CN112816644A - Device and method for detecting VOCs in water - Google Patents
Device and method for detecting VOCs in water Download PDFInfo
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- CN112816644A CN112816644A CN202011614418.3A CN202011614418A CN112816644A CN 112816644 A CN112816644 A CN 112816644A CN 202011614418 A CN202011614418 A CN 202011614418A CN 112816644 A CN112816644 A CN 112816644A
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- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000010926 purge Methods 0.000 claims abstract description 43
- 238000004458 analytical method Methods 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 25
- 238000005070 sampling Methods 0.000 claims description 18
- 238000001179 sorption measurement Methods 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 10
- 239000012159 carrier gas Substances 0.000 claims description 9
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 206010037544 Purging Diseases 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 208000033999 Device damage Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
- 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
-
- 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
-
- 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
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/16—Injection
- G01N30/20—Injection using a sampling valve
-
- 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
- G01N30/16—Injection
- G01N30/20—Injection using a sampling valve
- G01N2030/201—Injection using a sampling valve multiport valves, i.e. having more than two ports
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention provides a device and a method for detecting VOCs in water, wherein the device for detecting VOCs in water comprises a container for containing a water sample to be detected, an enrichment unit and an analysis instrument; the inlet of the flow controller is communicated with the purge gas, and the outlet of the flow controller is communicated with the first switching module; the first switching module is used for enabling the outlet of the flow controller to be selectively communicated with the first pipeline and the second switching module; the first pipeline is connected with the first switching module and extends into the container, one end of the second pipeline is arranged in the container, and the other end of the second pipeline is connected with the second switching module; the open end of the second pipe is positioned higher than the open end of the first pipe in the container; the second switching module is used for enabling the differential pressure sensor to be selectively communicated with the second pipeline and the first switching module; one end of the differential pressure sensor is communicated with the second switching module, and the other end of the differential pressure sensor is connected with the enrichment unit. The invention has the advantages of high sensitivity and the like.
Description
Technical Field
The invention relates to VOCs detection, in particular to a device and a method for detecting VOCs in water.
Background
The method is characterized in that a purging and trapping pretreatment technology is generally adopted for analyzing Volatile Organic Compounds (VOCs) in water, and in the application of the technology, purging flow and sampling flow need to be balanced, and the sampling flow is ensured to be less than or equal to the purging flow. However, the purge flow rate is affected by the process of manufacturing the internal flow path of the purge trap device and the adsorption tube for adsorbing VOCs, and the influence of the purge flow rate is also changed with time. When the purging flow is smaller than the sampling flow, a water sample for purging is sucked to the pipeline or even to the adsorption tube, so that serious device damage is caused. At present, no effective protective measures are provided for the defects in the technology, the purging flow is generally set to be equal to the sampling flow so as to ensure the accurate sampling rate, and early warning cannot be timely given when the sampling flow is larger than the purging flow accidentally.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a device for detecting VOCs in water.
The purpose of the invention is realized by the following technical scheme:
the detection device for the VOCs in the water comprises a container for containing a water sample to be detected, an enrichment unit and an analysis instrument; aquatic VOCs detection device still includes:
the inlet of the flow controller is communicated with the purge gas, and the outlet of the flow controller is communicated with the first switching module;
a first switching module for selectively communicating the outlet of the flow controller with the first conduit and the second switching module;
the first pipeline is connected with the first switching module and extends into the container, one end of the second pipeline is arranged in the container, and the other end of the second pipeline is connected with the second switching module; the open end of the second pipe is positioned higher than the open end of the first pipe in the container;
the second switching module is used for enabling the differential pressure sensor to be selectively communicated with the second pipeline and the first switching module;
and one end of the differential pressure sensor is communicated with the second switching module, and the other end of the differential pressure sensor is connected with the enrichment unit.
The invention also aims to provide a method for detecting VOCs in water, which is realized by the following technical scheme:
the method for detecting the VOCs in the water comprises a sampling stage, wherein the sampling stage comprises the following steps:
the purge gas enters the water surface of the container after being controlled by the flow, and VOCs in the water escapes from the water surface;
the VOCs escaping from the water surface are sent out of the container and then sent to an adsorption pipe in the enrichment unit;
comparing the flow of the purge gas and the flow of the VOCs;
and if the flow of the purging gas is less than the flow of the VOCs, giving out early warning.
Compared with the prior art, the invention has the beneficial effects that:
1. the safety is good;
in the sampling stage, the purging gas flow and the VOCs flow are compared in real time, and an early warning prompt is given according to the comparison result, so that a water sample is effectively prevented from entering an enrichment unit, the safety is improved, and the damage of a device is avoided;
2. the sensitivity is high;
the flow path design of the differential pressure sensor is adopted, the deviation signals of the purging flow and the VOCs flow can be fed back in real time, so that the balance of the purging flow and the VOCs flow is guaranteed, the purged VOCs are maximally adsorbed and captured, and the sensitivity of the instrument is improved.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only for illustrating the technical solutions of the present invention and are not intended to limit the scope of the present invention. In the figure:
fig. 1 is a schematic structural diagram of a device for detecting VOCs in water according to an embodiment of the present invention.
Detailed Description
Fig. 1 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. Some conventional aspects have been simplified or omitted for the purpose of teaching the present invention. Those skilled in the art will appreciate that variations or substitutions from these embodiments will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.
Example 1:
fig. 1 is a schematic structural diagram of an apparatus for detecting VOCs in water according to an embodiment of the present invention, and as shown in fig. 1, the apparatus for detecting VOCs in water includes:
the device comprises a container for containing a water sample to be detected, an enrichment unit and an analytical instrument; these components are all prior art in the field;
the inlet of the flow controller is communicated with the purge gas, and the outlet of the flow controller is communicated with the first switching module;
a first switching module for selectively communicating the outlet of the flow controller with the first conduit and the second switching module;
the first pipeline is connected with the first switching module and extends into the container, one end of the second pipeline is arranged in the container, and the other end of the second pipeline is connected with the second switching module; the open end of the second pipe is positioned higher than the open end of the first pipe in the container;
the second switching module is used for enabling the differential pressure sensor to be selectively communicated with the second pipeline and the first switching module;
and one end of the differential pressure sensor is communicated with the second switching module, and the other end of the differential pressure sensor is connected with the enrichment unit.
In order to realize the enrichment of the VOCs to improve the detection sensitivity, further, the enrichment unit comprises:
the port of the multi-way valve is communicated with the differential pressure sensor, the carrier gas, the analyzer, two ends of the adsorption tube and the pump; when the multi-way valve is switched, one end of the adsorption tube is selectively communicated with the carrier gas and the differential pressure sensor, and the other end of the adsorption tube is selectively communicated with the analysis instrument and the pump.
In order to close and open the purge gas, further, the apparatus for detecting VOCs in water further comprises:
a valve disposed upstream of the flow controller.
In order to quantify the carrier gas, the carrier gas port of the multi-way valve is communicated with a flow controller and a valve in sequence.
The detection method of the VOCs in the water comprises a sampling stage, wherein the sampling stage comprises the following steps:
the purge gas enters the water surface of the container after being controlled by the flow, and VOCs in the water escapes from the water surface;
the VOCs escaping from the water surface are sent out of the container and then sent to an adsorption pipe in the enrichment unit;
comparing the flow of the purge gas and the flow of the VOCs;
and if the flow of the purging gas is less than the flow of the VOCs, giving out early warning.
In order to realize the flow control, further, in the sampling stage, the flow-controlled purge gas enters the container after passing through the first switching module;
VOCs of the output container passes through the second switching module and then sequentially passes through the differential pressure sensor and the adsorption tube.
In order to send the residual VOCs in the pipeline to the adsorption pipe, further, the method for detecting the VOCs in the water further comprises a purging stage, wherein the purging stage comprises:
the first switching module and the second switching module are switched, and the purge gas sequentially passes through the first switching module and the second switching module to bring residual VOCs in the pipeline into the enrichment unit.
Example 2:
the invention provides an application example of the detection device and method for VOCs in water according to embodiment 1.
In this application example, as shown in fig. 1, the valve, the flow controller, and the first switching module are connected in sequence; the first switching module and the second switching module adopt two-position three-way valves; the multi-way valve adopts a six-way valve, and six ports are respectively connected with two ends of the differential pressure sensor, the carrier gas, the analyzer, the pump and the adsorption tube; the carrier gas port is sequentially connected with the flow controller and the valve; the analytical instrument employs a gas chromatograph.
The detection method of the VOCs in the water comprises a sampling stage and a purging stage, wherein the sampling stage comprises the following steps:
the valve is opened, the first switching module, the second switching module and the multi-way valve are switched, the purge gas is controlled by the flow and then sequentially passes through the first switching module and the first pipeline, the purge gas enters the water surface of the container, and VOCs in the water escape from the water surface;
under the pumping of the pump, the VOCs escaping from the water surface are collected by a second pipeline above the water surface, are sent out of the container, pass through a second switching module and a differential pressure sensor, and are then sent to an adsorption tube in the enrichment unit;
the pressure difference sensor compares the flow of the purge gas and the flow of the VOCs;
if the flow of the purging gas is smaller than that of the VOCs, an early warning is sent out;
in order to realize the flow control, further, in the sampling stage, the flow-controlled purge gas enters the container after passing through the first switching module;
the purge phase comprises:
the first switching module and the second switching module are switched, the purge gas after flow control sequentially passes through the first switching module and the second switching module (does not enter a first pipeline and a container any more), and residual VOCs in the pipeline are brought into the enrichment unit
The desorption and injection stages are prior art in the field and will not be described further herein.
Claims (7)
1. The detection device for the VOCs in the water comprises a container for containing a water sample to be detected, an enrichment unit and an analysis instrument; its characterized in that, aquatic VOCs detection device still includes:
the inlet of the flow controller is communicated with the purge gas, and the outlet of the flow controller is communicated with the first switching module;
a first switching module for selectively communicating the outlet of the flow controller with the first conduit and the second switching module;
the first pipeline is connected with the first switching module and extends into the container, one end of the second pipeline is arranged in the container, and the other end of the second pipeline is connected with the second switching module; the open end of the second pipe is positioned higher than the open end of the first pipe in the container;
the second switching module is used for enabling the differential pressure sensor to be selectively communicated with the second pipeline and the first switching module;
and one end of the differential pressure sensor is communicated with the second switching module, and the other end of the differential pressure sensor is connected with the enrichment unit.
2. The apparatus of claim 1, wherein the enrichment unit comprises:
the port of the multi-way valve is communicated with the differential pressure sensor, the carrier gas, the analyzer, two ends of the adsorption tube and the pump; when the multi-way valve is switched, one end of the adsorption tube is selectively communicated with the carrier gas and the differential pressure sensor, and the other end of the adsorption tube is selectively communicated with the analysis instrument and the pump.
3. The apparatus of claim 1, further comprising:
a valve disposed upstream of the flow controller.
4. An in-water VOCs detection apparatus as claimed in claim 2, wherein the carrier gas port of the multi-way valve is in communication with a flow controller and a valve in sequence.
5. The method for detecting the VOCs in the water comprises a sampling stage, wherein the sampling stage comprises the following steps:
the purge gas enters the water surface of the container after being controlled by the flow, and VOCs in the water escapes from the water surface;
the VOCs escaping from the water surface are sent out of the container and then sent to an adsorption pipe in the enrichment unit;
comparing the flow of the purge gas and the flow of the VOCs;
and if the flow of the purging gas is less than the flow of the VOCs, giving out early warning.
6. The method according to claim 5, wherein in the sampling stage, the flow-controlled purge gas enters the container after passing through the first switching module;
VOCs of the output container passes through the second switching module and then sequentially passes through the differential pressure sensor and the adsorption tube.
7. The method of claim 6, further comprising a purge stage, the purge stage comprising:
the first switching module and the second switching module are switched, and the purge gas sequentially passes through the first switching module and the second switching module to bring residual VOCs in the pipeline into the enrichment unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011614418.3A CN112816644A (en) | 2020-12-31 | 2020-12-31 | Device and method for detecting VOCs in water |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011614418.3A CN112816644A (en) | 2020-12-31 | 2020-12-31 | Device and method for detecting VOCs in water |
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| CN112816644A true CN112816644A (en) | 2021-05-18 |
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| CN202011614418.3A Pending CN112816644A (en) | 2020-12-31 | 2020-12-31 | Device and method for detecting VOCs in water |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514610A (en) * | 2021-06-25 | 2021-10-19 | 杭州谱育科技发展有限公司 | VOCs detection calibration device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113514610A (en) * | 2021-06-25 | 2021-10-19 | 杭州谱育科技发展有限公司 | VOCs detection calibration device and method |
| CN113514610B (en) * | 2021-06-25 | 2023-08-04 | 杭州谱育科技发展有限公司 | Calibration device and method for VOCs detection |
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