CN111766357A - System and method for continuously and automatically monitoring VOCs in water - Google Patents
System and method for continuously and automatically monitoring VOCs in water Download PDFInfo
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- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 238000012544 monitoring process Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000010926 purge Methods 0.000 claims abstract description 63
- 238000000926 separation method Methods 0.000 claims abstract description 53
- 239000007789 gas Substances 0.000 claims abstract description 50
- 238000005070 sampling Methods 0.000 claims abstract description 37
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 238000001704 evaporation Methods 0.000 claims abstract description 12
- 230000008020 evaporation Effects 0.000 claims abstract description 12
- 239000012159 carrier gas Substances 0.000 claims abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 239000002699 waste material Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000003795 desorption Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 238000000265 homogenisation Methods 0.000 claims description 2
- 239000000284 extract Substances 0.000 abstract 1
- 238000005057 refrigeration Methods 0.000 description 3
- 238000002161 passivation Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
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- 230000014759 maintenance of location Effects 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1826—Organic contamination in water
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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
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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
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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
- G01N1/405—Concentrating samples by adsorption or absorption
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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
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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
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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
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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
- G01N30/12—Preparation by evaporation
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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
- G01N30/14—Preparation by elimination of some components
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- 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
- G01N30/12—Preparation by evaporation
- G01N2030/126—Preparation by evaporation evaporating sample
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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
- G01N30/14—Preparation by elimination of some components
- G01N2030/146—Preparation by elimination of some components using membranes
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Abstract
The invention discloses a continuous automatic monitoring system and a monitoring method for VOCs in water, wherein the monitoring system comprises a sample introduction system, a purging system, a second multi-way valve set, an enrichment system, a separation system and a detection system, during monitoring, a sampling pump extracts a water sample into the purging system, two three-way valves are switched to be in a state of being communicated with the second multi-way valve set, an MFC controls purging gas to purge the water sample in a purging pipe so as to separate gas and liquid, gaseous VOCs enter the enrichment pipe to be enriched, the second multi-way valve set is switched to be in a sample introduction state, simultaneously, an extreme flash evaporation mode of the enrichment system is started, organic matters are brought into the separation system to be separated under the purging of carrier gas, and finally the organic matters are detected in the detection system. So that the monitoring results are well representative of the emission levels of the daily VOCs.
Description
Technical Field
The invention relates to the field of water environment monitoring, in particular to a system and a method for continuously and automatically monitoring VOCs in water.
Background
Most Volatile Organic Compounds (VOCs) are toxic and even strong carcinogens, and have great harm to the environment and human bodies. The sources of VOCs in water are wide, and mainly comprise industrial discharge, accident leakage and the like. At present, VOCs monitoring and treatment are mainly concentrated on the ambient air part, VOCs in water are still few, and the content of volatile organic compounds in an environmental water body is low, so that direct determination of the VOCs is extremely difficult, and a proper sample pretreatment method needs to be selected for separation and enrichment, so that the detection limit of an analytical instrument is reached.
At present, the content of VOCs in water is mostly determined by adopting a laboratory analysis mode, but the mode is easily influenced by weather and human, the analysis period is long, and the pollution condition of daily water bodies cannot be well reflected.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a system and a method for continuously and automatically monitoring VOCs in water, wherein the monitoring system can realize on-line monitoring so as to obtain real-time accurate monitoring data, so that the monitoring result can well represent the discharge level of daily VOCs.
The technical scheme adopted by the invention for solving the technical problems is as follows: a continuous automatic monitoring system for VOCs in water, comprising:
the sampling system comprises a sampling pump and a first multi-way valve group, wherein the sampling pump is used for extracting and sampling a water sample, a standard sample and a zero sample through the first multi-way valve group and discharging waste liquid through the first multi-way valve group;
the purging system is arranged between a sampling pump of the sampling system and the first multi-way valve group, so that the water sample, the standard sample and the zero sample enter the purging system under the pumping action of the sampling pump, and the water sample purges and separates VOCs gas contained in the water sample through the purging system;
the second multi-way valve group is connected to a rear-stage pipeline of the purging system;
an enrichment system connected between the plurality of legs of the second manifold block;
a separation system connected between the plurality of legs of the second manifold block;
and the detection system is connected in a post pipeline of the separation system.
Optionally, the purge system comprises:
the gas source is used for providing gas power for gas-liquid separation;
a mass flow meter for controlling the flow of the gas source;
the gas distributor is used for carrying out homogenization treatment on the gas provided by the gas source.
Optionally, the sample injection system further comprises:
the two-position three-way valve is arranged in a pipeline between the purging system and the second multi-way valve group, two connecting ports of the two-position three-way valve are respectively connected with the purging system and the second multi-way valve group through pipelines, and the other connecting port of the two-position three-way valve is connected with the sampling pump.
Optionally, a water removal module is further connected to the foreline of the second multi-way valve group.
Optionally, the water removal module is disposed in a pipeline between the second multi-way valve set and the two-position three-way valve.
Optionally, the separation system includes a pre-separation column and a main separation column, the pre-separation column is disposed at a front stage of the main separation column, and a rear stage of the main separation column is connected to the detection system.
By adopting the technical scheme, the continuous and automatic monitoring system for the VOCs in the water effectively reduces the labor use cost, and integrates the pretreatment and the analyzer into a cabinet, so that the monitoring system has the functions of equipment control and data acquisition and processing. The equipment has the advantages of simple operation, full automation, stable long-term function and less maintenance, and replaces manual sampling monitoring with online monitoring to obtain real-time accurate monitoring data, so that the monitoring result can well represent the emission level of the daily VOCs.
Accordingly, the invention also provides a method for continuously and automatically monitoring the VOCs in the water, which comprises the following steps:
switching the two-position three-way valve to connect the sampling pump and the purging system;
starting a sampling pump, and extracting a quantitative water sample into a purging system through the sampling pump and a first multi-way valve group for storage;
switching a two-position three-way valve, connecting the purging system and the second multi-way valve group, and switching the second multi-way valve group to a state that the purging system is communicated with the enrichment system;
starting a purging system, blowing gas of a gas source to a water sample through the purging system to enable VOCs in the water sample to be separated from the water sample, and meanwhile, under the purging effect of the gas source, allowing the VOCs gas purged from the water sample to enter an enrichment system after passing through a second multi-way valve group, and enriching the VOCs gas in the enrichment system;
after VOCs gas is enriched, switching the second multi-way valve group to a sample introduction state, simultaneously starting the rapid flash evaporation of the enrichment system to desorb VOCs organic matters from the enrichment system, introducing carrier gas into the second multi-way valve group, and pushing the VOCs organic matters subjected to flash evaporation desorption from the enrichment system to a separation system under the flowing of the carrier gas;
in the separation system, firstly, pre-separating the VOCs by a pre-separation column, and then, carrying out main separation by a main separation column to separate the VOCs;
and the separated VOSs organic matters are sequentially detected by a detection system.
Optionally, when the purging system performs gas-liquid separation, the gas source is a nitrogen source, and the purging time lasts for 11 min.
Optionally, when the purging system performs gas-liquid separation, the flow rate of the purged gas is 40 ml/min.
Optionally, the enrichment system is maintained for 2min when performing extreme flash evaporation.
By the automatic monitoring method, online monitoring is realized, so that real-time accurate monitoring data are obtained, and the monitoring result can well represent the emission level of daily VOCs.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in figure 1, the invention discloses a continuous and automatic monitoring system for VOCs in water, which combines automatic sampling, sample pretreatment and sample analysis and detection into a set of devices, eliminates the uncertainty of manual sampling, and can work for a long time, so that the monitoring result can well represent the emission level of daily VOCs. Specifically, the monitoring system comprises a sample introduction system, a purging system, a second multi-way valve group 3, an enrichment system 4, a separation system and a detection system.
Wherein, sampling system includes sampling pump 1 and first multi-port valve group 2, and sampling pump 1 can select to use syringe pump or peristaltic pump, and sampling pump 1 draws water sample, trade sample, zero appearance through first multi-port valve group 2 and advances kind to discharge the waste liquid through first multi-port valve group. Therefore, in the first multi-way valve set 2, five electromagnetic valves are provided, which are a water sample valve, a standard sample valve, a zero sample valve, a waste discharge valve and a main valve, wherein the main valve is respectively communicated with the water sample valve, the standard sample valve, the zero sample valve and the waste discharge valve, and the main valve is also communicated with the purging system.
The purging system is arranged between the sampling pump 1 of the sampling system and the first multi-way valve group 2, so that a water sample, a standard sample and a zero sample enter the purging system under the extraction effect of the sampling pump 1, the water sample purges and separates VOCs gas contained in the water sample through the purging system, and the second multi-way valve group 3 is connected in a back-stage pipeline of the purging system.
The second multi-way valve group 3 adopts a pneumatic switching ten-way valve, and passivation treatment is carried out inside the valve.
The enrichment system 4 comprises an enrichment pipe, a refrigeration element and a flash evaporation element, wherein the enrichment pipe is a 3mm stainless steel pipe, the inside of the enrichment pipe is subjected to passivation treatment, a Tenax or carbon material adsorbent is filled in the enrichment pipe, the outer wall of the enrichment pipe is wound with an insulating and heat conducting material, the refrigeration element adopts multistage Peltier electronic refrigeration, the flash evaporation element is a heater, and the heater directly heats the enrichment pipe. The enrichment system is connected between the branches of the second multi-way valve block 3.
The separation system comprises a pre-separation column 5 and a main separation column 6, wherein the separation column 5 and the main separation column 6 both adopt chromatographic columns, the chromatographic columns adopt DB-1 or HP-5 stainless steel capillary chromatographic columns, the pre-separation column 5 is arranged at the front stage of the main separation column 6, the rear stage of the main separation column 6 is connected with a detection system, and the separation system is connected among a plurality of branches of the second multi-way valve group 2.
The detection system is connected in the post-stage pipeline of the separation system, and the detection system can adopt a hydrogen ion flame detector 12.
In the present invention, the purge system comprises:
and the gas source 7 is used for providing gas power for gas-liquid separation.
The mass flow meter 8 is used for controlling the flow of the air source;
and the gas distributor 9 is used for homogenizing the gas provided by the gas source 7 through the gas distributor 9.
Wherein, the gas source 7 adopts a nitrogen source, and the mass flow meter 8 adopts MFC gas flow control.
In the invention, the sample injection system further comprises a two-position three-way valve 10, the two-position three-way valve 10 is arranged in a pipeline between the purging system and the second multi-way valve group 3, two connecting ports of the two-position three-way valve 10 are respectively connected with the purging system and the second multi-way valve group 3 through pipelines, and the other connecting port of the two-position three-way valve 10 is connected with the sampling pump 1.
Still be connected with dewatering module 11 in the fore-line of the group valve 3 that leads to in the second, dewatering module 11 adopts the pellicle to remove the water pipe for detach the aqueous vapor that remains in the VOCs gas, dewatering module 11 is located in the second leads to the group valve 3 and the pipeline between two three-way valves 10 that leads to between.
The invention provides a method for continuously and automatically monitoring VOCs in water according to the monitoring system, which comprises the following steps:
switching the two-position three-way valve 10 to connect the sampling pump 1 and the purging system through the two-position three-way valve 10;
starting a sampling pump 1, and pumping a quantitative water sample into a purging system for storage through the sampling pump 1 and a first multi-way valve group 2;
switching the two-position three-way valve 10, communicating the purging system with the second multi-way valve group 3, and switching the second multi-way valve group 3 to a state that the purging system is communicated with the enrichment system 4;
starting a purging system, blowing the gas of the gas source 7 to the water sample through the purging system to enable the VOCs in the water sample to be separated from the water sample, and meanwhile, under the purging effect of the gas source 7, allowing the VOCs gas purged from the water sample to enter the enrichment system 4 after passing through the second multi-way valve group 3, and enriching the VOCs gas in the enrichment system 4;
after VOCs gas is enriched, the second multi-way valve group 3 is switched to a sample introduction state, meanwhile, the enrichment system 4 starts the rapid flash evaporation to desorb VOCs organic matters from the enrichment system 4, then carrier gas is introduced into the second multi-way valve group 3, and under the flowing of the carrier gas, the VOCs organic matters desorbed from the enrichment system 4 by flash evaporation are pushed to a separation system;
in the separation system, VOCs organic matters are firstly pre-separated through a pre-separation column 5 and then are primarily separated through a primary separation column 6, so that the VOCs organic matters are separated;
and the separated VOSs organic matters are sequentially detected by a detection system.
In the monitoring method, when the purging system performs gas-liquid separation, the gas source 7 is a nitrogen source, the purging time lasts for 11min, and the purged gas flow is 40 ml/min. The retention time of the enrichment system 4 is 2min when the ultra-fast flash evaporation is carried out.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Other technical features than those described in the specification are known to those skilled in the art, and are not described herein in detail in order to highlight the innovative features of the present invention.
Claims (10)
1. A continuous automatic monitoring system for VOCs in water is characterized by comprising
The sampling system comprises a sampling pump and a first multi-way valve group, wherein the sampling pump is used for extracting and sampling a water sample, a standard sample and a zero sample through the first multi-way valve group and discharging waste liquid through the first multi-way valve group;
the purging system is arranged between a sampling pump of the sampling system and the first multi-way valve group, so that the water sample, the standard sample and the zero sample enter the purging system under the pumping action of the sampling pump, and the water sample purges and separates VOCs gas contained in the water sample through the purging system;
the second multi-way valve group is connected to a rear-stage pipeline of the purging system;
an enrichment system connected between the plurality of legs of the second manifold block;
a separation system connected between the plurality of legs of the second manifold block;
and the detection system is connected in a post pipeline of the separation system.
2. The system for continuous, automatic monitoring of in-water VOCs of claim 1, wherein the purge system comprises:
the gas source is used for providing gas power for gas-liquid separation;
a mass flow meter for controlling the flow of the gas source;
the gas distributor is used for carrying out homogenization treatment on the gas provided by the gas source.
3. The system according to claim 1, wherein the sample injection system further comprises:
the two-position three-way valve is arranged in a pipeline between the purging system and the second multi-way valve group, two connecting ports of the two-position three-way valve are respectively connected with the purging system and the second multi-way valve group through pipelines, and the other connecting port of the two-position three-way valve is connected with the sampling pump.
4. The system according to claim 3, wherein a water removal module is further connected to the foreline of the second manifold block.
5. The system of claim 4, wherein the water removal module is disposed in a conduit between the second multi-way valve set and the two-position three-way valve.
6. The system according to claim 5, wherein the separation system comprises a pre-separation column and a main separation column, the pre-separation column is disposed at a front stage of the main separation column, and a rear stage of the main separation column is connected to the detection system.
7. A continuous automatic monitoring method for VOCs in water is characterized by comprising the following steps:
switching the two-position three-way valve to connect the sampling pump and the purging system;
starting a sampling pump, and extracting a quantitative water sample into a purging system through the sampling pump and a first multi-way valve group for storage;
switching a two-position three-way valve, connecting the purging system and the second multi-way valve group, and switching the second multi-way valve group to a state that the purging system is communicated with the enrichment system;
starting a purging system, blowing gas of a gas source to a water sample through the purging system to enable VOCs in the water sample to be separated from the water sample, and meanwhile, under the purging effect of the gas source, allowing the VOCs gas purged from the water sample to enter an enrichment system after passing through a second multi-way valve group, and enriching the VOCs gas in the enrichment system;
after VOCs gas is enriched, switching the second multi-way valve group to a sample introduction state, simultaneously starting the rapid flash evaporation of the enrichment system to desorb VOCs organic matters from the enrichment system, introducing carrier gas into the second multi-way valve group, and pushing the VOCs organic matters subjected to flash evaporation desorption from the enrichment system to a separation system under the flowing of the carrier gas;
in the separation system, firstly, pre-separating the VOCs by a pre-separation column, and then, carrying out main separation by a main separation column to separate the VOCs;
and the separated VOSs organic matters are sequentially detected by a detection system.
8. The method according to claim 7, wherein the purging system is used for gas-liquid separation, the gas source is a nitrogen source, and the purging time lasts for 11 min.
9. The method according to claim 8, wherein the purging system is configured to perform the gas-liquid separation at a purge gas flow rate of 40 ml/min.
10. The gas-liquid separation in a purge system according to claim 7, wherein the enrichment system is maintained for 2min during the extreme flash evaporation.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112816644A (en) * | 2020-12-31 | 2021-05-18 | 杭州谱育科技发展有限公司 | Device and method for detecting VOCs in water |
| CN112816272A (en) * | 2020-12-30 | 2021-05-18 | 杭州谱育科技发展有限公司 | Gas enrichment method and device |
| CN113533599A (en) * | 2021-07-31 | 2021-10-22 | 杭州谱育科技发展有限公司 | Underwater SVOCs analysis device and method |
| CN113917054A (en) * | 2021-09-29 | 2022-01-11 | 苏州天蓝分析仪器有限公司 | Device for automatically measuring atmosphere trace-level VOC (volatile organic compound) components |
| CN114216952A (en) * | 2021-12-15 | 2022-03-22 | 中国人民解放军96901部队23分队 | Method for measuring tritium content in air |
| CN115326461A (en) * | 2022-08-04 | 2022-11-11 | 安徽省生态环境科学研究院 | Contaminated plot sampling and enriching system |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113533599A (en) * | 2021-07-31 | 2021-10-22 | 杭州谱育科技发展有限公司 | Underwater SVOCs analysis device and method |
| CN113917054A (en) * | 2021-09-29 | 2022-01-11 | 苏州天蓝分析仪器有限公司 | Device for automatically measuring atmosphere trace-level VOC (volatile organic compound) components |
| CN114216952A (en) * | 2021-12-15 | 2022-03-22 | 中国人民解放军96901部队23分队 | Method for measuring tritium content in air |
| CN114216952B (en) * | 2021-12-15 | 2023-10-31 | 中国人民解放军96901部队23分队 | Method for measuring tritium content in air |
| CN115326461A (en) * | 2022-08-04 | 2022-11-11 | 安徽省生态环境科学研究院 | Contaminated plot sampling and enriching system |
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