CN102721579A - Device for sampling and detecting volatile organic matter in water - Google Patents
Device for sampling and detecting volatile organic matter in water Download PDFInfo
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- CN102721579A CN102721579A CN2012102232470A CN201210223247A CN102721579A CN 102721579 A CN102721579 A CN 102721579A CN 2012102232470 A CN2012102232470 A CN 2012102232470A CN 201210223247 A CN201210223247 A CN 201210223247A CN 102721579 A CN102721579 A CN 102721579A
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Abstract
The invention relates to the field of detection instruments, in particular to a device for sampling and detecting content of a volatile organic matter in water. The device for sampling and detecting the content of the volatile organic matter in the water comprises a hollow sampler and a gas detector connected with the sampler, wherein more than one water inlet channel is formed on the side wall of the lower half part of the sampler; and a gas bubbler is arranged at the lower end of the sampler. By the detecting device, on-site detection is performed conveniently, and the accuracy and continuity of measurement are ensured.
Description
Technical field
The present invention relates to a kind of detecting instrument field, particularly relate to a kind of sample detecting device that detects volatile organic content in the water.
Background technology
Multiple volatile organic matter can get into through various approach such as discharging, leakage, diffusion in environment water such as surface water, underground water, seawater and the various productive life water; According to the difference of its character, can cause adverse effect or potential threat to environment, ecology, safety, health etc.Various organism such as aromatic hydrocarbon, aliphatic hydrocarbon and halogenated hydrocarbons etc. are difficult for decomposing, in the water layer that can permeate the ground because its chemical property is more stable; Very big to environmental disruption; If long-term contact can cause the human body slow poisoning, cause cancer also can directly have influence on reproduction and nervous system.Therefore, the monitoring to volatile organic contaminant in the water becomes more and more important in environmental analysis work.The reason that causes water to pollute comprises that industrial waste water, domestic rubbish disposal are improper, the incident of leakage of petrochemical plant incident of leakage and marine vessel etc.To some incidents of leakage, we must take emergency measures, and cut off the propagation of polluting as early as possible, confirm fast that therefore the pollution condition of water body is very important.Traditional the mode that detects in the laboratory is taken back in the polluted source sampling obviously can not be tackled various accidents, and some portability apparatus measures instruments often exist poor accuracy, apparatus expensive, the inconvenience of measurement result problem such as to carry.
The difficulty of the detection of volatile organic compounds in the water body (VOC) is spot sampling and express-analysis.Traditional sampling mode is generally to be delivered to the laboratory after the container sampling and extracts methods such as (like U.S. Pat 2011/094105A1), enrichment (like U.S. Pat 2001/0003426A1) or purge and trap.Obviously, these methods all can not satisfy the requirement of on-the-spot test, and the time that stops between sampling and the test is also longer, and variation to a certain degree inevitably takes place the water body composition.In addition, processes such as follow-up extraction, enrichment and purge and trap are complicated, length consuming time, and can not complete reaction actual water sample ingredient.The escaping gas that the head space method is collected in the water body obviously is superior to the above-mentioned method of sampling, and U.S. Pat 5773713 uses a kind of polymer film to put into detected water sample, and the VOC in the water permeates or diffuses through polymer film, and is to be detected thereby diluted air-flow is taken out of.U.S. Pat 5448922 discloses a kind of gas osmosis system, and it has also used gas-permeable membrane.The shortcoming of using film to separate this method is that the flow of gas depends on the characteristic of film to a great extent, receives the material of film, length, and the sectional area influence is very big, receives the pressure influence of system also bigger.Therefore reliability is not high, and the structure very complicated.It is thus clear that up to the present, Shang Weiyou can efficient, quick, portable, the reliable on-the-spot device that detects volatile organic contaminant in the water body.
Summary of the invention
The shortcoming of prior art the object of the present invention is to provide a kind of efficient, quick, portable, reliable a kind of pick-up unit that detects volatile organic content in the water in view of the above.
First aspect present invention provides a kind of sampling and pick-up unit that is used for detecting the water volatile organic content; Comprise the sampling thief of a hollow and the detector that links to each other with sampling thief; The sidewall of said sampling thief the latter half is provided with more than one intake tunnel, and the lower end is provided with the gas bubbler.
The effect of said gas bubbler is to make the purge gas that gets into cavity be divided into one or more micro-bubbles, and bubbler can be one or one group of aperture or porosint.
Said intake tunnel is enough little, makes bubble not overflow from it, and what these intake tunnels also can change the effect that can reach identical into has a certain width (web plate of 0.1 ~ 5mm) slit or certain pore structure.The hole area of said intake tunnel should reach 3mm
2More than, so that the water body in the sampling thief can be in time and the outer water body exchange to be measured of sampling thief, accurate with the assurance measurement result.
Preferably; Also comprise gas access pipeline, the gentle body sweep gas of gas vent pipeline air intake pump; Said gas access pipeline one end is communicated with said sampling thief bottom; The other end is connected with said gas purging gas air intake pump, and said gas vent pipeline one end is communicated with said sampling thief top, and the other end links to each other with said detector.
Preferably, said gas vent pipeline is provided with the gaseous sample collecting pump.
Preferably, also be provided with the purified purge gas device on the pipeline of said gas access.Said purified purge gas device is used for removing the impurity of purge gas for filling the filtrator of adsorbent.When confirm purge gas this during as the clean air that do not influence detection the purified purge gas device can omit.The material that gas outlet tube route Teflon etc. does not adsorb organic volatile promoting the circulation of qi body is processed; Make gaseous sample reduce detectable concentration or postpone detection time causing, the volatile organic matter desorption of absorption in the time of also can not detecting and influence the result who detects next time because of last time through not adsorbing in the process of pipeline.
Preferably, also be provided with the gaseous sample dehumidifier on the said gas vent pipeline.Said gaseous sample dehumidifier is made up of a sleeve pipe or interlayer pipeline; Outer tube or the outer encapsulant that can not be passed through by gas are formed, and interior pipe or internal layer are made up of the material that only allows hydrone to see through, for example Nafion; Fill absorbent material between inner and outer pipes or the ectonexine, like silica gel etc.Pipe or internal layer in gaseous sample is flowed through, portion of water wherein see through the selective permeation material of interior pipe or internal layer and are filled absorbent material absorption between inner and outer pipes or the ectonexine, thereby have reduced the relative humidity of the gaseous sample of flowing through.The gaseous sample dehumidifier can not omit when relative humidity influences whole sampling and detection system.
Preferably, said gas bubbler is arranged at the gas access pipeline and is communicated with the place with said sampling thief.
Preferably, said intake tunnel is aperture or slit, and the aperture of said aperture is 0.1 ~ 5mm, and the length of said slit is 0.1 ~ 1000mm, and width is 0.1 ~ 5mm.
Preferably, the latter half height of said sampling thief is 3 ~ 100cm.
Preferably, said detector is selected from photoionization detector, thermal conductivity detector (TCD), hydrogen flame detector, ionic mobility detecting device, mass detector and spectroscopic detector.Said detector mainly is that the composition in the purge gas is made evaluation.
Preferably, the detector inlet end also is provided with gas fractionation unit.Said gas fractionation unit is selected from gas chromatographic column etc.Said purge gas needs earlier through gas fractionation unit each component in the gas to be separated before getting into detector, makes that each component VOC successively gets into detector in the purge gas, to improve the accuracy of detection of detector.
Preferably, also be provided with at least one float on the lateral wall of the first half of said sampling thief.
The effect of said at least one float mainly is to make the latter half sampling thief be under the liquid level of tested water body fully and make cavity keep vertically (or roughly vertical), and makes that the first half sampling thief is inner to form a gas sample collection chamber.
Preferably, said sampling thief is the cylinder chamber body structure of hollow, and a said above float is on the same horizontal section of said cylinder chamber body structure, and the cross-sectional area of said cylindricality cavity is 1cm
2~ 1m
2, the height of said sampling thief the latter half is 1/4 ~ 9/10 with the ratio of the height overall of said sampling thief.
Preferably, the gas circuit from the gas sample collection chamber of sampling thief to detector in this device be fully with extraneous airtight isolation, and the resistance that gas exports from entering the mouth to is less.
Preferably, said detector also is communicated with said gas purging gas air intake pump, constitutes the loop of a closure between said gas access pipeline, sampling thief, gas vent pipeline and the detector.
Preferably; Said detector also is communicated with said gas purging gas air intake pump; Said gas purging gas air intake pump and said gaseous sample collecting pump are integrated, and constitute the loop of a closure between said gas access pipeline, sampling thief, gas vent pipeline and the detector.Purge gas in the sampling thief gets into detector after through gaseous sample collecting pump, gaseous sample dehumidifier and gas fractionation unit; Detect post-purge gas after the detector outflow; Arrive gas purging gas air intake pump through pipeline; Get into the gas access pipeline once more through gas purging gas air intake pump then, after through the purified purge gas device, get into sampling thief once more, realize the closed circulation of whole gas piping.Said gas purging gas air intake pump is substituted by the air pump that carries in the said detector.Make whole device compacter, small and exquisite after the integration.
Second aspect present invention provides a kind of method that detects volatile organic content in the water, uses aforesaid a kind of sampling and pick-up unit that is used for detecting the water volatile organic content, may further comprise the steps:
1) said sampling thief is placed water body to be measured, purge gas is gone in the sampling thief, get into again in the said detector and detect;
2) testing result and the standard specimen concentration curve that draw according to said detector obtain the concentration of volatile organic matter in the water body to be measured.
Preferably, step 1) is: said sampling thief is placed water body to be measured, purge gas is blown in the sampling thief through entrance pipe with gas purging gas air intake pump, get in the said detector through the gas vent pipeline and detect.
Preferably; Control purge gas flow in the pipeline of said gas access and be slightly larger than or equal the purge gas flow in the gas vent pipeline, the gas flow that the gas flow that gets into the sampling thief cavity is extracted out more than or equal to the gas sample collection chamber in the sampling thief cavity.
Preferably, the gas flow of controlling in the pipeline of said gas access is 1ml/min ~ 10L/min, and the volume that control gets into the inner water body of said sampling thief is 1ml ~ 1000L.
The volume of the inner water body of said entering sampling thief is made change according to the height and the sectional area of said sampling thief hypomere.
Thereby this design is guaranteed that the gas of gas sample collection chamber can not reduce gradually and is caused liquid level to rise even liquid is inhaled into gaseous sample export pipeline, gaseous sample dehumidifier and detector.When sampling thief bottom inflow flow equaled the top and goes out airshed, liquid level kept stable in the sampling thief cavity; When appearance device bottom inflow flow goes out airshed greater than the top; The gas that has more can make the interior liquid level of sampling thief cavity drop to the position that the sampling thief hypomere has aperture or slit; Then the sampling thief cavity of overflowing, but at this moment can not be affected from the process of gas sample collection chamber top gas bleeding sample.When the flow of the throughput ratio gas collecting pump of purge gas pump big when a lot, can be with sweep gas inlet port pipeline branch a part of flow that pours off.
Preferably, said purge gas is selected from nitrogen, air and inert gas.
Preferably, said purge gas purges after 5 seconds ~ 10 minutes (this be an equilibration time) water body to be measured in the sampling thief, restarts said detector and detect (or detecting device starts, behind purging gained data balancing reading of data) again before purging.
Preferably; Said purge gas also passes through purified treatment before getting into said sampling thief; When getting into said sampling thief, also handle through bubbling, said purge gas also passes through dehumidification treatments and gas separating treatment after blowing out said sampling thief, before getting into detector.
Said gas separating treatment is accomplished through the gas fractionation units such as gas chromatographic column that are positioned at the detecting device inlet end.
Said purified treatment is accomplished through the purified purge gas device that is positioned on the pipeline of said gas access.
It is through being positioned at the gas access pipeline is communicated with the place with said sampling thief gas bubbler completion that said bubbling is handled,
Said dehumidification treatments is accomplished through the gaseous sample dehumidifier that is positioned on the said gas vent pipeline.
The sample detecting method of volatile organic matter and the principle of pick-up unit are in a kind of water provided by the present invention: the purge gas that the sampling thief bottom bloats is after bubbling is handled; Bubble carries the volatile organic matter in the tested water; Converge in the sampling thief epimere gas sample collection chamber, be introduced into the dehumidifying of gaseous sample dehumidifier and get into detector again and carry out the concentration detection.Each interface is provided with the air seal mode.According to design of the present invention, the escaping gas concentration of from tested water body, being taken out of by the purge gas bubbling is near-linear dependency near head space gas-liquid equilibrium concentration and with its content in water.Before experiment; Need the standard specimen of required each concentration of VOC be detected; With the detected value of confirming this VOC gas and the linear relationship of actual concentrations, when actual detected, thereby can obtain the concentration of organic volatile organic matter in the water body to be measured through conversion Calculation through its detected value.The detection lower limit of organic volatile contact scar quality testing survey equipment can reach μ g/L level even lower in the water of the present invention.
The inventor finds after testing; The sample detecting method of volatile organic matter and pick-up unit have following beneficial effect in a kind of water provided by the present invention: need not be with the water sample extraction; Can directly sampling thief be put into water, the volatile organic matter that just can gather in the water gets into the detecting device detection that links to each other; Water in the cavity at any time all with water body in water freely exchange, thereby can not cause wherein tested volatile organic matter concentration with constantly being extracted and reduce because of sampling, guaranteed accuracy and the continuation measured.
Description of drawings
Fig. 1 is the sampling of volatile organic content in the detection water of the present invention and the structural representation of pick-up unit.
Fig. 2 is the testing result linearity synoptic diagram of the present invention to methyl tert-butyl ether in the water body (MTBE).
Fig. 3 is the testing result linearity synoptic diagram of the present invention to other kinds VOC in the water body.
The element numbers explanation
1 intake tunnel
2 detectors
3 sampling thiefs
4 gas access pipelines
5 gas vent pipelines
6 gas purging gas air intake pumps
7 gaseous sample collecting pumps
8 purified purge gas devices
9 gaseous sample dehumidifiers
10 gas bubblers
11 floats
12 gas sample collection chamber
The outlet of 13 gaseous samples
Embodiment
Below through specific instantiation embodiment of the present invention is described, those skilled in the art can understand other advantages of the present invention and effect easily by the content that this instructions disclosed.The present invention can also implement or use through other different embodiment, and each item details in this instructions also can be based on different viewpoints and application, carries out various modifications or change under the spirit of the present invention not deviating from.
See also Fig. 1 to Fig. 3.Need to prove; The diagram that is provided in the present embodiment is only explained basic conception of the present invention in a schematic way; So only show in graphic with the present invention in relevant assembly but not component count, shape and plotted when implementing according to reality; Kenel, quantity and the ratio of each assembly can be a kind of random change during its actual enforcement, and its assembly layout kenel also maybe be more complicated.
A kind of sampling and pick-up unit that is used for detecting the water volatile organic content as shown in Figure 1; Comprise the sampling thief 3 of a hollow and the detector 2 that links to each other with sampling thief 3; The sidewall of sampling thief 3 the latter halfs is provided with more than one intake tunnel 1, and the lower end is provided with gas bubbler 10.
Intake tunnel 1 is enough little, makes bubble not overflow from it, and these intake tunnels also can change the web plate of the pore structure of the effect that can reach identical into.
The effect of gas bubbler 10 is to make the purge gas that gets into cavity be divided into one or more micro-bubbles; Gas bubbler 10 can be one or one group of aperture or porosint; Purge gas is divided into micro-bubble can increases the gas-liquid contact area that gets into the gas in the sampling thief; Improve the concentration of VOC in the purge gas, make testing result more accurate.
Concrete; Also comprise gas access pipeline 4, gas vent pipeline 5 and gas sweep gas air intake pump 6; Pipeline 4 one ends in gas access are communicated with sampling thief 3 bottoms; The other end is connected with gas purging gas air intake pump 6, and gas vent pipeline 5 one ends are communicated with sampling thief 3 tops, and the other end links to each other with detector 2.
Concrete, gas vent pipeline 5 is provided with gaseous sample collecting pump 7.
Concrete, also be provided with purified purge gas device 8 on the gas access pipeline 4.Purified purge gas device 8 is used for removing the impurity of purge gas for filling the filtrator of adsorbent.When confirm purge gas this during as the clean air that do not influence detection the purified purge gas device can omit.The material that gas outlet tube route Teflon etc. does not adsorb organic volatile promoting the circulation of qi body is processed; Make gaseous sample reduce detectable concentration or postpone detection time causing, the volatile organic matter desorption of absorption in the time of also can not detecting and influence the result who detects next time because of last time through not adsorbing in the process of pipeline.
Concrete, also be provided with gaseous sample dehumidifier 9 on the gas vent pipeline 5.Gaseous sample dehumidifier 9 is made up of a sleeve pipe or interlayer pipeline; Outer tube or the outer encapsulant that can not be passed through by gas are formed, and interior pipe or internal layer are made up of the material that only allows hydrone to see through, for example Nafion; Fill absorbent material between inner and outer pipes or the ectonexine, like silica gel etc.Pipe or internal layer in gaseous sample is flowed through, portion of water wherein see through the selective permeation material of interior pipe or internal layer and are filled absorbent material absorption between inner and outer pipes or the ectonexine, thereby have reduced the relative humidity of the gaseous sample of flowing through.The gaseous sample dehumidifier can not omit when relative humidity influences whole sampling and detection system.
Concrete, gas bubbler 10 is arranged at gas access pipeline 4 and is communicated with the place with sampling thief 3.
Concrete, intake tunnel 1 is aperture or slit, said aperture be shaped as circle, the aperture of said aperture is 0.1 ~ 5mm, the length of said slit is 0.1 ~ 1000mm, width is 0.1 ~ 5mm.Intake tunnel 1 on the said sampling thief is enough little, makes bubble not overflow from it, and what these intake tunnels also can change the effect that can reach identical into has a certain width (web plate of 0.1 ~ 5mm) slit or certain pore structure.The hole area of said intake tunnel should reach 3mm
2More than, so that the water body in the sampling thief can be in time and the outer water body exchange to be measured of sampling thief, accurate with the assurance measurement result.
Concrete, the latter half height of sampling thief 3 is 3 ~ 100cm.
Concrete, detector 2 is selected from photoionization detector, thermal conductivity detector (TCD), hydrogen flame detector, ionic mobility detecting device, mass detector and spectroscopic detector.Detector 2 mainly is that the gas componant and the content that get in the purge gas in this detecting device are made evaluation, according to the kind of the detector of concrete selection, can make qualitative or quantitative evaluation respectively to the composition and/or the content of this gas.
Concrete, detector 2 inlet ends also are provided with gas fractionation unit.Gas fractionation unit is selected from gas chromatographic column etc.Said purge gas needs earlier through gas fractionation unit each component in the gas to be separated before getting into detector 2, makes that each component VOC successively gets into detector 2 in the purge gas, to improve the accuracy of detection of detector 2.
Concrete, also be provided with at least one float 11 on the lateral wall of the first half of sampling thief 3.Said float 11 can keep sampling thief 3 vertical (or roughly vertical); The latter half of sampling thief 3 is under the liquid level of tested water body fully; And stable gas sample collection chamber of the inner formation of the first half that makes sampling thief 3, and the total amount of water body keeps stablizing in liquid level in assurance sampling thief 3 cavitys and sampling thief 3 cavitys.
Concrete, sampling thief 3 is the cylinder chamber body structure of hollow, and an above float 11 is on the same horizontal section of said cylinder chamber body structure, and the cross-sectional area of said cylindricality cavity is 1cm
2~ 1m
2, the height of sampling thief 3 the latter halfs is 1/4 ~ 9/10 with the ratio of the height overall of sampling thief 3.
Concrete, detector 2 also is communicated with said gas purging gas air intake pump, constitutes the loop of a closure between said gas access pipeline, sampling thief, gas vent pipeline and the detector.
Concrete; This device is when perfect condition; Sampling thief bottom inflow flow equals the top and goes out airshed, and the gas sample collection chamber 12 of sampling thief 3 is complete and extraneous airtight isolation to the gas circuit of detector 2, and the resistance that gas exports from entering the mouth to is less.Less resistance has guaranteed that the gaseous tension in the sample collection room does not have bigger variation in the cavity, thereby makes the content of VOC in the purge gas can be because of the corresponding change of air pressure change, and liquid level keeps stable in the sampling thief cavity, makes measurement result more accurate.When sampling thief bottom inflow flow goes out airshed greater than the top; The gas that has more can make the interior liquid level of sampling thief cavity drop to the position that the sampling thief hypomere has aperture or slit; Then the sampling thief cavity of overflowing, but at this moment can not be affected from the process of gas sample collection chamber top gas bleeding sample.When the flow of the throughput ratio gas collecting pump of purge gas pump big when a lot, can be with sweep gas inlet port pipeline branch a part of flow that pours off.
Concrete, said gas purging gas air intake pump is substituted by the air pump that carries in the said detector.Gas purging gas air intake pump 6 is integrated with gaseous sample collecting pump 7; Said gas purging gas air intake pump 6 is integrated the back with gaseous sample collecting pump 7 and is accomplished by the same air pump in the photoionization detector; Purge gas is not provided with special steel cylinder gas; Directly use the air in the pipeline to get final product, make the light compactness of whole device through purifying, can carry bring to any doubtful contaminated or confirmed to detect in the contaminated water body the wherein concentration of organic volatile contact scar thing.Whole gas piping is the loop of a closure.Purge gas in the sampling thief 3 gets into detector 2 after through gaseous sample collecting pump 7, gaseous sample dehumidifier 9 and gas fractionation unit; Detect post-purge gas after detector 2 outflows; Arrive gas purging gas air intake pump 6 through pipeline; Get into gas access pipeline 4 once more through gas purging gas air intake pump 6 then, after through purified purge gas device 8, get into sampling thief 3 once more, realize the closed circulation of whole gas piping.Make whole device compacter, small and exquisite after the integration.
The present invention states sampling and pick-up unit when detecting the content of volatile organic matter in the water in the use, at first should draw the standard specimen concentration curve.This standard specimen concentration curve can be obtained by following method:
1) preparation standard specimen solution: various VOC are mixed with the WS respectively with gradient concentration;
2) detection of standard specimen solution: use above-mentioned sampling and pick-up unit, detect the content of VOC in each standard specimen solution of being prepared in the step 1);
3) drafting of typical curve: the concentration with the standard specimen solution of said preparation is horizontal ordinate, with step 2) in detect VOC in the standard specimen solution that obtains content be ordinate, draw out the standard specimen concentration curve.
The measurable gas of the present invention comprises VOCs such as methyl tert-butyl ether, benzene, zellon, triclene, vinyl acetate and isooctane.
The concentration range of VOC is in the water body to be measured: 0.1 ~ 10
6μ g/L.
Test example 1:
Detection to methyl tert-butyl ether in the water body (MTBE):
As shown in Figure 1, adopt photoionization detector as detector, this detector is handheld; Sampling thief is cylindrical, and float is the stationary installation of sampling thief, is positioned at 2/3 place of sampling thief height overall; Intake tunnel be shaped as circle, diameter is 0.1 ~ 5mm.
The gas flow of controlling in the pipeline of said gas access is 100 ~ 500ml/min, and the volume that control gets into the inner water body of said sampling thief is 300 ~ 800ml.The purge gas flow of gas access pipeline is slightly larger than or equals the purge gas flow of gas vent pipeline, and purge gas before getting into sampling thief, carries out purified treatment and bubbling is handled, and before getting into detector, also handles and separating treatment through gas dehumidification.Purge gas is restarted said detector and is detected after water body to be measured purged 0.5 ~ 3 minute in the sampling thief.
Enumerated corresponding results when using this model machine to detect the methyl tert-butyl ether (MTBE) in the standard specimen water body in the table 1.Test is carried out in the pond, laboratory, after pick-up unit is ready, pours the MTBE solution that configures into pond; Sampling thief is put into the pond to begin to detect; Each standard specimen carries out reading respectively 3 times, and the detected reading of PID is the concentration that gets into VOC in the gas of detector, and unit is ppb.Testing result shows that the concentration of VOC presents good corresponding relation in said PID reading (being the concentration of VOC in the gas) and the water, and the testing result of each concentration also presents good linearity (Conc. μ g/L is the concentration of standard specimen solution in the table).This device even when being used to detect the MBTE of low concentration (7.4 μ g/L), can both show favorable linearity, as shown in Figure 2.
Table 1
Can set up the standard specimen concentration curve of MTBE through the data in the table 1, as shown in Figure 2, wherein, the concentration of standard specimen solution is the x axle, and detecting the standard specimen solution PID reading that obtains is the y axle, obtains standard specimen concentration curve equation: y=5.7561x+1.8626, R
2=0.9971.
When MTBE concentration detects in to water body to be measured, PID reading that can be measured according to water body to be measured, through standard specimen concentration curve equation, the corresponding actual concentrations of confirming MTBE in this water body to be measured.
Test example 2:
This device can detect multiple VOC, this instance adopt with test example 1 in identical method and install and measured the concrete content of benzene, zellon, triclene, vinyl acetate and isooctane in the water body respectively, and drawn corresponding standard specimen concentration curve.The testing result of these VOC is listed in the table below 2:
Table 2
Can set up the standard specimen concentration curve of various VOC through the data in the table 2, as shown in Figure 3.Can find out that by Fig. 3 corresponding different VOC detection sensitivities is different,, can convert by the corresponding coefficient of this VOC that has obtained before when we know the kind time-like of VOC in the water.When not knowing the VOC exact nature, testing result is a VOC total amount roughly.
Test example 3
This device is the total amount roughly of multiple VOC in the fast detecting water body at the scene; This instance adopt with test example 1 in the identical method and the VOC total amount of installing different test points in the river in the open air, the place is that certain essence factory is positioned near the sewage draining exit of certain section, at the sewage draining exit upper reaches 10 meters respectively; 10 meters in downstream; 50 meters in downstream, 2 meters the korneforos apart from the bank at 200 meters, downstream are carried out the scene and are detected, and each test only needed 2 ~ 5 minutes can obtain testing result.Testing result is listed in the table below 3:
Table 3
| The position | Pure water | 10 meters at the upper reaches | 10 meters in downstream | 50 meters in downstream | 200 meters in downstream |
| PID?reading， |
0 | 253 | 910 | 762 | ?587 |
| VOC concentration *, μ g/ |
0 | 28 | 101 | 85 | ?65 |
*: by MTBE VOC concentration in the water of criterion calculation, 9.0ppb=1 μ g/L
Data declaration through table 3; This device can be in maybe contaminated water body on-site rapid measurement VOC total amount; To polluting daily and monitoring at random; Accident such as chemical leakage, crude oil leakage etc. cause the water pollution status on-site fast detecting under the situation such as water pollution and dangerous material diffusion with rapid assessment aspect very big practical value to be arranged.
In sum, the sample detecting device of volatile organic matter has effectively overcome various shortcoming of the prior art and the tool high industrial utilization in the water provided by the present invention.
The foregoing description is illustrative principle of the present invention and effect thereof only, but not is used to limit the present invention.Any be familiar with this technological personage all can be under spirit of the present invention and category, the foregoing description is modified or is changed.Therefore, have common knowledge the knowledgeable in the affiliated such as technical field, must contain by claim of the present invention not breaking away from all equivalence modifications of being accomplished under disclosed spirit and the technological thought or changing.
Claims (17)
1. a sampling and pick-up unit that is used for detecting the water volatile organic content; It is characterized in that; Comprise the sampling thief of a hollow and the detector that links to each other with sampling thief, the sidewall of said sampling thief the latter half is provided with more than one intake tunnel, and the lower end is provided with the gas bubbler.
2. the sampling and the pick-up unit of volatile organic content in the water according to claim 1; It is characterized in that; Also comprise gas access pipeline, the gentle body sweep gas of gas vent pipeline air intake pump, said gas access pipeline one end is communicated with said sampling thief bottom, and the other end is connected with said gas purging gas air intake pump; Said gas vent pipeline one end is communicated with said sampling thief top, and the other end links to each other with said detector.
3. a kind of sampling and pick-up unit that is used for detecting the water volatile organic content as claimed in claim 2 is characterized in that said gas vent pipeline is provided with the gaseous sample collecting pump.
4. a kind of sampling and pick-up unit that is used for detecting the water volatile organic content as claimed in claim 2 is characterized in that, also is provided with the purified purge gas device on the pipeline of said gas access; Also be provided with the gaseous sample dehumidifier on the said gas vent pipeline.
5. a kind of sampling and pick-up unit that is used for detecting the water volatile organic content as claimed in claim 2 is characterized in that said gas bubbler is arranged at the gas access pipeline and is communicated with the place with said sampling thief.
6. a kind of sampling and pick-up unit that is used for detecting the water volatile organic content as claimed in claim 1; It is characterized in that said intake tunnel is aperture or slit, the aperture of said aperture is 0.1 ~ 5mm; The length of said slit is 0.1 ~ 1000mm, and width is 0.1 ~ 5mm.
7. a kind of sampling and pick-up unit that is used for detecting the water volatile organic content as claimed in claim 1 is characterized in that the latter half height of said sampling thief is 3 ~ 100cm.
8. a kind of sampling and pick-up unit that is used for detecting the water volatile organic matter as claimed in claim 1; It is characterized in that said detector is selected from photoionization detector, thermal conductivity detector (TCD), hydrogen flame detector, ionic mobility detecting device, mass detector and spectroscopic detector.
9. like arbitrary described a kind of sampling and the pick-up unit that is used for detecting the water volatile organic content of claim 1-8, it is characterized in that, also be provided with at least one float on the lateral wall of the first half of said sampling thief.
10. a kind of sampling and pick-up unit that is used for the water volatile organic matter as claimed in claim 9; It is characterized in that; Said sampling thief is the cylinder chamber body structure of hollow; A said above float is on the same horizontal section of said cylinder chamber body structure, and the cross-sectional area of said cylindricality cavity is 1cm
2~ 1m
2, the height of said sampling thief the latter half is 1/4 ~ 9/10 with the ratio of the height overall of said sampling thief.
11. like arbitrary described a kind of sampling and pick-up unit that is used for the water volatile organic matter in claim 1-8 or 10; It is characterized in that; Said detector also is communicated with said gas purging gas air intake pump, constitutes the loop of a closure between said gas access pipeline, sampling thief, gas vent pipeline and the detector.
12. a kind of sampling and pick-up unit that is used for the water volatile organic matter as claimed in claim 11 is characterized in that, said gas purging gas air intake pump is substituted by the air pump that carries in the said detector.
13. use such as the arbitrary described sampling of claim 1-12 and pick-up unit detect the method for volatile organic content in the water, may further comprise the steps:
1) said sampling thief is placed water body to be measured, purge gas is blown in the sampling thief, get into again in the said detector and detect;
2) testing result and the standard specimen concentration curve that draw according to said detector obtain the concentration of volatile organic matter in the water body to be measured.
14. the method for volatile organic content in the detection water as claimed in claim 13; It is characterized in that; Step 1) is: said sampling thief is placed water body to be measured; Purge gas is blown in the sampling thief through entrance pipe with gas purging gas air intake pump, gets in the said detector through the gas vent pipeline again and detect.
15. the method for volatile organic content is characterized in that in the detection water as claimed in claim 14, controls purge gas flow in the pipeline of said gas access and is slightly larger than or equals the purge gas flow in the gas vent pipeline.
16. the method for volatile organic content is characterized in that in the detection water as claimed in claim 14, the gas flow of controlling in the pipeline of said gas access is 1ml/min ~ 10L/min, and the volume that control gets into the inner water body of said sampling thief is 1ml ~ 1000L.
17. the method for volatile organic content is characterized in that in the detection water as claimed in claim 13, said purge gas is selected from nitrogen, air and inert gas.
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| CN201210223247.0A CN102721579B (en) | 2012-06-29 | 2012-06-29 | Device for sampling and detecting volatile organic matter in water |
| EP13809554.2A EP2833117B1 (en) | 2012-06-29 | 2013-06-28 | Sampling and detection device for volatile organic compound in water |
| US14/395,576 US9983182B2 (en) | 2012-06-29 | 2013-06-28 | Device for sampling and detecting volatile organic compounds in water |
| PCT/CN2013/078310 WO2014000685A1 (en) | 2012-06-29 | 2013-06-28 | Sampling and detection device for volatile organic compound in water |
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