CN113325121A - Volatile organic compound on-line measuring device - Google Patents
Volatile organic compound on-line measuring device Download PDFInfo
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- CN113325121A CN113325121A CN202110061070.8A CN202110061070A CN113325121A CN 113325121 A CN113325121 A CN 113325121A CN 202110061070 A CN202110061070 A CN 202110061070A CN 113325121 A CN113325121 A CN 113325121A
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- way valve
- volatile organic
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- organic compound
- detection device
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- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 35
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 238000001179 sorption measurement Methods 0.000 claims description 31
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 18
- 229910052782 aluminium Inorganic materials 0.000 claims description 18
- 230000017525 heat dissipation Effects 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000005057 refrigeration Methods 0.000 claims description 12
- 239000004065 semiconductor Substances 0.000 claims description 12
- 238000004587 chromatography analysis Methods 0.000 claims 2
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 12
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000012827 research and development Methods 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 16
- 239000012080 ambient air Substances 0.000 description 11
- 238000004458 analytical method Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- 239000007788 liquid Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 6
- 238000005070 sampling Methods 0.000 description 5
- 239000003570 air Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 231100000243 mutagenic effect Toxicity 0.000 description 1
- 230000003505 mutagenic effect Effects 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 231100000167 toxic agent Toxicity 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
- 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
-
- 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
- G01N30/62—Detectors specially adapted therefor
- G01N30/64—Electrical detectors
- G01N30/68—Flame ionisation detectors
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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)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
The invention relates to a volatile organic compound online detection device which comprises a first six-way valve, a second six-way valve, a first chromatographic column, a second chromatographic column, a first enrichment module, a second enrichment module, a first detector, a second detector, a first flow controller and a second flow controller. The invention has good stability of research and development, simple and convenient operation and easy maintenance, can effectively realize on-line continuous automatic monitoring and has important significance for monitoring the quality of the atmospheric environment.
Description
Technical Field
The invention relates to a detection device, in particular to an online detection device for volatile organic compounds, and particularly relates to online detection analysis and a using method thereof for volatile organic compounds in ambient air.
Background
It is well known that environmental Volatile Organic Compounds (VOCs) cause various health or environmental problems because they directly and indirectly affect people and are exposed to toxic compounds in the air, some of which, such as benzene or 1, 3-butadiene, are actually known or suspected to have carcinogenic and mutagenic properties to humans, and then, they play an important role in a complex photochemical mechanism together with nitrogen oxides, leading to the formation of secondary harmful compounds, such as ozone or peroxyacyl nitrates, in the near-surface atmosphere. The volatile organic compound is mainly composed of C12 (C)12) Has become a strong demand for continuous monitoring of volatile organic compounds in the atmosphere (NMHC).
In the existing various analysis methods for VOCs, the offline method based on the air pumping bag or the sampling tank has long time period and high cost, cannot continuously and automatically monitor volatile organic compounds in ambient air in real time, cannot capture the change of the concentration of VOCs in the ambient air in real time, and obviously cannot meet the requirements of on-site monitoring. Gas chromatography (hydrogen flame ionization detector) is currently the most widely used method for analyzing VOCs, but most of the components of VOCs in ambient air are present in trace amounts (ppb), so that samples in air need to be enriched and concentrated before analysis.
The current methods of concentration are broadly divided into three categories: physical adsorption, chemical adsorption, physical and chemical mixed adsorption. Among them, physical and chemical mixed adsorption methods, which use the peltier principle to lower the temperature electronically and match the adsorbent adsorption method, have become popular methods in recent years.
The device for continuously monitoring VOCs on site is mainly used for analyzing C2-C12A compound of formula (I), and C2-C6And C6-C12The compound needs to be monitored by two devices respectively, and one instrument can not be used for monitoring the compoundTime monitoring C2-C12A compound is provided.
The existing device for detecting the volatile organic compounds in the ambient air is large in size and complex in operation, real-time online continuous automatic analysis is not realized, the real-time concentration of key areas cannot be accurately reflected, liquid nitrogen is used for refrigeration in the prior art, liquid nitrogen needs to be frequently added, and the application condition is limited.
Disclosure of Invention
In order to solve the problems, the invention provides an online detection device for volatile organic compounds in ambient air, which solves the problems that liquid nitrogen is used for refrigeration, liquid nitrogen needs to be frequently added and the application conditions are limited in the prior art, and C is respectively concentrated by simultaneously sampling through double gas paths2-C6And C6-C12Compound, one device simultaneously to C2-C12The compound is continuously monitored on line in real time, the long-term continuous automatic operation of the online monitoring of the volatile organic compounds in the ambient air is realized, the operation is simple and convenient, and the maintenance is easy.
In order to solve the problems, the invention is realized by the following technical scheme:
the invention relates to a volatile organic compound on-line detection device, which comprises a first six-way valve, a second six-way valve, a first chromatographic column, a second chromatographic column and a first enrichment module, the first enrichment module and the first chromatographic column are arranged on a pipeline connecting the first six-way valve and the first detector, the second six-way valve is connected with the second detector through a pipeline, the second enrichment module and the second chromatographic column are arranged on a pipeline connecting the second six-way valve and the second detector, the first flow controller is connected with the first six-way valve, the second flow controller is connected with the second six-way valve, and the first six-way valve and the second six-way valve are connected with the air pump through pipelines.
The invention is further improved in that: the first enrichment module comprises a first fan, a first heat dissipation aluminum sheet and a semiconductor refrigeration sheet arranged on the first heat dissipation aluminum sheet, a first adsorption pipe is arranged on the semiconductor refrigeration sheet, the two ends of the first adsorption pipe are connected with a pipeline, a first heating wire used for heating is wrapped on the first adsorption pipe, and the first fan is installed on one side of the first heat dissipation aluminum sheet.
The invention is further improved in that: the second enrichment module comprises a second fan, a second heat dissipation aluminum sheet and a semiconductor refrigeration sheet arranged on the second heat dissipation aluminum sheet, a second adsorption tube is arranged on the semiconductor refrigeration sheet, the two ends of the second adsorption tube are connected with the pipeline, a second heating wire used for heating is wrapped on the second adsorption tube, and the second fan is installed on one side of the second heat dissipation aluminum sheet.
The invention is further improved in that: the first adsorption tube is an inert tube.
The invention is further improved in that: the second adsorption tube is an inert tube.
The invention is further improved in that: the first six-way valve and the second six-way valve are pneumatic diaphragm valves. The invention is further improved in that: the first detector and the second detector are both FID detectors.
The invention is further improved in that: the first flow controller and the second flow controller are both electronic flow controllers.
The invention is further improved in that: the pipeline is an inert pipe.
The invention has the beneficial effects that: the invention solves the problems of the prior art that the liquid nitrogen is used for refrigeration, the liquid nitrogen is required to be frequently added, the application condition is limited, the long-term continuous automatic operation of the online monitoring of the volatile organic compounds in the ambient air can be realized, the operation is simple and convenient, the maintenance is easy, the problems of ultralow temperature physical adsorption, high cost and complex operation in the prior art are solved, the high-efficiency adsorption and the rapid analysis of the sample gas can be realized by using a Peltier electronic cooling and matching adsorbent method, the problem of detecting the types of VOCs by using a plurality of detectors such as FID, PID and MSD in the prior art is solved, and the C can be simultaneously analyzed by one detector by using a double-column detector and a double-FID detector2-C12A compound is provided.
The invention has good stability of research and development, high sensitivity, simple and convenient operation and easy maintenance, can effectively realize on-line continuous automatic monitoring and has important significance for monitoring the quality of the atmospheric environment.
Drawings
FIG. 1 is a schematic diagram of a sampling state structure of the on-line detection device of the present invention.
FIG. 2 is a schematic diagram of the analysis state structure of the on-line detection device of the present invention.
FIG. 3 is a schematic diagram of a first enrichment module of the present invention.
Detailed Description
In the following description, for purposes of explanation, numerous implementation details are set forth in order to provide a thorough understanding of the embodiments of the invention. It should be understood, however, that these implementation details are not to be interpreted as limiting the invention. That is, in some embodiments of the invention, such implementation details are not necessary. In addition, some conventional structures and components are shown in simplified schematic form in the drawings.
The invention relates to a volatile organic compound online detection device, which comprises a first six-way valve V1, a second six-way valve V2, a first chromatographic column 3, a second chromatographic column 4, a first enrichment module 1, a second enrichment module 2, a first detector 5, a second detector 6, a first flow controller 8 and a second flow controller 9, wherein the first six-way valve V1 is connected with the second six-way valve V2 through a pipeline, the first six-way valve V1 is connected with the first detector 5 through a pipeline, the first enrichment module 1 and the first chromatographic column 3 are arranged on a pipeline connecting the first six-way valve V1 with the first detector 5, the second six-way valve V2 is connected with the second detector 6 through a pipeline, the second enrichment module 2 and the second chromatographic column 4 are arranged on a pipeline connecting the second six-way valve V2 with the second detector 6, the first flow controller 8 is connected with a first six-way valve V1, the second flow controller 9 is connected with a second six-way valve V2, and the first six-way valve V1 and the second six-way valve V2 are connected with the suction pump 7 through pipelines.
The first enrichment module 1 comprises a first fan 1-5, a first heat-radiating aluminum sheet 1-1 and a semiconductor refrigerating sheet 1-2 arranged on the first heat-radiating aluminum sheet 1-1, the semiconductor refrigerating sheet 1-2 is provided with a first adsorption pipe 1-3, two ends of the first adsorption pipe 1-3 are connected with a pipeline, the first adsorption pipe 1-3 is wrapped with a first heating wire 1-4 for heating, the first fan 1-5 is arranged on one side of the first heat-radiating aluminum sheet 1-1, the first enrichment module and the second enrichment module have the same structure, namely the second enrichment module 2 comprises a second fan, a second heat-radiating aluminum sheet and a semiconductor refrigerating sheet arranged on the second heat-radiating aluminum sheet, and the semiconductor refrigerating sheet is provided with a second adsorption pipe, the two ends of the second adsorption pipe are connected with a pipeline, a second heating wire used for heating is wrapped on the second adsorption pipe, the second fan is installed on one side of the second heat dissipation aluminum sheet, the first adsorption pipe 1-3, the second adsorption pipe and the pipeline are both inert pipes, sample gas is prevented from being adsorbed in the transmission process, the first six-way valve V1 and the second six-way valve V2 are pneumatic diaphragm valves, the six-way valves have an initial state and a load state, the first detector 5 and the second detector 6 are both FID detectors, and the first flow controller 8 and the second flow controller 9 are both electronic flow controllers.
The sample gas 11 enters a first six-way valve V1, a first enrichment module 1, a second six-way valve V2, a second enrichment module 2, a first chromatographic column 3, a second chromatographic column 4, a first detector 5 and a second detector 6 through an electromagnetic valve 10 to detect the volatile organic compounds.
The first enrichment module and the second enrichment module can determine the performance of the enrichment modules according to the detected substances,
in the embodiment, the first enrichment module is a high-performance enrichment module, the temperature can be reduced to-30 ℃, the heating rate can reach 100 ℃/s, and the second enrichment module is a common enrichment module.
The invention relates to an online detection device for volatile organic compounds in ambient air, the sampling state of the device is shown as the attached figure 1, and the specific sampling state flow is as follows: the sample gas 11 passes through the solenoid valve 10, wherein the solenoid valve 10 is in an open state, and then enters the first six-way valve V1, the second six-way valve V2, the first six-way valve V1, and the second six-way valve V2 in an initial state, and then enters the first enrichment module 1, the second enrichment module 2, and finally is discharged through the suction pump 7.
The invention relates to an online detection device for volatile organic compounds in ambient air, the analysis state of the device is shown as the attached figure 2, and the specific analysis state flow is as follows: the first six-way valve V1 and the second six-way valve V2 are in a load state, the first flow controller 8 and the second flow controller 9 carry the sample gas 11 in the first enrichment module 1 and the second enrichment module 2 into the first chromatographic column 3 and the second chromatographic column 4 for separation, and the separated sample gas respectively enters the first detector 5 and the second detector 6 to realize the analysis of the content of different components in the sample gas.
The invention solves the problems that the prior art uses liquid nitrogen for refrigeration, needs to frequently add liquid nitrogen and has limited application conditions, can realize long-term continuous automatic operation of online monitoring of volatile organic compounds in ambient air, and has simple and convenient operation and easy maintenance.
The above description is only an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (9)
1. The utility model provides a volatile organic compounds on-line measuring device, includes first six-way valve (V1), second six-way valve (V2), first chromatographic column (3), second chromatographic column (4), first enrichment module (1), second enrichment module (2), first detector (5), second detector (6), first flow controller (8), second flow controller (9), its characterized in that: the first six-way valve (V1) and the second six-way valve (V2) are connected through a pipeline, the first six-way valve (V1) is connected with the first detector (5) through a pipeline, the first enrichment module (1) and the first chromatography column (3) are arranged on the line connecting the first six-way valve (V1) and the first detector (5), the second six-way valve (V2) is connected with the second detector (6) through a pipeline, the second enrichment module (2) and the second chromatography column (4) are arranged on the pipeline connecting the second six-way valve (V2) and the second detector (6), the first flow controller (8) is connected to a first six-way valve (V1), the second flow controller (9) is connected to a second six-way valve (V2), the first six-way valve (V1) and the second six-way valve (V2) are connected with the air suction pump (7) through pipelines.
2. The online volatile organic compound detection device according to claim 1, wherein: the first enrichment module (1) comprises a first fan (1-5), a first heat dissipation aluminum sheet (1-1) and a semiconductor refrigeration sheet (1-2) arranged on the first heat dissipation aluminum sheet (1-1), a first adsorption pipe (1-3) is arranged on the semiconductor refrigeration sheet (1-2), two ends of the first adsorption pipe (1-3) are connected with a pipeline, a first heating wire (1-4) for heating is wrapped on the first adsorption pipe (1-3), and the first fan (1-5) is installed on one side of the first heat dissipation aluminum sheet (1-1).
3. The online volatile organic compound detection device according to claim 1, wherein: second enrichment module (2) include second fan, second heat dissipation aluminum sheet and set up the semiconductor refrigeration piece on second heat dissipation aluminum sheet be provided with the second adsorption tube on the semiconductor refrigeration piece, the both ends and the tube coupling of second adsorption tube the parcel has the second heater strip that is used for the heating on the second adsorption tube, the second fan is installed one side of second heat dissipation aluminum sheet.
4. The online volatile organic compound detection device according to claim 2, wherein: the first adsorption pipe (1-3) is an inert pipe.
5. The online volatile organic compound detection device according to claim 3, wherein: the second adsorption tube is an inert tube.
6. The online volatile organic compound detection device according to claim 1, wherein: the first six-way valve (V1) and the second six-way valve (V2) are pneumatic diaphragm valves.
7. The online volatile organic compound detection device according to claim 1, wherein: the first detector (5) and the second detector (6) are both FID detectors.
8. The online volatile organic compound detection device according to claim 1, wherein: the first flow controller (8) and the second flow controller (9) are both electronic flow controllers.
9. The online volatile organic compound detection device according to claim 1, wherein: the pipeline is an inert pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110061070.8A CN113325121A (en) | 2021-01-18 | 2021-01-18 | Volatile organic compound on-line measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110061070.8A CN113325121A (en) | 2021-01-18 | 2021-01-18 | Volatile organic compound on-line measuring device |
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| CN113325121A true CN113325121A (en) | 2021-08-31 |
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| CN202110061070.8A Pending CN113325121A (en) | 2021-01-18 | 2021-01-18 | Volatile organic compound on-line measuring device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804809A (en) * | 2021-09-26 | 2021-12-17 | 上海裕达实业有限公司 | Portable gas chromatography-mass spectrometer rapid temperature control device |
| CN114839003A (en) * | 2022-04-22 | 2022-08-02 | 浙江工业大学 | Multichannel VOCs sampling and atmospheric pollutants detecting system based on unmanned aerial vehicle |
| CN115876928A (en) * | 2023-01-09 | 2023-03-31 | 南京霍普斯科技有限公司 | Online detection and analysis device and analysis method for environment air malodorous substances |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202002838U (en) * | 2010-11-30 | 2011-10-05 | 中国科学院大连化学物理研究所 | Integrated online concentration and desorption device |
| CN108627604A (en) * | 2017-03-23 | 2018-10-09 | 上海炫电气有限公司 | One kind is for detecting VOCs in ambient air full constituent fexible unit |
| CN110361466A (en) * | 2019-06-28 | 2019-10-22 | 南京霍普斯科技有限公司 | Volatile organic contaminant on-line monitoring system and monitoring method in surrounding air |
| CN214334804U (en) * | 2021-01-18 | 2021-10-01 | 南京霍普斯科技有限公司 | Volatile organic compound on-line measuring device |
-
2021
- 2021-01-18 CN CN202110061070.8A patent/CN113325121A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202002838U (en) * | 2010-11-30 | 2011-10-05 | 中国科学院大连化学物理研究所 | Integrated online concentration and desorption device |
| CN108627604A (en) * | 2017-03-23 | 2018-10-09 | 上海炫电气有限公司 | One kind is for detecting VOCs in ambient air full constituent fexible unit |
| CN110361466A (en) * | 2019-06-28 | 2019-10-22 | 南京霍普斯科技有限公司 | Volatile organic contaminant on-line monitoring system and monitoring method in surrounding air |
| CN214334804U (en) * | 2021-01-18 | 2021-10-01 | 南京霍普斯科技有限公司 | Volatile organic compound on-line measuring device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804809A (en) * | 2021-09-26 | 2021-12-17 | 上海裕达实业有限公司 | Portable gas chromatography-mass spectrometer rapid temperature control device |
| CN114839003A (en) * | 2022-04-22 | 2022-08-02 | 浙江工业大学 | Multichannel VOCs sampling and atmospheric pollutants detecting system based on unmanned aerial vehicle |
| CN115876928A (en) * | 2023-01-09 | 2023-03-31 | 南京霍普斯科技有限公司 | Online detection and analysis device and analysis method for environment air malodorous substances |
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