CN113029744A - Device for determining and pre-concentrating volatile organic compounds in ambient air and application - Google Patents
Device for determining and pre-concentrating volatile organic compounds in ambient air and application Download PDFInfo
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- CN113029744A CN113029744A CN202110207056.4A CN202110207056A CN113029744A CN 113029744 A CN113029744 A CN 113029744A CN 202110207056 A CN202110207056 A CN 202110207056A CN 113029744 A CN113029744 A CN 113029744A
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- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 28
- 239000012080 ambient air Substances 0.000 title claims abstract description 23
- 239000007789 gas Substances 0.000 claims abstract description 145
- 238000005057 refrigeration Methods 0.000 claims abstract description 33
- 238000010201 enrichment analysis Methods 0.000 claims abstract description 25
- 239000004065 semiconductor Substances 0.000 claims abstract description 22
- 238000010926 purge Methods 0.000 claims abstract description 20
- 239000012159 carrier gas Substances 0.000 claims abstract description 17
- 238000002076 thermal analysis method Methods 0.000 claims abstract description 7
- 238000004445 quantitative analysis Methods 0.000 claims abstract 2
- 238000004458 analytical method Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 18
- 238000001179 sorption measurement Methods 0.000 claims description 12
- 239000003463 adsorbent Substances 0.000 claims description 10
- 238000003795 desorption Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000004094 preconcentration Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000000523 sample Substances 0.000 description 29
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000003570 air Substances 0.000 description 2
- 239000012468 concentrated sample Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000011002 quantification Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 238000006552 photochemical reaction Methods 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/4022—Concentrating samples by thermal techniques; Phase changes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/405—Concentrating samples by adsorption or absorption
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
- G01N30/08—Preparation using an enricher
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention belongs to the technical field of environmental protection detection, and particularly relates to a device for measuring and pre-concentrating volatile organic compounds in ambient air, which comprises: the enrichment analysis module comprises refrigeration, cold trap enrichment and thermal analysis; the gas path module comprises a first gas path, a second gas path, a third gas path and a fourth gas path; the first gas path is a sample gas path; the second gas path is a carrier gas and/or purging gas path; the third gas path and the fourth gas path are analyzer carrier gas paths; the valve module comprises a six-way valve, a ten-way valve and a second electromagnetic valve, wherein the six-way valve is connected with the enrichment analysis module and is used for enriching and analyzing the sample gas; the ten-way valve is connected with the quantitative ring and is used for quantitative analysis of the sample; the second electromagnetic valve is connected with the six-way valve and the ten-way valve to intercept the sample gas; the invention effectively improves the semiconductor refrigeration effect and prolongs the service life of the refrigeration piece.
Description
Technical Field
The invention belongs to the technical field of environmental protection detection, and particularly relates to a pre-concentration device for determining volatile organic compounds in ambient air and application thereof.
Background
Volatile Organic Compounds (VOCs) are organic compounds participating in atmospheric photochemical reaction, are important precursors for forming ozone and PM2.5, can cause environmental pollution, and cause serious damage to human health due to long-time contact, so that the concentration of the volatile organic compounds in the ambient air needs to be accurately detected, and an effective basis is provided for the treatment and control of the VOCs. Because volatile organic compounds in ambient air have the characteristics of various types, large boiling point span, low concentration and the like, corresponding detection equipment is required to have lower detection limit and higher accuracy.
The existing detection equipment adopts a technical scheme that a pretreatment device is mostly adopted to carry out low-temperature preconcentration-thermal analysis on trace volatile organic compounds, and then a gas chromatographic analyzer with an FID (fast infrared spectroscopy) and/or MS (mass spectrometer) detector is used for detecting the trace volatile organic compounds. The detection limit can reach ppb level or even ppt level by a pre-concentration method of a pretreatment device. The refrigeration technology in the pre-concentration pretreatment device mainly comprises semiconductor electronic refrigeration, liquid nitrogen refrigeration and compressor mechanical refrigeration schemes, but all have different defects to limit the use of the devices. Liquid nitrogen refrigeration is expensive; the refrigerating volume of the compressor is too large, and Freon needs to be added regularly, thus polluting the environment.
The semiconductor has poor refrigeration effect and is not high temperature resistant, so that improvement is necessary to overcome the defects in practical application.
Disclosure of Invention
Based on the above-mentioned shortcomings and drawbacks of the prior art, it is an object of the present invention to at least solve one or more of the above-mentioned problems of the prior art, in other words, to provide an apparatus for pre-concentration of volatile organic compounds in ambient air, which satisfies one or more of the above-mentioned requirements.
It is another object of the present invention to provide an application of a pre-concentration device for measuring volatile organic compounds in ambient air, which satisfies one or more of the above requirements.
In order to achieve the purpose, the invention adopts the following technical scheme:
an apparatus for pre-concentrating volatile organic compounds in ambient air, comprising:
the enrichment analysis module comprises refrigeration, cold trap enrichment and thermal analysis;
the gas path module comprises a first gas path, a second gas path, a third gas path and a fourth gas path,
the valve module comprises a six-way valve, a ten-way valve and a second electromagnetic valve, and the first gas path and the second gas path are connected with the enrichment analysis module through the six-way valve so as to enrich and analyze the sample gas; the third gas path and the fourth gas path are connected with an analyzer through a ten-way valve so as to quantify and analyze the sample; and the second electromagnetic valve is connected with the six-way valve and the ten-way valve so as to intercept the sample gas.
As a preferred scheme, the enrichment and analysis module realizes refrigeration through a double-layer semiconductor electronic refrigeration piece; when the enrichment analysis module is in a high-temperature analysis state, the temperature is kept below 90 ℃ through the double-layer semiconductor refrigerating sheet; the cold trap is used for enriching and adsorbing volatile organic gas by a combined adsorbent; thermal desorption was increased to 300 ℃ by heating wire.
As a preferred scheme, the analyzer comprises a first analyzer and a second analyzer, the third gas path is a first analyzer carrier gas path, and the fourth gas path is a second analyzer carrier gas path; the quantitative rings comprise a first quantitative ring and a second quantitative ring, and the first quantitative ring and the second quantitative ring are respectively connected with the ten-way valve.
As a preferred scheme, the second gas path is a carrier gas path in the analysis process, and the sample is conveyed into the first quantitative ring and the second quantitative ring after enrichment and analysis; the second gas path is a purging gas path in the purging process, and the adsorption pipe, the first quantitative ring and the second quantitative ring are subjected to back flushing in the purging process.
Preferably, the first gas path is controlled by a first MFC, the second gas path is controlled by a second MFC, the third gas path is controlled by a first analyzer, and the fourth gas path is controlled by a second analyzer.
As a preferred scheme, the ten-way valve is communicated with the second gas path, the third gas path and the fourth gas path; when the ten-way valve is in a reset state, the second gas path is communicated with the quantitative ring through the ten-way valve, the third gas path is communicated with the first analyzer through the ten-way valve, and the fourth gas path is communicated with the third analyzer through the ten-way valve; when the ten-way valve is in the valve-switching state, the second gas path is communicated with the evacuation port through the ten-way valve, the third gas path is communicated with the first analyzer through the ten-way valve, and the fourth gas path is communicated with the second analyzer through the ten-way valve.
As a preferred scheme, the six-way valve is communicated with the first gas path, the second gas path and the enrichment and analysis module; when the six-way valve is in a reset state, the first gas path is communicated with the exhaust port, and the second gas path is communicated with the enrichment analysis module through the six-way valve; when the six-way valve is in the valve-switching state, the first gas path is communicated with the enrichment analysis module through the six-way valve, and the second gas path is connected with the second electromagnetic valve through the six-way valve.
Preferably, a second electromagnetic valve is arranged between the six-way valve and the ten-way valve.
Preferably, the cold trap enrichment adopts an adsorption tube, the adsorption tube is filled with adsorbents, the adsorbents are combined into carbon pack C, carbon pack B and carbon pack 1000, and the lengths of the adsorbents are respectively 13mm, 25mm and 13 mm.
The invention also provides an application of the device for measuring and pre-concentrating the volatile organic compounds in the ambient air, wherein the device for measuring and pre-concentrating the volatile organic compounds in the ambient air is used for cooling, enriching, heating, analyzing, sample conveying (quantifying and/or analyzing) and purging a sample.
Compared with the prior art, the invention has the beneficial effects that:
the pre-concentration device for volatile organic compounds C2-C12 hydrocarbon in ambient air adopts double-layer semiconductor electronics for refrigeration, so that the refrigeration effect of the semiconductor is effectively improved, the semiconductor refrigeration piece performs uninterrupted refrigeration, the semiconductor refrigeration piece is not lost in a high-temperature environment, and the service life of the refrigeration piece is prolonged. Meanwhile, the ten-way valve is added, and the pre-concentrated sample is quantitatively sent to the two analyzers at the same time, so that the uniqueness of the sample in the two analyzers is ensured, and the functional requirements on the rear-end analyzer can be reduced.
Drawings
Fig. 1 is a schematic flow chart of cooling/heating/analyzing/sample feeding (quantitative)/purging according to a first embodiment of the present invention;
FIG. 2 is a schematic flow chart of enrichment according to the first embodiment of the present invention;
fig. 3 is a schematic flow chart of sample feeding (analysis) according to a first embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, the following description will explain the embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
The first embodiment is as follows:
as shown in fig. 1 to 3, the present embodiment provides an apparatus for pre-concentrating volatile organic compounds in ambient air, comprising:
the enrichment analysis module is used for refrigerating the sample gas, enriching the cold trap and carrying out thermal analysis;
the gas path module comprises a first gas path, a second gas path, a third gas path and a fourth gas path;
the valve module comprises a six-way valve, a ten-way valve and a second electromagnetic valve, and the first gas path and the second gas path are connected with the enrichment analysis module through the six-way valve so as to enrich and analyze the sample gas; the third gas path and the fourth gas path are connected with an analyzer through a ten-way valve so as to quantify and analyze the sample; and the second electromagnetic valve is connected with the six-way valve and the ten-way valve so as to intercept the sample gas.
Specifically, the refrigeration of the enrichment and desorption module adopts a double-layer semiconductor electronic refrigeration mode, the temperature is reduced to-30 ℃, the semiconductor refrigerating sheet performs uninterrupted refrigeration, when the module enters a high-temperature desorption state, the cold surface temperature of the double-layer semiconductor refrigerating sheet is kept below 90 ℃, the cold trap enrichment adopts an adsorption tube, the adsorption tube is filled with a combined adsorbent capable of adsorbing C2-C12 volatile organic gas, and the thermal desorption adopts a heating wire electric thermal coupling principle to rapidly raise the desorption temperature to 300 ℃.
The analyzer comprises a first analyzer and a second analyzer, the third gas path is a first analyzer carrier gas path, and the fourth gas path is a second analyzer carrier gas path; the quantitative rings comprise a first quantitative ring and a second quantitative ring, and the first quantitative ring and the second quantitative ring are respectively connected with the ten-way valve.
The second gas path is a carrier gas path in the analysis flow, and the sample is conveyed into the first quantitative ring and the second quantitative ring after enrichment and analysis; the second gas path is a purging gas path in the purging process, and the adsorption pipe, the first quantitative ring and the second quantitative ring are subjected to back flushing in the purging process. The first gas path is controlled by the first MFC, the second gas path is controlled by the second MFC, the third gas path is controlled by the first analyzer, the fourth gas path is controlled by the second analyzer, and a second electromagnetic valve is arranged between the six-way valve and the ten-way valve.
The six-way valve is communicated with the first gas path, the second gas path and the enrichment analysis module; when the six-way valve is in a reset state, the first gas path is communicated with the exhaust port through the six-way valve interface 11 and the interface 16, and the second gas path is sequentially connected with the six-way valve interface 14, the interface 15, the enrichment analysis module, the interface 12 and the interface 13; when the six-way valve is in the valve-switching state, the first air path is sequentially connected with the six-way valve interface 11, the interface 12, the enrichment analysis module, the interface 15 and the interface 16; the second air path is connected with the interface 14 and the interface 13 of the six-way valve in sequence and is connected with the second electromagnetic valve.
The ten-way valve is communicated with the second gas path, the third gas path and the fourth gas path; when the ten-way valve is in a reset state, the second gas path is connected with the evacuation port through the interface 1, the interface 10, the second quantitative ring, the interface 7, the interface 6, the first quantitative ring, the interface 3 and the interface 2 of the ten-way valve; the third gas path is communicated with the first analyzer through a port 5 and a port 4 of the ten-way valve; the fourth gas path is communicated with a third analyzer through a port 9 and a port 8 of the ten-way valve; when the ten-way valve is in the valve-switching state, the second gas path is communicated with the evacuation port through the interface 1 and the interface 2 of the ten-way valve; the third gas path is communicated with a first analyzer through a port 5, a port 6, a first quantitative ring, a port 3 and a port 4 of the ten-way valve; the fourth gas path is communicated with a second analyzer through a port 10, a port 9, a second quantitative ring, a port 7 and a port 8 of the ten-way valve.
The device for pre-concentrating the volatile organic compounds in the ambient air includes six processes, namely, cooling, enrichment, voiceprint, analysis, sample delivery (quantification and/or analysis), and purging. And (3) a cooling process and a heating process, wherein when the set temperature is reached, the enrichment, analysis, sample conveying (quantification and analysis) and purging processes are ended when the set time is reached.
When the temperature is reduced, the six-way valve is in a reset state, and the ten-way valve is in a reset state. During enrichment, the six-way valve is in a valve cutting state, and the ten-way valve is in a resetting state. When the temperature is raised, analyzed and the sample is sent (quantified), the six-way valve is in a reset state, and the ten-way valve is in a reset state. When the sample is sent (analyzed), the six-way valve is in a reset state, and the ten-way valve is in a valve cutting state. During purging, the six-way valve is in a reset state, and the ten-way valve is in a reset state.
The enrichment and analysis module comprises three parts of refrigeration, cold trap enrichment and thermal analysis, wherein the refrigeration adopts a double-layer semiconductor motor refrigeration mode, the temperature is reduced to-30 ℃, the semiconductor refrigerating sheet performs uninterrupted refrigeration, and when the enrichment and analysis module enters a high-temperature analysis state, the cold surface temperature of the double-layer semiconductor refrigerating sheet is kept below 90 ℃. The cold trap enrichment adopts the heating electric thermocouple principle to rapidly raise the desorption temperature to 300 ℃.
The gas circuit module comprises a first gas circuit, a second gas circuit, a third gas circuit and a fourth gas circuit, the first gas circuit is a sample gas circuit and is used for sample gas collection, the second gas circuit is a carrier gas/purging gas circuit and is used as a carrier gas to send a sample into the quantitative ring after the analysis state is finished, the adsorption tube, the first quantitative ring and the second quantitative ring are subjected to back flushing in the purging state, the third gas circuit is a first analyzer carrier gas circuit, and the fourth gas circuit is a second analyzer carrier gas circuit.
The first MFC is used for controlling the first gas circuit flow, and the second MFC is used for controlling the second gas circuit flow. And the second electromagnetic valve of the valve module is opened after the analysis is finished and closed after the blowing is finished.
The specification of the adsorption tube in this embodiment is 6 × 150mm, and the adsorbent combination in the adsorption tube is Carbopack C, Carbopack B and Carbopack 1000, and the lengths are 13mm, 25mm and 13mm, respectively.
When the device for measuring the volatile organic compounds in the ambient air is in standby, the six-way valve and the ten-way valve are in the reset state, and the second electromagnetic valve is in the closed state. And (5) starting a cooling process, and starting the semiconductor refrigerating sheet to work. When the temperature is reduced to-30 ℃ of the set enrichment temperature, the enrichment process starts, the valve module drives the six-way valve to switch the gas path, the first gas path is sequentially communicated with the interface 11, the interface 12, the enrichment analysis module, the interface 15 and the interface 16 of the six-way valve, and finally enters the evacuation port, and the sample gas is enriched in the enrichment analysis module at this time. When the enrichment time is over, the valve module drives the six-way valve to reset, the second gas path is communicated with the interface 14, the interface 15, the enrichment analysis module, the interface 12 and the interface 13 of the six-way valve in sequence, when the temperature rise process begins, the semiconductor refrigerating sheet continues to work, the electric heating wire begins to heat, and the temperature of the adsorption tube rapidly rises to 300 ℃. When the analysis process is started, the thermal analysis time is finished, the sample feeding (quantitative) process is started, the second electromagnetic valve is opened at the moment, the second gas path sequentially enters the interface 1, the interface 10, the second quantitative ring, the interface 7, the interface 6, the first quantitative ring, the interface 3 and the interface 2 of the ten-way valve through the second electromagnetic valve and finally enters the evacuation port, the sample feeding (quantitative) process is started, the valve module drives the ten-way valve to switch the gas path, and the third gas path sequentially passes through the interface 5, the interface 6, the first quantitative ring, the interface 3 and the interface 4 of the ten-way valve, so that the first quantitative ring sample is fed into the first analyzer. The fourth gas path flows through the interface 10, the interface 9, the second quantitative ring, the interface 7 and the interface 8 of the ten-way valve in sequence, so that the second quantitative ring sample is sent to the second analyzer.
Correspondingly, the embodiment also provides the application of the device for measuring the pre-concentration of the volatile organic compounds in the ambient air, wherein the device for measuring the pre-concentration is used for cooling, enriching, heating, analyzing, sample conveying (quantifying and/or analyzing) and purging the sample.
This embodiment effectively promotes semiconductor refrigeration effect through adopting double-deck semiconductor electron refrigeration, and the incessant refrigeration of semiconductor refrigeration piece makes it not receive the loss under high temperature environment, extension refrigeration piece life. Meanwhile, the ten-way valve is added, and the pre-concentrated sample is quantitatively sent to the two analyzers at the same time, so that the uniqueness of the sample in the two analyzers is ensured, and the functional requirements on the rear-end analyzer can be reduced.
The foregoing has outlined rather broadly the preferred embodiments and principles of the present invention and it will be appreciated that those skilled in the art may devise variations of the present invention that are within the spirit and scope of the appended claims.
Claims (10)
1. A device for pre-concentrating volatile organic compounds in ambient air, comprising:
the enrichment analysis module comprises refrigeration, cold trap enrichment and thermal analysis;
the gas path module comprises a first gas path, a second gas path, a third gas path and a fourth gas path; the first gas path is a sample gas path; the second gas path is a carrier gas and/or purging gas path; the third gas path and the fourth gas path are analyzer carrier gas paths;
the valve module comprises a six-way valve, a ten-way valve and a second electromagnetic valve, wherein the six-way valve is connected with the enrichment analysis module and is used for enriching and analyzing the sample gas; the ten-way valve is connected with the quantitative ring and is used for quantitative analysis of the sample; and the second electromagnetic valve is connected with the six-way valve and the ten-way valve so as to intercept the sample gas.
2. The device for determining and pre-concentrating volatile organic compounds in ambient air according to claim 1, wherein the enrichment and desorption module realizes refrigeration through a double-layer semiconductor electronic refrigeration sheet; when the enrichment analysis module is in a high-temperature analysis state, the temperature is kept below 90 ℃ through the double-layer semiconductor refrigerating sheet; the cold trap is used for enriching and adsorbing volatile organic gas by a combined adsorbent; thermal desorption was increased to 300 ℃ by heating wire.
3. The device for determining and pre-concentrating volatile organic compounds in ambient air according to claim 1, wherein the analyzer comprises a first analyzer and a second analyzer, the third gas path is a first analyzer carrier gas path, and the fourth gas path is a second analyzer carrier gas path; the quantitative rings comprise a first quantitative ring and a second quantitative ring, and the first quantitative ring and the second quantitative ring are respectively connected with the ten-way valve.
4. The device for pre-concentrating and measuring volatile organic compounds in ambient air according to claim 3, wherein the second gas path is a carrier gas path in the desorption process, and the sample is sent into the first quantitative ring and the second quantitative ring after enrichment and desorption; the second gas path is a purging gas path in the purging process, and the adsorption pipe, the first quantitative ring and the second quantitative ring are subjected to back flushing in the purging process.
5. The apparatus of claim 3, wherein the first gas path is controlled by a first MFC, the second gas path is controlled by a second MFC, the third gas path is controlled by a first analyzer, and the fourth gas path is controlled by a second analyzer.
6. The device for measuring and pre-concentrating volatile organic compounds in ambient air according to claim 3, wherein the ten-way valve is communicated with the second gas path, the third gas path and the fourth gas path; when the ten-way valve is in a reset state, the second gas path is communicated with the quantitative ring through the ten-way valve, the third gas path is communicated with the first analyzer through the ten-way valve, and the fourth gas path is communicated with the third analyzer through the ten-way valve; when the ten-way valve is in the valve-switching state, the second gas path is communicated with the evacuation port through the ten-way valve, the third gas path is communicated with the first analyzer through the ten-way valve, and the fourth gas path is communicated with the second analyzer through the ten-way valve.
7. The device for determining and pre-concentrating volatile organic compounds in ambient air according to claim 1, wherein the six-way valve is communicated with the first gas path, the second gas path and the enrichment analysis module; when the six-way valve is in a reset state, the first gas path is communicated with the exhaust port, and the second gas path is communicated with the enrichment analysis module through the six-way valve; when the six-way valve is in the valve-switching state, the first gas path is communicated with the enrichment analysis module through the six-way valve, and the second gas path is connected with the second electromagnetic valve through the six-way valve.
8. The apparatus according to claim 1, wherein a second solenoid valve is disposed between the six-way valve and the ten-way valve.
9. The apparatus according to claim 1, wherein the cold trap is enriched by using an adsorption tube filled with adsorbents, the adsorbents are combined into carbon pack C, carbon pack B and carbon pack 1000, and the lengths of the adsorbents are 13mm, 25mm and 13mm, respectively.
10. The application of the device for measuring the volatile organic compounds in the ambient air according to any one of claims 1 to 9, wherein the device for measuring the pre-concentration is used for cooling, enriching, heating, resolving, sample conveying (quantifying and/or analyzing) and purging the sample.
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| CN202110207056.4A CN113029744A (en) | 2021-02-24 | 2021-02-24 | Device for determining and pre-concentrating volatile organic compounds in ambient air and application |
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| CN202110207056.4A CN113029744A (en) | 2021-02-24 | 2021-02-24 | Device for determining and pre-concentrating volatile organic compounds in ambient air and application |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113960217A (en) * | 2021-11-23 | 2022-01-21 | 朗析仪器（上海）有限公司 | Method and system for measuring content of gas components in fuel hydrogen |
| CN119064513A (en) * | 2024-11-04 | 2024-12-03 | 四川省成都生态环境监测中心站 | A method for monitoring semi-volatile organic compounds in ambient air and exhaust gas |
-
2021
- 2021-02-24 CN CN202110207056.4A patent/CN113029744A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113960217A (en) * | 2021-11-23 | 2022-01-21 | 朗析仪器（上海）有限公司 | Method and system for measuring content of gas components in fuel hydrogen |
| CN119064513A (en) * | 2024-11-04 | 2024-12-03 | 四川省成都生态环境监测中心站 | A method for monitoring semi-volatile organic compounds in ambient air and exhaust gas |
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Application publication date: 20210625 |