CN102735859A - Automatic online monitoring method and device for VOCs (volatile organic chemicals) in water - Google Patents
Automatic online monitoring method and device for VOCs (volatile organic chemicals) in water Download PDFInfo
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- CN102735859A CN102735859A CN2012102436463A CN201210243646A CN102735859A CN 102735859 A CN102735859 A CN 102735859A CN 2012102436463 A CN2012102436463 A CN 2012102436463A CN 201210243646 A CN201210243646 A CN 201210243646A CN 102735859 A CN102735859 A CN 102735859A
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Abstract
The invention discloses an automatic online monitoring method and device for VOCs (volatile organic chemicals) in water, which can be used for automatically and quickly monitoring the contents and concentration of VOCs in water, and transmitting the real-time data to a remote center platform and realizing remote reverse control. The device comprises an automatic water taking device, an automatic sampling device, a purging and gathering concentrator, a gas chromatograph, a tandem type detector, an industrial controller and a data transmission module. The method and the device disclosed by the invention are fit for automatically on-line monitoring 60 volatile organic chemicals published by the method 502.2 of US EPA (Environmental Protection Agency), particularly for 29 volatile organic chemicals stipulated in Sanitary Standard for Drinking water. The method and the device have the advantages of quick speed, high monitoring sensitivity, stable and reliable performance, full-automatic monitoring and data transmission and on the like, can be applied for automatic monitoring stations, mobile emergency monitoring stations and labs.
Description
Technical field
The present invention relates to the water quality monitoring technical field, VOCs automatic on-line monitoring method and device in particularly a kind of water.
Background technology
At present; It mainly is through chromatographic technique that the composition of VOCs in the water (volatile organic matter) and concentration thereof detect; Because its sensitivity is limited; Needs in analyzing and testing carry out concentrating and separating to water sample to be measured earlier, and main concentrating and separating technology has now: the separation of liquid direct injected, liquid-liquid extraction, SPE, semipermeable partition abstraction technique and headspace sampling technology etc.
These above-mentioned concentrating and separating technology exist following weak point: 1) the concentration extraction process can cause the loss of volatile organic matter, causes measurement result less than normal; 2) (such as liquid-liquid extraction) can be introduced poisonous organic solvent in the concentration process, causes secondary pollution; 3) concentration of the volatile organic matter in present potable water and the environmental water sample is in ng/L-μ g/L rank; The volume that capillary chromatographic column in the chromatogram injects is the microlitre magnitude; Cause direct analyzing and testing sensitivity not reach requirement, need the concentrated of larger volume specimen could guarantee detection sensitivity usually; 4) chromatography instrument installation and service condition are had relatively high expectations; Have characteristics such as length consuming time and selectivity are strong; Be difficult to realize robotization, difficulty reaches sudden water environment pollution incident emergency monitoring demand, and the quick monitoring method that burst is polluted to the water source is still immature at present.
A kind of detection method that adopts purge and trap to analyze VOCs is arranged at present, and can directly measure concentration is the volatile organic matter concentration of ppb magnitude, can auto injection, and do not need solvent extraction and separation, thereby simplify analytic process, accelerate analysis speed, improve sensitivity.
But in conventional detection, automaticity is low; Operations all is to be main with manual work, comprises the hand sampling in early stage, the instrument control in the mid-term processing procedure; And the data analysis in later stage; Whole process is consuming time longer, and needs professional stratographic analysis personnel operation, inevitably also can bring artificial error; Simultaneously, the pre-treating method disunity, instrument and equipment is complicated, and the plant maintenance difficulty is very big; On the other hand, all be to be main with the unit detection, realize that networking intercommunication and data in real time transmit.
Therefore, how to improve monitoring method and the device of VOCs in the water, realize full-automatic unmanned monitoring on duty and data analysis, reduce artificial error ratio, improve monitoring efficient, become the important technological problems that those skilled in the art need to be resolved hurrily.
Summary of the invention
In view of this, first purpose of the present invention provides VOCs automatic on-line monitoring method in a kind of water, realizes full-automatic unmanned monitoring on duty and data analysis, reduces artificial error ratio, improves monitoring efficient.
Second purpose of the present invention provides VOCs automatic on-line monitoring device in a kind of water that adopts said method.
For realizing above-mentioned purpose, the present invention provides following technical scheme:
VOCs automatic on-line monitoring method in a kind of water comprises step:
1) after Industrial Control Computer received the monitoring instruction, the control automatic sampling apparatus collected quantitative water sample from water source to be measured;
2) said Industrial Control Computer is controlled automatic pretreating device said water sample is carried out pre-treatment receiving under the situation that gather to accomplish signal, obtains directly being used for the analytic sample of gas chromatographic detection;
3) said Industrial Control Computer is under the situation that receives pre-treatment completion signal, and control gas chromatographic detection device carries out gas chromatographic detection to said analytic sample, obtains detecting collection of illustrative plates;
4) said Industrial Control Computer should detect collection of illustrative plates receiving under the situation that detects collection of illustrative plates completion signal through the monitoring analysis software processes, obtained the qualitative, quantitative data.
Preferably, from water source to be measured, collect quantitative water sample in the said step 1) and specifically comprise two steps, be followed successively by that step 11) is obtained quantitative water sample from water source to be measured and step 12) is exported said water sample.
Preferably, said step 2) pre-treatment in specifically comprises two steps, is followed successively by step 21) said water sample is carried out purge and trap concentrate adsorption analysis sample and step 22) thermal desorption and export said analytic sample.
Preferably, the gas chromatographic detection in the said step 3) specifically comprises two steps, is followed successively by step 31) said analytic sample is detected and step 32 through the photoion detecting device) said analytic sample is detected through electrolytic conductivity detector.
Preferably, after said step 4), also comprise the said Industrial Control Computer of step 5) with said qualitative, quantitative data upload to the upper end remote center's platform; In above-mentioned whole observation process; The situation of carrying out of said each step of Industry Control machine monitoring; And these situation are uploaded to remote center's platform, and said remote center platform can be realized the telecommunication control function through the monitoring field control software of installing on the said Industrial Control Computer.
VOCs automatic on-line monitoring device in a kind of water; Comprise the gas chromatographic detection device that adopts gas chromatograph; Also comprise automatic sampling apparatus, automatic pretreating device and Industrial Control Computer; Said Industrial Control Computer has the control module that is respectively applied for control said automatic sampling apparatus, said automatic pretreating device and said gas chromatographic detection device, and said Industrial Control Computer has the data analysis module that is used for the processing and detecting collection of illustrative plates.
Preferably; Said automatic sampling apparatus comprises automatically taking water device and automatic sampling apparatus; Said automatically taking water device comprises main intake pipe and subsequent use water pipe; Realize automaticallying switch said PLC controller pilot relay, thereby the water intaking of said relay control A.C. contactor control water pump through the corresponding solenoid valve of PLC controller control; And said automatically taking water device is monitored water withdrawal through the liquid level sensor that is installed in the tank, and the may command three-way solenoid valve is realized remained water discharge and pond cleaning.
Preferably, pretreating device is specially the purge and trap concentrating instrument automatically, comprising:
Be connected in the purge and trap pipe of said automatic sampling device, an end of said purge and trap pipe is connected in the carrier gas feedway;
Be used for adsorbing the collecting trap of the analytic sample that water sample purged out;
Be used to regulate the collecting trap temperature-controlled box of the temperature of said collecting trap;
Control switched conductive through the electronics six-way valve between the vaporizer of said purge and trap pipe, said collecting trap, said gas chromatograph and the said carrier gas feedway.
Preferably, said gas chromatographic detection device specifically comprises:
Gas chromatograph;
Tandem photoion detecting device and electrolytic conductivity detector;
The carrier gas feedway and the hydrogen gas supplying apparatus of carrier gas are provided.
Preferably, comprise also that said remote center platform can be realized the telecommunication control function through the monitoring field control software of installing on the said Industrial Control Computer through remote center's platform of data transmission module with said Industrial Control Computer data communication.
Can find out that from above-mentioned technical scheme VOCs automatic on-line monitoring method in the water provided by the invention is controlled automatic sampling apparatus, automatic pretreating device and pick-up unit through Industrial Control Computer; And can should detect collection of illustrative plates through the monitoring analysis software processes, obtain the qualitative, quantitative data, thereby realized full-automatic unmanned monitoring on duty and data analysis; Composition and the concentration thereof of VOCs in can the fast detecting water outlet, detection sensitivity is high, and is stable and reliable for performance; Compare with manually-operated of the prior art, this method is more easy, has reduced artificial error ratio; Improve monitoring efficient, be fit to Complex Water Environment monitorings such as sudden water pollution.
The present invention also provides VOCs automatic on-line monitoring device in a kind of water of using said method; Full-automatic unmanned monitoring on duty and data analysis have been realized; The instrument and equipment modularization is integrated; Have working service convenient, be easy to upgrade and advantage that function is switched, be suitable for analysis of components, measurement of concetration, Monitoring Data transmission and the instrument Long-distance Control of volatile organic matter in the water of aspects such as automatic monitor station, mobile emergency monitoring station, laboratory.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The schematic flow sheet of VOCs automatic on-line monitoring method in the water that Fig. 1 provides for the embodiment of the invention;
The structural representation of the automatically taking water device that Fig. 2 provides for the embodiment of the invention;
The synoptic diagram of the purge and trap concentrating instrument purge stages that Fig. 3 provides for the embodiment of the invention;
The synoptic diagram in the purge and trap concentrating instrument desorption stage that Fig. 4 provides for the embodiment of the invention;
The structural representation of the gas chromatographic detection device that Fig. 5 provides for the embodiment of the invention.
Wherein, 1 is the automatically taking water device, and 2 is automatic sampling apparatus; 3 is the purge and trap concentrating instrument, and 4 is gas chromatograph, and 5 is the photoion detecting device; 6 is electrolytic conductivity detector, and 7 is Industrial Control Computer, and 8 is data transmission module; 9 are the carrier gas feedway, and 10 is hydrogen gas supplying apparatus, and 11 is the PLC controller;
101 are the water intaking water pipe, and 102 is subsequent use water pipe, and 103 is first solenoid valve, and 104 second is solenoid valve, and 105 is water pump, and 106 is three-way solenoid valve, and 107 is tank, and 108 is liquid level sensor, and 109 is A.C. contactor, and 110 is relay;
301 is the purge and trap pipe, and 302 is the electronics six-way valve, and 303 is collecting trap, and 304 is the collecting trap temperature-controlled box, and 9-3 is for inserting the carrier gas of purge and trap concentrating instrument, and 9-4 is for inserting the carrier gas of gas chromatograph.
Embodiment
The invention discloses VOCs automatic on-line monitoring method and device in a kind of water, realize full-automatic unmanned monitoring on duty and data analysis, reduce artificial error ratio, improve monitoring efficient.
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
See also Fig. 1, the schematic flow sheet of VOCs monitoring method in the water that Fig. 1 provides for the embodiment of the invention.
VOCs automatic on-line monitoring method in the water that the embodiment of the invention provides, its core inventive point is, comprises step:
After step S1, Industrial Control Computer received the monitoring instruction, the control automatic sampling apparatus collected quantitative water sample from water source to be measured (comprising river, river, well, sewage draining exit etc.);
This monitoring instruction can be by sending manually; Also can be that system itself sends automatically; Such as passing through pre-set programs; At the appointed time or at set intervals just once monitor, thereby improved the automaticity of installing, be specially adapted to the use in places such as some automatic monitor stations or laboratory.
Step S2, Industrial Control Computer gather under the situation of accomplishing signal receiving, and control automatic pretreating device water sample is carried out pre-treatment, obtain directly being used for the analytic sample of gas chromatographic detection;
After treating that water sampling is accomplished, Industrial Control Computer is controlled the entering next-step operation automatically, and the analytic sample in the water sample is extracted.
Step S3, Industrial Control Computer are under the situation that receives pre-treatment completion signal, and control gas chromatographic detection device carries out gas chromatographic detection to analytic sample, obtains detecting collection of illustrative plates;
Under the control of Industrial Control Computer, pick-up unit carries out chromatographic resolution to analytic sample automatically and detects, and exports the detection collection of illustrative plates that obtains.
Step S4, Industrial Control Computer should detect collection of illustrative plates receiving under the situation that detects collection of illustrative plates completion signal through the monitoring analysis software processes, obtained the qualitative, quantitative data;
Through contrast, thereby obtain monitoring result, comprise whether water sample is qualified with each item standard index, if defective, the composition and the concentration of the material that wherein exceeds standard.
Can find out that from above-mentioned technical scheme VOCs automatic on-line monitoring method in the water that the embodiment of the invention provides is controlled automatic sampling apparatus, automatic pretreating device and pick-up unit through Industrial Control Computer; And can should detect collection of illustrative plates through the monitoring analysis software processes, obtain the qualitative, quantitative data, thereby realized full-automatic unmanned monitoring on duty and data analysis; Composition and the concentration thereof of VOCs in can the fast detecting water outlet, detection sensitivity is high, and is stable and reliable for performance; Compare with manually-operated of the prior art, this method is more easy, has reduced artificial error ratio; Improve monitoring efficient, be fit to Complex Water Environment monitorings such as sudden water pollution.
VOCs automatic on-line monitoring method in the water that the embodiment of the invention provides; From water source to be measured, collect quantitative water sample in the step 1) and specifically comprise two steps; Be followed successively by step 11) and from water source to be measured, obtain quantitative water sample and step 12) output water sample.Certainly, these two steps also can realize in same step.
At present; The composition of VOCs and concentration monitor thereof mainly are through chromatographic technique in the water; Because its sensitivity is limited; The elder generation that needs analyzing monitoring carries out concentrating and separating to water sample to be measured, i.e. pre-treatment, and main pretreatment technology has now: the separation of liquid direct injected, liquid-liquid extraction, SPE, semipermeable partition abstraction technique and headspace sampling technology etc.In a preferred embodiment, the mode of purge and trap is used in pre-treatment.Step 2 then) pre-treatment in specifically comprises two steps, is followed successively by step 21) water sample is carried out purge and trap concentrate adsorption analysis sample and step 22) thermal desorption and export analytic sample.So, can directly measure concentration is the volatile organic matter concentration of ppb magnitude, can auto injection, and do not need solvent extraction and separation, thereby simplify analytic process, accelerate analysis speed, improve sensitivity.
In order further to optimize above-mentioned technical scheme; Gas chromatographic detection in the step 3) specifically comprises two steps, is followed successively by step 31) said analytic sample is passed through photoion detecting device detection and 32) said analytic sample is detected through electrolytic conductivity detector; The series connection of these two kinds of detecting devices is used; Enlarged the parameter area of monitoring,, thereby improved monitoring accuracy through twice detection monitoring of comparing.
VOCs automatic on-line monitoring method in the water that the embodiment of the invention provides, after step 4), also comprise the step 5) Industrial Control Computer with the qualitative, quantitative data upload to the upper end remote center's platform; In above-mentioned whole observation process; The situation of carrying out of each step of Industry Control machine monitoring; And these situation are uploaded to remote center's platform, and remote center's platform can be realized the telecommunication control function through the monitoring field control software of installing on the Industrial Control Computer.
In sum; The embodiment of the invention provides VOCs automatic on-line monitoring method in a kind of water; From: the whole process automation control of water sample sampling-water sample sample introduction-purge step-concentration step-desorption-aggregation of data analysis-data transmission; And final Monitoring Data can upload to remote center's platform automatically; Remote center's platform can be controlled all through monitoring field control software and relate to instrument and whole flow process, oppositely controls with issue an order etc. to the monitoring instrument at scene, comprises long-rangely can issuing functions such as urgent monitoring order, standard specimen verification, mark-on recovery.
In above-mentioned water on the basis of VOCs automatic on-line monitoring method; The embodiment of the invention also provides VOCs automatic on-line monitoring device in a kind of water of using this method; Comprise the gas chromatographic detection device that adopts gas chromatograph 4; Its core inventive point is; Also comprise automatic sampling apparatus, automatic pretreating device and Industrial Control Computer 7, Industrial Control Computer 7 has the control module that is respectively applied for control automatic sampling apparatus, automatic pretreating device and gas phase chromatographic detection apparatus, and Industrial Control Computer 7 has the data analysis module that is used for the processing and detecting collection of illustrative plates.
VOCs automatic on-line monitoring device in the water that the embodiment of the invention provides; Full-automatic unmanned monitoring on duty and data analysis have been realized; The instrument and equipment modularization is integrated; Have working service convenient, be easy to upgrade and advantage that function is switched, be suitable for analysis of components, measurement of concetration, Monitoring Data transmission and the instrument Long-distance Control of volatile organic matter in the water of aspects such as automatic monitor station, mobile emergency monitoring station, laboratory.
VOCs automatic on-line monitoring device in the water that the embodiment of the invention provides; Its automatic sampling apparatus comprises automatically taking water device 1 and automatic sampling apparatus 2; Further improved automaticity, automatically taking water device 1 comprises main intake pipe 101 and subsequent use water pipe 102, realizes automaticallying switch through the corresponding solenoid valve of PLC controller 11 controls; PLC controller 11 pilot relays 110; Thereby the 109 control water pumps water intakings of relay 110 control A.C. contactors, and automatically taking water device 1 is through being installed in the liquid level sensor 108 monitoring water withdrawals in the tank 107, and may command three-way solenoid valve 106 is realized remained water discharges and pond cleaning.Certainly, automatically taking water device 1 also can merge with automatic sampling apparatus 2 and form a kind of instrument or device.
As shown in Figure 2, the structural representation of the automatically taking water module that Fig. 2 provides for the embodiment of the invention; Wherein, 101 are the water intaking water pipe, and 102 is subsequent use water pipe, and 103 is first solenoid valve, and 104 second is solenoid valve, and 105 is water pump, and 106 is three-way solenoid valve, and 107 is tank, and 108 is liquid level sensor, and 109 is A.C. contactor, and 110 is relay.Automatically taking water device 1 mainly is made up of above-mentioned 10 parts, has adopted 101 and 102 two water intaking pipelines (is equipped with a usefulness), and realizes automaticallying switch through PLC controller 11 control electromagnetic valve 103 and 104.Wherein, the water pump 105 in the automatically taking water device 1 can adopt the water pump of multiple model according to actual operating position.
As preferably, pretreating device is specially purge and trap concentrating instrument 3 automatically, comprising:
Be connected in the purge and trap pipe 301 of automatic sampling device, an end of purge and trap pipe 301 is connected in carrier gas feedway 9;
Be used for adsorbing the collecting trap 303 of the analytic sample that water sample purged out;
Be used to regulate the collecting trap temperature-controlled box 304 of the temperature of collecting trap 303;
Control switched conductive through electronics six-way valve 302 between the vaporizer of purge and trap pipe 301, collecting trap 303, gas chromatograph 4 and the carrier gas feedway 9.
Fig. 3 and Fig. 4 are respectively the VOCs inspection automatic on-line monitoring device purge stages and the synoptic diagram in desorption stage in the water that the embodiment of the invention provides.In purge stages; Automatic sampling apparatus 2 quantitatively is input to water sample to be measured in the purge and trap pipe 301; Industrial Control Computer 7 provides instruction unpack carrier gas (normally helium) valve 9-3, begins water sample to be measured is purged, and the analytic sample in the water sample is through purging the back enrichment in the adsorbent of collecting trap 303.Get into the desorption stage then, electronics six-way valve 302 rotates, and collecting trap temperature-controlled box 304 is rapidly heated, and the carrier gas 9-4 that is controlled by gas chromatograph behind the analytic sample desorption is transferred to gas chromatograph 4 to be separated.
VOCs inspection automatic on-line monitoring device in the water that the embodiment of the invention provides, its gas chromatographic detection device specifically comprises:
Tandem photoion detecting device 5 and electrolytic conductivity detector 6;
The carrier gas feedway 9 and the hydrogen gas supplying apparatus 10 of carrier gas are provided, and in the present embodiment, the inert gas that carrier gas feedway 9 uses is specially helium.
From the analytic sample that the chromatographic column of gas chromatograph is separated, be introduced in the PID detecting device, monitor those undersaturated aromatic substances here; From the material that the PID detecting device flows out, get into the ELCD detecting device at once with the monitoring halogen species, through such cascaded structure, two detecting devices have the common factor of monitoring parameter, can monitor aromatic series and halogen species simultaneously, and perfect VOCs monitoring means is provided; Simultaneously, no longer need carry out twice and independently analyze, no longer need transfer line, only take the detecting device port of a gas chromatography, only use a pillar.
Certainly, the gas chromatograph detecting device can also adopt PID/ECD except that PID/ELCD combination disclosed by the invention; MS, PID, ECD; Detecting device and combinations thereof such as ELCD will be conspicuous concerning those skilled in the art to the multiple modification of these embodiment, repeat no more at this.
VOCs automatic on-line monitoring device in the water that the embodiment of the invention provides; Comprise also that through the remote center platform of data transmission module 8 remote center's platform can be realized the telecommunication control function through the monitoring field control software of installing on the Industrial Control Computer with Industrial Control Computer 7 data communications.
See also Fig. 5, the structural representation of VOCs automatic on-line monitoring device in the water that Fig. 5 provides for the embodiment of the invention.Wherein, dotted line is represented the gas transmission route, band arrow solid line statement sample transmission route, and band double-head arrow solid line is represented Communication Control.
To combine Fig. 5 below, sending the monitoring instruction automatically with system is example, and overall technical architecture of the present invention is introduced:
Industrial Control Computer (monitoring analysis software) 7 provides the monitoring instruction; PLC controller 11 receives instruction and starts automatically taking water device 1 gathers water sample; After water sample to be collected is accomplished; Automatic sampling apparatus 2 receives that 11 instructions of PLC controller begin to take a sample automatically and send into purge and trap; The program that purge and trap concentrating instrument 3 is set according to Industrial Control Computer 7 captures organism in the water sample to collecting trap 303; Collecting trap 303 is by heating fast, and thermal desorption analytic sample and the carrier gas transimiison analysis sample that utilizes gas chromatography be to gas chromatograph 4, and analytic sample separates through the gas chromatograph chromatographic column and successively gets into photoion detecting device (PID) 5 and electrolytic conductivity detector (ELCD) 6 detections; Detect spectrogram and be transferred to Industrial Control Computer 7, obtain the qualitative, quantitative data and upload to the upper end platform after Industrial Control Computer monitoring analysis software is handled collection of illustrative plates through data transmission module 8.
Monitoring method condition: embodiment 1
In sum, the invention discloses a kind of water VOCs automatic on-line monitoring method and device of being used for, can be used for composition and the concentration thereof of VOCs in the automatic fast monitored water, and real-time Data Transmission is to center and the long-range countercharge of realization.Mainly by the automatically taking water device, automatic sampling apparatus, the purge and trap concentrating instrument, gas chromatograph, tandem detecting device (PID and ELCD), integrated morphologies such as Industrial Control Computer and data transmission module are formed, and have characteristics such as working service convenience, stable performance.
Method and apparatus disclosed by the invention is applicable to the automatic on-line monitoring of 60 kinds of volatile organic matters that U.S. EPA method 502.2 is announced, is particularly useful for the automatic on-line monitoring of 29 kinds of volatile organic matters of " drinking water sanitary standard " regulation.Advantages such as this method and apparatus has that speed is fast, monitoring sensitivity is high, stable and reliable for performance, auto monitoring and measurement and data transmission are suitable for analysis of components, measurement of concetration, Monitoring Data transmission and the instrument Long-distance Control of volatile organic matter in the water of aspects such as automatic monitor station, mobile emergency monitoring station, laboratory.
Each embodiment adopts the mode of going forward one by one to describe in this instructions, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (10)
1. VOCs automatic on-line monitoring method in the water is characterized in that, comprises step:
1) after Industrial Control Computer received the monitoring instruction, the control automatic sampling apparatus collected quantitative water sample from water source to be measured;
2) said Industrial Control Computer is controlled automatic pretreating device said water sample is carried out pre-treatment receiving under the situation that gather to accomplish signal, obtains directly being used for the analytic sample of gas chromatographic detection;
3) said Industrial Control Computer is under the situation that receives pre-treatment completion signal, and control gas chromatographic detection device carries out gas chromatographic detection to said analytic sample, obtains detecting collection of illustrative plates;
4) said Industrial Control Computer should detect collection of illustrative plates receiving under the situation that detects collection of illustrative plates completion signal through the monitoring analysis software processes, obtained the qualitative, quantitative data.
2. VOCs automatic on-line monitoring method in the water according to claim 1; It is characterized in that; From water source to be measured, collect quantitative water sample in the said step 1) and specifically comprise two steps; Be followed successively by that step 11) is obtained quantitative water sample from water source to be measured and step 12) is exported said water sample.
3. VOCs automatic on-line monitoring method in the water according to claim 2; It is characterized in that; Said step 2) pre-treatment in specifically comprises two steps; Be followed successively by step 21) said water sample is carried out purge and trap concentrate adsorption analysis sample and step 22) thermal desorption and export said analytic sample.
4. VOCs automatic on-line monitoring method in the water according to claim 3; It is characterized in that; Gas chromatographic detection in the said step 3) specifically comprises two steps; Be followed successively by step 31) said analytic sample is detected and step 32 through the photoion detecting device) said analytic sample is detected through electrolytic conductivity detector.
5. according to VOCs automatic on-line monitoring method in any described water of claim 1-4, it is characterized in that, after said step 4), also comprise the said Industrial Control Computer of step 5) with said qualitative, quantitative data upload to the upper end remote center's platform; In above-mentioned whole observation process; The situation of carrying out of said each step of Industry Control machine monitoring; And these situation are uploaded to remote center's platform, and said remote center platform can be realized the telecommunication control function through the monitoring field control software of installing on the said Industrial Control Computer.
6. VOCs automatic on-line monitoring device in the water; Comprise the gas chromatographic detection device that adopts gas chromatograph (4); It is characterized in that; Also comprise automatic sampling apparatus, automatic pretreating device and Industrial Control Computer (7), said Industrial Control Computer (7) has the control module that is respectively applied for control said automatic sampling apparatus, said automatic pretreating device and said gas chromatographic detection device, and said Industrial Control Computer (7) has the data analysis module that is used for the processing and detecting collection of illustrative plates.
7. VOCs automatic on-line monitoring device in the water according to claim 6; It is characterized in that; Said automatic sampling apparatus comprises automatically taking water device (1) and automatic sampling apparatus (2); Said automatically taking water device (1) comprises main intake pipe (101) and subsequent use water pipe (102); Realize automaticallying switch through the corresponding solenoid valve of PLC controller (11) control, said PLC controller (11) pilot relay (110), said relay (110) are controlled A.C. contactor (109) thereby the water intaking of control water pump; And said automatically taking water device (1) is monitored water withdrawal through the liquid level sensor (108) that is installed in the tank (107), and may command three-way solenoid valve (106) is realized remained water discharge and pond cleaning.
8. VOCs automatic on-line monitoring device in the water according to claim 7 is characterized in that, pretreating device is specially purge and trap concentrating instrument (3) automatically, comprising:
Be connected in the purge and trap pipe (301) of said automatic sampling device, an end of said purge and trap pipe (301) is connected in carrier gas feedway (9);
Be used for adsorbing the collecting trap (303) of the analytic sample that water sample purged out;
Be used to regulate the collecting trap temperature-controlled box (304) of the temperature of said collecting trap (303);
Control switched conductive through electronics six-way valve (302) between the vaporizer of said purge and trap pipe (301), said collecting trap (303), said gas chromatograph (4) and the said carrier gas feedway (9).
9. VOCs automatic on-line monitoring device in the water according to claim 8 is characterized in that, said gas chromatographic detection device specifically comprises:
Gas chromatograph (4);
Tandem photoion detecting device (5) and electrolytic conductivity detector (6);
The carrier gas feedway (9) and the hydrogen gas supplying apparatus (10) of carrier gas are provided.
10. according to VOCs automatic on-line monitoring device in any described water of claim 6-9; It is characterized in that; Comprise also that through the remote center platform of data transmission module (8) said remote center platform can be realized the telecommunication control function through the monitoring field control software of installing on the said Industrial Control Computer with said Industrial Control Computer (7) data communication.
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| CN103713071A (en) * | 2013-12-30 | 2014-04-09 | 力合科技（湖南）股份有限公司 | Online pretreatment device for VOCs (volatile organic compounds) in water |
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| CN109507320A (en) * | 2018-11-21 | 2019-03-22 | 苏州仓江行电子科技有限公司 | A kind of volatile organic matter on-line monitoring system and method |
| CN109781969A (en) * | 2019-01-18 | 2019-05-21 | 清华大学深圳研究生院 | A kind of expiratory air sample pretreatment device and processing method |
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| CN110632200A (en) * | 2019-09-27 | 2019-12-31 | 四川师范大学 | Bubble extraction device based on greenhouse gas and method for realizing efficient analysis of volatile components of sample by using bubble extraction device |
| CN110632200B (en) * | 2019-09-27 | 2022-03-01 | 四川师范大学 | Bubble extraction device based on greenhouse gas and method for realizing efficient analysis of volatile components of sample by using bubble extraction device |
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Inventor after: Wen Liqun Inventor after: Wang Wulin Inventor after: Li Jun Inventor after: Zou Xiongwei Inventor after: Tong Shehua Inventor after: Shen Tiantian Inventor before: Wang Wulin Inventor before: Wen Liqun Inventor before: Li Jun Inventor before: Zou Xiongwei Inventor before: Tong Shehua Inventor before: Shen Tiantian |