CN104597154A - Device and method for detecting VOC (volatile organic compound) in liquid - Google Patents
Device and method for detecting VOC (volatile organic compound) in liquid Download PDFInfo
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- CN104597154A CN104597154A CN201510010051.7A CN201510010051A CN104597154A CN 104597154 A CN104597154 A CN 104597154A CN 201510010051 A CN201510010051 A CN 201510010051A CN 104597154 A CN104597154 A CN 104597154A
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Abstract
The invention provides a device and a method for detecting VOC (volatile organic compound) in liquid. The detection device comprises a sample pool, an adsorption pipe and an analyzer; and the detection device is characterized by further comprising a standard gas supply module, a solvent supply module, a mixing pool, a quantifying module and a switch module, wherein the standard gas supply module is used for introducing quantitative standard gas into the mixing pool through a pipeline; the solvent supply module is used for introducing quantitative solvent into the mixing pool; the mixing pool is connected to the standard gas supply module and the solvent supply module; the quantifying module is used for quantifying the liquid; the input end of the switch module is connected to the mixing pool and used for being matched with the quantifying module to quantify the liquid, and the output end is connected to the sample pool and a pump. The device has advantages of accuracy, automation and the like.
Description
Technical field
The present invention relates to VOC to detect, particularly VOC pick-up unit and method in liquid.
Background technology
In the quantitative test of online purge and trap, usually can be divided into internal standard quanitation and outer marking quantitative method.Wherein internal standard quanitation can deduct due to the factor such as matrix interference, operate miss cause quantitatively inaccurate.Add interior calibration method at present in online purge and trap applied analysis and comprise mark and mark in automatic interpolation in manual interpolation.In wherein manually adding, target mode is easily because operate miss causes and causes quantitative result inaccurate.And automatically add interior target mode and can be divided into following three kinds, first: the mark liquid prepared is stored in container, is then added according to certain volume by precise injection pump or quantitative loop.Second: in automatic mixing, mark pure sample and neat solvent obtain required standard specimen concentration; 3rd: internally mark pure sample by inert gas and pressurize, make interior mark slowly volatilize and be transferred in adsorption tube.Due to the boiling point of VOCs, comparatively low volatility is good, and the interior mark concentration of first method gained easily changes with external environment in time, and after interior mark concentration reduces, quantitative result will produce positive error.In purge and trap application process add in target concentration lower, so mark compound method needs Multi-stage dilution in the second, more difficultly in online detection instrument realize automation mechanized operation and easily cause larger error, the pure sample of normal temperature lower part VOCs sample is solid-state cannot preparation according to the method in addition.The third adds interior calibration method owing to not being mark in adding liquid, so cannot deduct the error in pre-treatment, comprising impacts such as matrix interference, temperature, pH value, causes quantitatively inaccurate.
Summary of the invention
In order to solve the deficiency in above-mentioned prior art, the invention provides a kind of accurately, VOC pick-up unit in the liquid of robotization.
The object of the invention is to be achieved through the following technical solutions:
VOC pick-up unit in a kind of liquid, described pick-up unit comprises sample cell, adsorption tube, analyser; Described pick-up unit comprises further:
Gas provides module, and described gas provides module for passing into quantitative gas by pipeline in mixing pit;
Solvent provides module, and described solvent provides module for passing into quantitative solvent in described mixing pit;
Mixing pit, described mixing pit connects described gas provides module and solvent to provide module;
Quantitative module, described quantitative module is used for quantitative liquid;
Handover module, the input end of described handover module connects described mixing pit, and for coordinating with quantitative module with quantitative liquid, output terminal connects described sample cell, pump.
Present invention also offers accurately, VOC detection method in the liquid of robotization.This goal of the invention is achieved through the following technical solutions:
VOC detection method in liquid, described detection method comprises the following steps:
(A1) quantitative solvent is sent in mixing pit;
(A2) gas is passed in the solvent in described mixing pit by pipeline, is dissolved in described solvent, as mark liquid;
(A3) the mark liquid of quantitative certain volume, and feeding has in the sample cell of testing liquid;
(A4) volatile matter in described sample cell purges in adsorption tube by carrier gas, and desorb, send analyser afterwards;
(A5) analyser knows the VOC content in liquid by analysis.
Compared with prior art, the beneficial effect that the present invention has is:
1, liquid standard model is prepared in real time, can ensure the stability of concentration of interior standard specimen product, guarantee the accuracy of quantitative result;
2, full-automatic flow process, without the need to manual operation and maintenance, avoids the error that in artificial interpolation, index rises;
3, can according to Target Sample Concentrations and variation of ambient temperature, the cycle that in sets itself is required, mark concentration and interior mark upgrade.
Accompanying drawing explanation
With reference to accompanying drawing, disclosure of the present invention will be easier to understand.Those skilled in the art it is easily understood that: these accompanying drawings only for illustrating technical scheme of the present invention, and and are not intended to be construed as limiting protection scope of the present invention.In figure:
Fig. 1 is the structure diagram of VOC pick-up unit in the liquid according to the embodiment of the present invention;
Fig. 2 is the schematic diagram of VOC classification in the water according to the embodiment of the present invention.
Embodiment
Fig. 1-2 and following description describe Alternate embodiments of the present invention and how to implement to instruct those skilled in the art and to reproduce the present invention.In order to instruct technical solution of the present invention, simplifying or having eliminated some conventional aspects.Those skilled in the art should understand that the modification that is derived from these embodiments or replace will within the scope of the invention.Those skilled in the art should understand that following characteristics can combine to form multiple modification of the present invention in every way.Thus, the present invention is not limited to following Alternate embodiments, and only by claim and their equivalents.
Embodiment:
Fig. 2 schematically illustrates the structure diagram of VOC pick-up unit in the liquid of the embodiment of the present invention, and as shown in Figure 1, described pick-up unit comprises:
Sample cell, adsorption tube, GC-MS analyser; These parts are all the state of the art, do not repeat them here;
Gas provides module, and described gas provides module for passing into quantitative gas by pipeline in mixing pit; Described pipeline extend into the bottom in described mixing pit, in the solvent passed in mixing pit, is dissolved in better in solvent for making gas;
Solvent provides module, and described solvent provides module for passing into quantitative methyl alcohol in described mixing pit;
Mixing pit, described mixing pit connects described gas provides module and solvent to provide module;
Quantitative module, described quantitative module is used for quantitative liquid, as adopted quantitative loop;
Handover module, as adopted multi-channel direction selecting valve, the input end of described handover module connects described mixing pit, and for coordinating with quantitative module with quantitative liquid, output terminal connects described sample cell, pump.
VOC detection method in the liquid of the embodiment of the present invention, described detection method comprises the following steps:
(B1) open valve 9, valve 10 and syringe pump 3, by the washed with methanol whole piece pipeline in methyl alcohol reservoir vessel, waste liquid enters in waste liquid tank.Shutoff valve 9, drains the solution in mixing pit, 3 times repeatedly, the residual liquid thoroughly in displacement mixing pit;
(A1) shutoff valve 10 and syringe pump 3, open syringe pump 1; By setting-up time, by the methyl alcohol of 20mL input mixing pit;
(A2) valve 8 and air release is opened, according to application demand by the gas of certain volume input mixing pit;
Shutoff valve 8 and air release after ventilation, the air now in whole cavity is replaced by N2;
(A3) open valve 10 and syringe pump 3, the inner mark solution of preparation number is inputed in quantitative loop, quantifies mark liquid in 1mL;
(A4) open valve 6,7 and peristaltic pump, make aqueous sample stream in sample cell; After ready to balance, shutoff valve 7, shutoff valve 6 and peristaltic pump after target sample volume in sample cell reaches 1L;
Switch six-way valve and open valve 7 and syringe pump 2, by the inner mark solution input sample cell in quantitative loop, shutoff valve 7 and syringe pump 2;
Open valve 1 or valve 2 and valve 4,5, by carrier gas, the target substance in sample cell is delivered in adsorption tube;
Shutoff valve 3, valve 5, open valve 4, and adsorption tube is heated to 300 DEG C, and target substance send GC-MS;
(A4) GC-MS analyzes described target substance, thus knows the content of VOC in water, as shown in Figure 2, and 1-anti-1,2-dichloroethylene, 2-2 chloro-1,3 butadiene, 3-is along 1,2-dichloroethylene, 4-methenyl choloride, 5-1,2-ethylene dichloride, 6-benzene, 7-fluorobenzene (interior mark), 8-triclene, 9-toluene, 10-zellon, 11-chlorobenzene, 12-ethylbenzene, 13-m-xylene, 14-o-xylene, 15-1,3,5-trimethylbenzene, 16-is deuterated-Isosorbide-5-Nitrae-dichloro-benzenes (interior mark), 17-1,2-dichloro-benzenes, 18-1,2,4-trichloro-benzenes, 19-hexachlorobutadiene.
Claims (7)
1. a VOC pick-up unit in liquid, described pick-up unit comprises sample cell, adsorption tube, analyser; It is characterized in that: described pick-up unit comprises further:
Gas provides module, and described gas provides module for passing into quantitative gas by pipeline in mixing pit;
Solvent provides module, and described solvent provides module for passing into quantitative solvent in described mixing pit;
Mixing pit, described mixing pit connects described gas provides module and solvent to provide module;
Quantitative module, described quantitative module is used for quantitative liquid;
Handover module, the input end of described handover module connects described mixing pit, and for coordinating with quantitative module with quantitative liquid, output terminal connects described sample cell, pump.
2. pick-up unit according to claim 1, is characterized in that: described pipeline extend into the bottom in described mixing pit.
3. pick-up unit according to claim 1, is characterized in that: described solvent is methyl alcohol.
4. pick-up unit according to claim 1, is characterized in that: described handover module is multi-channel direction selecting valve.
5. VOC detection method in liquid, described detection method comprises the following steps:
(A1) quantitative solvent is sent in mixing pit;
(A2) gas is passed in the solvent in described mixing pit by pipeline, is dissolved in described solvent, as mark liquid;
(A3) the mark liquid of quantitative certain volume, and feeding has in the sample cell of testing liquid;
(A4) volatile matter in described sample cell purges in adsorption tube by carrier gas, and desorb, send analyser afterwards;
(A5) analyser knows the VOC content in liquid by analysis.
6. detection method according to claim 5, is characterized in that: described gas is fluorobenzene.
7. detection method according to claim 5, is characterized in that: described solvent is methyl alcohol.
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| CN201510010051.7A CN104597154B (en) | 2015-01-08 | 2015-01-08 | In liquid, VOC detects device and method |
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| CN201510010051.7A CN104597154B (en) | 2015-01-08 | 2015-01-08 | In liquid, VOC detects device and method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107389874A (en) * | 2017-08-24 | 2017-11-24 | 南京泰宇环境检测有限公司 | A kind of monitoring method for monitoring of environmental detection device accuracy |
| CN109406231A (en) * | 2018-12-18 | 2019-03-01 | 广州广电计量检测股份有限公司 | It is a kind of mist product in VOC measurement pretreating device and pre-treating method |
| CN110261510A (en) * | 2019-07-12 | 2019-09-20 | 上海舜宇恒平科学仪器有限公司 | A kind of on-line automatic sampling device detected for volatile organic matter in water |
| CN110346341A (en) * | 2019-08-08 | 2019-10-18 | 生态环境部华南环境科学研究所 | A kind of active o content automatic checkout system |
| CN111060632A (en) * | 2019-12-05 | 2020-04-24 | 四川明正检测技术有限公司 | Method for detecting tetraethyl lead in water |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107389874A (en) * | 2017-08-24 | 2017-11-24 | 南京泰宇环境检测有限公司 | A kind of monitoring method for monitoring of environmental detection device accuracy |
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| CN110261510A (en) * | 2019-07-12 | 2019-09-20 | 上海舜宇恒平科学仪器有限公司 | A kind of on-line automatic sampling device detected for volatile organic matter in water |
| CN110346341A (en) * | 2019-08-08 | 2019-10-18 | 生态环境部华南环境科学研究所 | A kind of active o content automatic checkout system |
| CN111060632A (en) * | 2019-12-05 | 2020-04-24 | 四川明正检测技术有限公司 | Method for detecting tetraethyl lead in water |
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Effective date of registration: 20160729 Address after: Hangzhou City, Zhejiang province Binjiang District 310052 shore road 760 Applicant after: Focused Photonics (Hangzhou) Inc. Applicant after: Hangzhou Pu Yu development in science and technology Co., Ltd Address before: Hangzhou City, Zhejiang province Binjiang District 310052 shore road 760 Applicant before: Focused Photonics (Hangzhou) Inc. |
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Effective date of registration: 20170905 Address after: Hangzhou City, Zhejiang province Binjiang District 310052 shore road 760 Building 1 floor B block 6 Patentee after: Zhejiang spotlight Detection Technology Service Co., Ltd. Address before: Hangzhou City, Zhejiang province Binjiang District 310052 shore road 760 Co-patentee before: Hangzhou Pu Yu development in science and technology Co., Ltd Patentee before: Focused Photonics (Hangzhou) Inc. |
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Address after: Hangzhou City, Zhejiang province Binjiang District 310052 shore road 760 Patentee after: Hangzhou Puyu Testing Co., Ltd Address before: Hangzhou City, Zhejiang province Binjiang District 310052 shore road 760 Building 1 floor B block 6 Patentee before: Zhejiang spotlight Detection Technology Service Co.,Ltd. |
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