 has a through hole adapted to the third stabilizing rod 46, and the third connecting seat 52 forms a sliding connection with the third stabilizing rod 46, that is, the third stabilizing rod 46 is not only used to stabilize the movement of the air extraction movable seat 45, but also used to stabilize the movement of the third movable column 53.

The gas injection syringe and the gas extraction syringe are mirror-symmetrical.

In this embodiment, a connecting tube 54 is provided between the fifth interface 405 and the air extraction module G. The connecting tube 54 is provided with an elastic injection plug at the tube opening facing the air extraction module G for the air extraction needle to penetrate. The other side tube opening of the connecting tube 54 is connected to the fifth interface 405 via a conduit and is wrapped with a heating sleeve K, and is indirectly connected to the olfactory port 11. The air extraction module G injects the extracted gas into the connecting tube 54, and the gas flows to the olfactory port 11 for the olfactory operator to smell.

The central axis of the connecting tube 54 coincides or substantially coincides with the central axis of the air extraction syringe. The air extraction base shell 40 is installed on a rotating platform 49 and is relatively stationary. A second rotating motor 50 is provided at the bottom of the rotating platform 49 to drive the rotating platform 49 to rotate. A single rotation of the rotating platform 49 is 180°.

Specifically, the interior of the connecting tube 54 has a trumpet-shaped hollow structure, the elastic injection plug is installed at the wide end, the structure of the narrow end is the same as the interface structure of the four-way valve 1 to connect the hollow chromatographic column 3, the end of the hollow chromatographic column 3 is exposed outside the heating sleeve K, and is provided with the threaded member and the sealing ring to form a connection and communication with the narrow end. Other positions that need to be connected and communicated with the hollow chromatographic column are similar.

An outer tube portion 5401 is also provided on the outside of the trumpet-shaped hollow structure, and the pipe mouth of the heating sleeve K is clamped on the inner side of the outer tube portion 5401 to prevent the heating sleeve K from bending too much due to weight or natural hanging and thus easily detaching from the connecting tube 54, affecting the olfactory test.

The connecting tube 54 is provided with a stand to make it at a target height to dock with the gas extraction needle.

The flow regulating valve 56 is an EPC electronic pressure controller. The flow regulating valve 56 transmits information such as flow rate and pressure to the controller and is controlled by the controller.

In practical applications, the EPC electronic pressure controller may also be equipped with a flow adjustment knob, through which the gas flow rate may be manually adjusted, and the flow adjustment knob may be set to off, 1ml/min, 2ml/min, 3ml/min, 4ml/min, 5ml/min, 6ml/min, and the gas flow rate may also be adjusted through the above-mentioned human-computer interaction module L. The pipeline structure may also be adaptively equipped with conventional components such as an air pump.

A section of river in Guangzhou Yunpu Industrial Zone often emits a peculiar smell, and it is necessary to identify the odorous substances.

The main operation process is as follows:

(1) The sniffer conducts on-site sniffing of the polluted waters. Environmental protection personnel trace the source of the river upstream to collect odorous water samples. At the same time, they record the ambient temperature (31°C) and ambient humidity (75%) of the polluted waters. The odorous water samples are sealed and taken back to the laboratory.

(2) The odorous water sample is pre-treated to enrich and extract to meet the injection requirements of gas chromatograph B.

(3) The odorous water sample after pretreatment enters the gas chromatograph B through the automatic sample injector, and at the same time, helium as a carrier gas is introduced through the first carrier gas supply source A to mix with the odorous water sample. The odorous water sample is vaporized at the inlet of the heated gas chromatograph B to form an unseparated gas sample;

The substances in the unseparated gas sample are separated in sequence by the gas chromatograph B to produce several portions of the first gas sample. The first gas sample enters the four-way valve 1 through the first interface 101, and at the same time, the helium delivered by the second carrier gas supply source C enters the four-way valve 1 through the third interface 103. The first gas sample and the helium are counter-mixed in the four-way valve 1, and then flow to the detector D and the gas injection module E respectively through the second interface 102 and the fourth interface 104 of the four-way valve 1.

(2) Collection of a single second gas sample: The system pre-sets a unit time period of 1 minute. The starting position of the inner end of the gas injection push rod 25 is set between the first connecting pipe 2801 and the second connecting pipe 2802. The inner pipe opening of the first connecting pipe 2801 is exposed to the inner cavity of the gas injection cylinder 28, so that the gas can enter the cylinder cavity. The inner pipe opening of the second connecting pipe 2802 is blocked by the gas injection push rod 25 and is not exposed to the inner cavity of the gas injection cylinder 28, so as to prevent the gas entering the cylinder cavity from flowing out through the second connecting pipe 2802.

The gas storage module F rotates the mouth of the gas sample storage bottle 32 numbered 1 to align with the gas injection needle, and the first motor 31 and the second motor are started, indirectly driving the gas injection needle of the gas injection syringe to penetrate into the gas sample storage bottle 32. After 1 minute, the first motor 31 drives the gas injection push rod 25 to advance in the direction of the gas injection needle, and the gas in the gas injection cylinder 28 is injected into the gas sample storage bottle 32 to form a second gas sample.

(3) The first motor 31 and the second motor are started to indirectly drive the gas injection syringe to withdraw from the gas sample storage bottle 32 into which the gas has been injected, and the first motor 31 then drives the gas injection push rod 25 to slide in a direction away from the gas injection needle until the inner tube opening of the second connecting pipe 2802 is exposed in the cylinder cavity of the gas injection cylinder 28;

The cleaning gas supply source repeatedly pumps or draws nitrogen as a cleaning gas into the barrel cavity through the second connecting pipe 2802, and the cleaning gas purges and cleans the barrel cavity. After the barrel cavity is cleaned, the first motor 31 starts and indirectly drives the gas injection push rod 25 to reset, that is, the gas injection push rod 25 resets to between the first connecting pipe 2801 and the second connecting pipe 2802.

(4) The gas storage module F starts the first rotating motor 39, which indirectly drives the rotating frame to rotate so that the next gas sample storage bottle 32 that has not been injected with gas sample is aligned with the gas injection needle.

(5) Repeat steps (2) to (4), and the gas chromatograph B completes the separation of the unseparated gas sample and collects 45 second gas samples.

(6) The starting position of the gas extraction push rod 44 is set so that the inner end of the gas extraction push rod 44 is located closest to the gas extraction needle, and the gas extraction procedure begins. The gas storage module F rotates the mouth of the gas sample storage bottle 32 corresponding to number 1, which has collected the second gas sample, to align with the gas extraction needle.

(7) The third motor 51 and the fourth motor are started, indirectly driving the gas extraction needle of the gas extraction syringe to penetrate into the gas sample storage bottle 32, and the third motor 51 then drives the gas extraction push rod 44 to slide in the direction away from the gas extraction needle. The inner end of the gas extraction push rod 44 will not exceed the fourth connecting pipe 4201, causing the fourth connecting pipe 4201 to be exposed in the cylinder cavity of the gas extraction cylinder 42, thereby preventing the extracted second gas sample from entering the fourth connecting pipe 4201 and flowing out. The second gas sample is extracted into the gas extraction cylinder 42.

(8) The heating sleeve K between the connecting tube 54 and the handheld box 8 has been preheated to 31° C., the refrigeration component J in the handheld box 8 is not started, and at the same time, the humidification module I is started to deliver 31° C. humidified air to the three-way valve 4;

The third motor 51 and the fourth motor are started, indirectly driving the gas extraction syringe to withdraw from the gas sample storage bottle 32, the rotating platform 49 rotates 180°, the gas extraction needle is aligned with the elastic injection plug of the connecting tube 54, the third motor 51 and the fourth motor are started, indirectly driving the gas extraction syringe to penetrate the connecting tube 54, the third motor 51 indirectly drives the gas extraction push rod 44 to slide in the direction of the gas extraction needle, the gas in the gas extraction cylinder part 42 is injected into the connecting tube 54, and in the process of being transported to the three-way valve 4, the gas is heated to 31°C by the heating sleeve K, and mixed with 31°C humid air, and finally flows to the sniffing port 11 for the olfactory operator to smell.

(9) The rotating platform 49 rotates another 180°, and the third motor 51 drives the gas extraction push rod 44 to slide in a direction away from the gas extraction needle until the inner tube opening of the fourth connecting tube 4201 is exposed in the cylinder cavity of the gas extraction cylinder 42;

The cleaning gas supply source repeatedly pumps or draws cleaning gas into the barrel cavity through the fourth connecting pipe 4201, and the cleaning gas purges and cleans the barrel cavity. After the barrel cavity is cleaned, the third motor 51 is started to indirectly drive the gas extraction push rod 44 to reset, that is, the gas extraction push rod 44 is reset to the position where the inner end of the gas extraction push rod 44 is located closest to the gas extraction needle.

(10) The gas storage module F starts the first rotating motor 39, which indirectly drives the rotating frame to rotate so that the next gas sample storage bottle 32 is aligned with the gas extraction needle;

(11) repeating steps (7) to (10) until 45 portions of the second gas samples are successively delivered to the olfactory port 11;

The smeller pointed out that the second gas samples of No. 20 and No. 25 had a strange smell. The second gas sample of No. 20 had a fragrant smell, and the second gas sample of No. 25 had a sickening sweet smell, but they were not exactly the same as the odor of polluted waters.

(12) Gas mixing operation of the third gas sample: the gas storage module F aligns the gas sample storage bottles 32 of No. 20 and No. 25 with the gas sampling needle in turn, and the gas sampling syringe performs two "insertion-extraction-exit" actions. The second gas samples of No. 20 and No. 25 are mixed in the gas sampling syringe to form a third gas sample, and step (8) is performed. After sniffing, the olfactory staff points out that the third gas sample has the same odor as the polluted water area. After checking the detector D, the substance of No. 20 is 4-methylcyclohexanol, and the substance of No. 25 is 2-ethyl-5,5-dimethyl-1,3-dioxane. The literature is consulted to verify the description of the odor characteristics of 4-methylcyclohexanol and 2-ethyl-5,5-dimethyl-1,3-dioxane. The literature records the odor of the two and the description of the olfactory staff are consistent, and the odor substances of the polluted water area are determined.

Based on the above test results, targeted treatment was carried out on this river section and the odor was effectively controlled, which shows that the present invention can effectively improve the accuracy of identifying odorous substances in polluted waters.

According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also change and modify the above implementation modes. Therefore, the present invention is not limited to the specific implementation modes disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims (10)

1. A method for improving the accuracy of identifying peculiar smell substances, which is suitable for a polluted water area, is characterized in that a gas chromatograph sequentially separates a plurality of generated gas samples, and each gas sample is divided into two parts, namely a first part and a second part;

the first part is conveyed to a detector for qualitative and quantitative analysis;

And heating or cooling the second part to simulate the environmental temperature of the polluted water area site, mixing a proper amount of humid air to simulate the gas composition and the environmental humidity of the polluted water area site, and finally conveying the mixture to a sniffing port for sniffing and distinguishing by a sniffer.

2. The method for improving the accuracy of identifying odorous substances in a contaminated water area according to claim 1, comprising the steps of:

1) The gas chromatograph sequentially separates and generates a plurality of first gas samples, and each first gas sample is divided into two parts, namely a first part and a second part;

2) The first part is conveyed to a detector for qualitative and quantitative analysis;

The second part is sequentially conveyed to the gas storage module for storage respectively to form a plurality of second gas samples, the plurality of second gas sample taking parts are heated or cooled to simulate the environmental temperature of the polluted water area site, a proper amount of moist air is mixed to simulate the gas composition and the environmental humidity of the polluted water area site, then the mixture is sequentially conveyed to the sniffing port for sniffing and distinguishing by sniffers, the sniffing Wen Yuan indicates a certain second gas sample which is the same or basically the same as the peculiar smell of the polluted water area, the peculiar smell substances of the polluted water area are determined,

Or the sniffer indicates more than one second gas sample with peculiar smell, and then the step 3) is executed;

3) The method comprises the steps of sequentially mixing more than one part of second gas samples with peculiar smell in a permutation and combination mode or mixing according to the combination appointed by a sniffer and a detector to form one or more than one part of third gas samples, heating or cooling the formed third gas samples to simulate the environmental temperature of a polluted water area site, mixing a proper amount of humid air to simulate the gas composition and the environmental humidity of the polluted water area site, sequentially conveying the mixed gas samples to a sniffer port for sniffing resolution by the sniffer, and sniffer Wen Yuan indicates a part of third gas samples which are closest to or the same as the peculiar smell of the polluted water area, so as to determine peculiar smell substances of the polluted water area.

3. The method for improving the accuracy of identifying odorous substances in a contaminated water area according to claim 2, comprising the steps of:

1-a) a sniffer sniffs a polluted water area on site, collects an odor water sample or/and an odor gas sample of the polluted water area emitting odor, and records the environmental temperature and the environmental humidity of the polluted water area;

1-b) preprocessing the peculiar smell water sample or/and the peculiar smell gas sample to meet the sample feeding requirement of a gas chromatograph;

1-c) introducing the pretreated peculiar smell water sample or/and peculiar smell gas sample into a gas chromatograph, introducing carrier gas and mixing the carrier gas to form an unseparated gas sample, sequentially separating substances in the unseparated gas sample through the gas chromatograph to generate a plurality of first gas samples, wherein each first gas sample is divided into two parts, and the first part and the second part are set;

2-a) delivering the first fraction to a detector for qualitative and quantitative analysis;

Sequentially conveying the second parts to a gas storage module for storage respectively, presetting a unit time period, collecting and numbering the gas in the preset unit time period to form a plurality of second gas samples, and ending the separation of substances collected to a gas chromatograph;

2-b) sequentially conveying a plurality of parts of second gas sample extraction parts to a sniffing port;

heating or cooling the second gas sample in the conveying process according to the ambient temperature recorded in the step 1-a) to simulate the ambient temperature of the polluted water area site, and mixing a proper amount of humid air according to the ambient humidity recorded in the step 1-a) to simulate the gas composition and the ambient humidity of the polluted water area site, so that a sniffer sniffs the second gas sample;

2-c) a sniffer indicates a certain second gas sample which is the same or basically the same with the peculiar smell of the polluted water area, records the peculiar smell characteristics of the second gas sample, checks the number of the second gas sample and the corresponding time period, checks the substances detected by the detector in the time period, obtains the peculiar smell characteristics of the substances through literature retrieval or experiments, compares the consistency of the peculiar smell characteristics to determine the peculiar smell substances of the polluted water area, or indicates more than one second gas sample with peculiar smell by the sniffer, and then step 3) is executed;

3) The method comprises the steps of sequentially mixing more than one part of second gas samples with peculiar smell in a permutation and combination mode or mixing according to the combination appointed by a sniffer and a detector to form one or more than one part of third gas samples, heating or cooling the formed third gas samples to simulate the environmental temperature of a polluted water area site, mixing a proper amount of humid air to simulate the gas composition and the environmental humidity of the polluted water area site, sequentially conveying the mixed gas samples to a sniffer port for sniffing resolution by the sniffer, and sniffer Wen Yuan indicates a part of third gas samples which are closest to or the same as the peculiar smell of the polluted water area, so as to determine peculiar smell substances of the polluted water area.

4. The system for improving the accuracy of identifying the peculiar smell substances is suitable for a polluted water area and is characterized by comprising a gas chromatograph, a detector, a controller, a first carrier gas supply source, a second carrier gas supply source, a dry air supply source, a temperature control module, a humidifying module, a sniffing port and a pipeline structure;

The output end of the first carrier gas supply source is communicated to the gas chromatograph;

The gas chromatograph comprises a separation chromatographic column with a coating, wherein the output end of the gas chromatograph and the output end of the second carrier gas supply source are communicated and collected through a pipeline structure and are respectively communicated with the input end of the detector and the input end of the sniffing port directly or indirectly through the pipeline structure;

The output end of the dry air supply source is communicated with the input end of the humidifying module, and the output end of the humidifying module is communicated with the input end of the sniffing port;

At least the position close to the input end of the sniffing port is provided with the temperature control module so as to heat or cool the gas in the pipeline.

5. The system for improving the accuracy of identifying odorous substances in a contaminated water area according to claim 4, wherein said piping structure comprises a four-way valve, a three-way valve and a plurality of conduits;

the first interface of the four-way valve is directly or indirectly communicated to the gas output end of the gas chromatograph through a conduit;

The second interface of the four-way valve is directly or indirectly communicated to the input end of the detector through a conduit;

the third interface of the four-way valve is directly or indirectly communicated to the output end of the second carrier gas supply source through a conduit;

the fourth interface of the four-way valve is directly or indirectly communicated with the fifth interface of the three-way valve through a conduit;

the sixth interface of the three-way valve is directly or indirectly communicated to the output end of the humidifying module through a conduit;

the seventh interface of the three-way valve is directly or indirectly communicated with the input end of the sniffing port through a conduit.

6. The system for improving the accuracy of identifying odorous substances in a polluted water area according to claim 4 or 5, wherein a gas storage and mixing device is arranged between the sniffing port and the communicating and collecting position of the output end of the gas chromatograph and the output end of the second carrier gas supply source.

7. The system for improving the accuracy of identifying peculiar smell substances, which is applicable to a polluted water area, according to claim 4 or 5, wherein the temperature control module has a temperature rising gas function and a temperature reducing gas function, the opening or closing of each function of the temperature control module and the temperature regulation of each function of the temperature control module are controlled by a controller, and the temperature control module comprises a heating sleeve and a refrigerating assembly;

the heating sleeve comprises a bendable copper pipe, a resistance heating wire, heat-insulating cotton and a temperature rising sensor, and the heating sleeve is wrapped outside a pipeline structure at least close to the sniffing port;

The periphery of the guide pipe is sequentially wrapped with a bendable copper pipe, a resistance heating wire and heat preservation cotton, the resistance heating wire heats and conducts heat to the bendable copper pipe, and the bendable copper pipe conducts heat to the pipeline structure, so that the gas sample is heated; the temperature rising sensor monitors the temperature of the resistance heating wire and transmits temperature information to the controller;

the refrigerating assembly comprises a refrigerating cavity for containing gas, a semiconductor refrigerating sheet and a cooling sensor, and is arranged between a pipeline structure with a heating sleeve wrapped outside and a sniffing port;

The refrigerating cavity is provided with an inlet and an outlet, the inlet is directly or indirectly communicated with a pipeline structure with a heating sleeve wrapped outside, and the outlet is directly or indirectly communicated with the input end of the sniffing port; the semiconductor refrigerating sheet cools the gas in the refrigerating cavity to a specified temperature, and the temperature-lowering sensor monitors the temperature in the refrigerating cavity.

8. The system for improving accuracy of identifying odorous substances in a contaminated water area according to claim 4 or 5, wherein the humidification module comprises a flow regulating valve, a humidification bottle, an input air pipe, an output air pipe, an air input port and a moisture output port;

The air input port is respectively communicated with the output end of the dry air supply source and the input end of the input air pipe, a flow regulating valve is arranged between the air input port and the dry air supply source, the output end of the input air pipe stretches into the humidifying bottle below the liquid level, the input end of the output air pipe stretches into the humidifying bottle and is positioned above the liquid level, purified water is filled in the humidifying bottle, and a certain space is reserved between the liquid level of the purified water and the bottle mouth;

The output end of the output air pipe is communicated with the moisture output port, and the moisture output port is directly or indirectly communicated with the sniffing port;

The output end of the input air pipe is provided with a porous wetting piece, and the porous wetting piece is positioned below the liquid level of the humidifying bottle.

9. The system for improving the accuracy of identifying odorous substances in a contaminated water area according to claim 7,

The heating sleeve is wrapped outside the conduit between the first interface and the gas chromatograph, and the heating temperature of the heating sleeve is set to at least keep the gas in the conduit in a gaseous state;

A heating sleeve is wrapped outside the conduit between the second interface and the detector, and the heating temperature of the heating sleeve is set to at least keep the gas in the conduit in a gaseous state;

a flow regulating valve is arranged on the conduit between the third interface and the second carrier gas supply source;

a heating sleeve is wrapped outside the conduit between the fourth interface and the gas injection module, and a flow regulating valve is arranged at the same time, and the heating temperature of the heating sleeve is set to at least keep the gas in the conduit in a gaseous state;

A heating sleeve is wrapped outside the conduit between the fifth interface and the gas taking module, and a flow regulating valve is arranged at the same time, wherein the heating temperature of the heating sleeve is set to be the same as the ambient temperature of the polluted water area;

And a heating sleeve is wrapped outside the conduit between the sixth interface and the humidifying module, and a flow regulating valve is arranged at the same time, and the heating temperature of the heating sleeve is set to be the same as the ambient temperature of the gas in the conduit and the polluted water area.

10. The system for improving accuracy of identifying malodorous substances in a contaminated water area according to claim 7, wherein the sniffing port is a horn-like structure having a narrow opening and a wide opening, the outer contour of the wide opening conforms to the shape of a nose, and the narrow opening is detachably mounted on the side of a hand-held box;

The refrigerating assembly is arranged at one side, close to the sniffing port, of the interior of the handheld box, the semiconductor refrigerating sheet is arranged at the top of the refrigerating cavity, and the cooling sensor is arranged at the bottom of the refrigerating cavity;

The other side of the three-way valve is fixedly provided with the three-way valve, a fifth interface of the three-way valve is communicated with a pipeline structure wrapped with a heating sleeve, a sixth interface of the three-way valve is communicated with the output end of the humidifying module, and a seventh interface of the three-way valve is communicated with an inlet of the refrigerating cavity.