CN202735137U - Device for sampling and detecting volatile organic compound in water - Google Patents
Device for sampling and detecting volatile organic compound in water Download PDFInfo
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- CN202735137U CN202735137U CN 201220313875 CN201220313875U CN202735137U CN 202735137 U CN202735137 U CN 202735137U CN 201220313875 CN201220313875 CN 201220313875 CN 201220313875 U CN201220313875 U CN 201220313875U CN 202735137 U CN202735137 U CN 202735137U
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Abstract
The utility model relates to the field of detection instruments, and in particular relates to a device for sampling and detecting the content of a volatile organic compound in water. The device comprises a hollow sampler and a gas detector which is connected with the sampler, wherein more than one water intake channel is arranged on the side wall of the half lower part of the sampler; and a gas bubbler is arranged at the lower end of the sampler. By utilizing the detecting device provided by the utility model, the on-site test is convenient, and at the same time, the accuracy and the persistence in measurement are ensured.
Description
Technical field
The utility model relates to a kind of detecting instrument field, particularly relates to a kind of sampling detector for multifunctional that detects volatile organic content in the water.
Background technology
Multiple volatile organic matter can enter by the various approach such as discharging, leakage, diffusion in the environment waters 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 large 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 of volatile organic contaminant in the water become 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.For some incidents of leakage, we must take emergency measures, and cut off as early as possible the propagation of polluting, and determine 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 the poor accuracy, apparatus expensive of measurement result, the problem such as Portable belt not.
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 the methods such as (such as US Patent No. 2011/094105A1), enrichment (such as US Patent No. 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 occurs the water body composition.In addition, the 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 better than the above-mentioned method of sampling, and US Patent No. 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, takes out of detected thereby be diluted air-flow.US Patent No. 5448922 discloses a kind of gas permeation 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, is subjected to the material of film, length, and the sectional area impact is very large, is subjected to the pressure influence of system also larger.Therefore reliability is not high, and the structure very complicated.As seen, up to the present, the device of efficient, quick, portable, the reliable Site Detection Volatile Organic Compounds In Water of energy is arranged not yet.
The utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model is to provide a kind of efficient, quick, portable, reliable a kind of pick-up unit that detects volatile organic content in the water.
The utility model provides a kind of sampling for detection of volatile organic content in the water and pick-up unit, comprise the sampling thief of a hollow and the detector that links to each other with sampling thief, the sidewall of described sampling thief the latter half is provided with more than one intake tunnel, and the lower end is provided with the gas sparging device.
The effect of described gas sparging device is to make the purge gas that enters cavity be divided into one or more micro-bubbles, and bubbler can be one or one group of aperture or porosint.
Described intake tunnel is enough little, so that bubble can not overflow from it, 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 described intake tunnel should reach 3mm
2Above, 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, described gas access pipeline one end is communicated with described sampling thief bottom, the other end is connected with described gas purging gas air intake pump, described gas vent pipeline one end is communicated with described sampling thief top, and the other end links to each other with described detector.
Preferably, described 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 described gas access.Described 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 affect 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 made, make gaseous sample reduce detectable concentration or postpone detection time causing through not adsorbing in the process of pipeline, the volatile organic matter desorption of absorption in the time of also can not detecting because of last time and affect the result who detects next time.
Preferably, also be provided with the gaseous sample dehumidifier on the described gas vent pipeline.Described gaseous sample dehumidifier is comprised of a sleeve pipe or interlayer pipeline, outer tube or the outer encapsulant that can not be passed through by gas form, and inner tube or internal layer are comprised of the material that only allows hydrone to see through, for example Nafion, fill absorbent material between inner and outer pipes or the ectonexine, such as silica gel etc.Gaseous sample flow through inner tube or internal layer, portion of water wherein see through the selectivity permeable material of inner tube 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 affects whole sampling and detection system.
Preferably, described gas sparging device is arranged at gas access pipeline and described sampling thief connectivity part.
Preferably, described intake tunnel is aperture or slit, and the aperture of described aperture is 0.1 ~ 5mm, and the length of described slit is 0.1 ~ 1000mm, and width is 0.1 ~ 5mm.
Preferably, the latter half height of described sampling thief is 3 ~ 100cm.
Preferably, described detector is selected from photoionization detector, thermal conductivity detector (TCD), hydrogen flame detector, ion mobility detector, mass detector and spectroscopic detector.Described 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.Described gas fractionation unit is selected from gas chromatographic column etc.Described purge gas need pass through first gas fractionation unit before entering detector, each component in the gas is separated, and makes that each component VOC successively enters 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 described sampling thief.
The effect of described 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, described sampling thief is the cylinder chamber body structure of hollow, and a described above float is on the same level cross section of described cylinder chamber body structure, and the cross-sectional area of described cylindricality cavity is 1cm
2~ 1m
2, the height of described sampling thief the latter half is 1/4 ~ 9/10 with the ratio of the height overall of described 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 gas resistance from the inlet to the outlet is less.
Preferably, described detector also is communicated with described gas purging gas air intake pump, consists of the loop of a closure between described gas access pipeline, sampling thief, gas vent pipeline and the detector.
Preferably, described detector also is communicated with described gas purging gas air intake pump, described gas purging gas air intake pump and described gaseous sample collecting pump are integrated, and consist of the loop of a closure between described gas access pipeline, sampling thief, gas vent pipeline and the detector.Purge gas in the sampling thief enters 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, then again enter the gas access pipeline by gas purging gas air intake pump, after through the purified purge gas device, again enter sampling thief, realize the closed circulation of whole gas piping.Described gas purging gas air intake pump is substituted by the air pump that carries in the described detector.Integrate rear so that whole device is compacter, small and exquisite.
So the sampling that the utility model provides and pick-up unit can be applied to detect volatile organic content in the water, concrete grammar may further comprise the steps:
1) described sampling thief is placed water body to be measured, purge gas is blown in the sampling thief, enter again in the described detector and detect;
2) testing result and the standard specimen concentration curve that draw according to described detector obtain the concentration of volatile organic matter in the water body to be measured.
Preferably, step 1) is: described sampling thief is placed water body to be measured, purge gas is blown in the sampling thief by entrance pipe with gas purging gas air intake pump, enter in the described detector by the gas vent pipeline and detect.
Preferably, control purge gas flow in the pipeline of described gas access and be slightly larger than or equal purge gas flow in the gas vent pipeline, the gas flow that the gas flow that enters 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 described gas access is 1ml/min ~ 10L/min, and the volume that control enters the inner water body of described sampling thief is 1ml ~ 1000L.
The described volume that enters the inner water body of sampling thief is made corresponding the variation according to height and the sectional area of described 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 sample 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 collection pump of purge gas pump is much larger, sweep gas inlet port pipeline flow dividing can be fallen a part of flow.
Preferably, described purge gas is selected from nitrogen, air and inert gas.
Preferably, described purge gas purges after 5 seconds ~ 10 minutes (this be equilibration time) water body to be measured in the sampling thief, restarts described detector and detect (or detecting device starts, after purging the data obtained balance again reading out data) before purging.
Preferably, described purge gas also passes through purified treatment before entering described sampling thief, also process through bubbling when entering described sampling thief, described purge gas also passes through dehumidification treatments and gas separating treatment after blowing out described sampling thief, before entering detector.
Described gas separating treatment is finished by the gas fractionation units such as gas chromatographic column that are positioned at the detecting device inlet end.
Described purified treatment is finished by the purified purge gas device that is positioned on the pipeline of described gas access.
It is to finish by the gas sparging device that is positioned at gas access pipeline and described sampling thief connectivity part that described bubbling is processed,
Described dehumidification treatments is finished by the gaseous sample dehumidifier that is positioned on the described 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 utility model: the purge gas that the sampling thief bottom bloats is after bubbling is processed, 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 enter again detector and carry out the concentration detection.Each interface is provided with the air seal mode.According to design of the present utility model, the escaping gas concentration of being taken out of from tested water body 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 to the standard specimen of required each concentration of VOC be detected, with the detected value of definite this VOC gas and the linear relationship of actual concentrations, when reality detects, obtain the organic concentration of volatile organic in the water body to be measured thereby can calculate through conversion by its detected value.The detection lower limit of volatile organic pollutant monitoring equipment can reach μ g/L level even lower in the water of the present utility model.
The inventor finds after experiment, the sample detecting method of volatile organic matter and pick-up unit have following beneficial effect in a kind of water provided by the utility model: 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 enters continuous detecting device detection; Water in the cavity at any time all with water body in the water free 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 utility model and the structural representation of pick-up unit.
Fig. 2 is that the utility model is to the linear schematic diagram of the testing result of Determination of MTBE in Water (MTBE).
Fig. 3 is that the utility model is to the linear schematic diagram of the testing result of 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 sparging devices
11 floats
12 gas sample collection chamber
The outlet of 13 gaseous samples
Embodiment
Below by specific instantiation embodiment of the present utility model is described, those skilled in the art can understand other advantages of the present utility model and effect easily by the disclosed content of this instructions.The utility model can also be implemented or be used by other different embodiment, and the every 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 utility model not deviating from.
See also Fig. 1 to Fig. 3.Need to prove, the diagram that provides in the present embodiment only illustrates basic conception of the present utility model in a schematic way, so only show in graphic with the utility model in relevant assembly but not component count, shape and size drafting 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 may be more complicated.
As shown in Figure 1 a kind of sampling and pick-up unit for detection of volatile organic content in the water, 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 sparging device 10.
The effect of gas sparging device 10 is to make the purge gas that enters cavity be divided into one or more micro-bubbles, gas sparging device 10 can be one or one group of aperture or porosint, purge gas is divided into the gas-liquid contact area that micro-bubble can increase the gas that enters 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, 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 affect 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 made, make gaseous sample reduce detectable concentration or postpone detection time causing through not adsorbing in the process of pipeline, the volatile organic matter desorption of absorption in the time of also can not detecting because of last time and affect the result who detects next time.
Concrete, also be provided with gaseous sample dehumidifier 9 on the gas vent pipeline 5.Gaseous sample dehumidifier 9 is comprised of a sleeve pipe or interlayer pipeline, outer tube or the outer encapsulant that can not be passed through by gas form, and inner tube or internal layer are comprised of the material that only allows hydrone to see through, for example Nafion, fill absorbent material between inner and outer pipes or the ectonexine, such as silica gel etc.Gaseous sample flow through inner tube or internal layer, portion of water wherein see through the selectivity permeable material of inner tube 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 affects whole sampling and detection system.
Concrete, gas sparging device 10 is arranged at gas access pipeline 4 and sampling thief 3 connectivity parts.
Concrete, intake tunnel 1 is aperture or slit, described aperture be shaped as circle, the aperture of described aperture is 0.1 ~ 5mm, the length of described slit is 0.1 ~ 1000mm, width is 0.1 ~ 5mm.Intake tunnel 1 on the described sampling thief is enough little, so that bubble can not overflow from it, 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 described intake tunnel should reach 3mm
2Above, 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, ion mobility detector, mass detector and spectroscopic detector.Detector 2 mainly is that the gas componant and the content that enter in the purge gas in this detecting device are made evaluation, according to the kind of the detector of concrete selection, can make respectively qualitative or Quantitative measurement to 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.Described purge gas need pass through first gas fractionation unit before entering detector 2, each component in the gas is separated, and makes that each component VOC successively enters 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.Described 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 the 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 level cross section of described cylinder chamber body structure, and the cross-sectional area of described 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 described gas purging gas air intake pump, consists of the loop of a closure between described 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 gas resistance from the inlet to the outlet is less.Less resistance has guaranteed that the gaseous tension in the sample collection room does not have larger 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 collection pump of purge gas pump is much larger, sweep gas inlet port pipeline flow dividing can be fallen a part of flow.
Concrete, described gas purging gas air intake pump is substituted by the air pump that carries in the described detector.Gas purging gas air intake pump 6 is integrated with gaseous sample collecting pump 7, described gas purging gas air intake pump 6 is finished by the same air pump in the photoionization detector after integrating with gaseous sample collecting pump 7, purge gas does not arrange special steel cylinder gas, directly use the air in the pipeline to get final product through purifying, make the light compactness of whole device, can carry bring to any doubtful contaminated or confirmed to detect in the contaminated water body the wherein concentration of volatile organic pollutant.Whole gas piping is the loop of a closure.Purge gas in the sampling thief 3 enters 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, then again enter gas access pipeline 4 by gas purging gas air intake pump 6, after through purified purge gas device 8, again enter sampling thief 3, realize the closed circulation of whole gas piping.Integrate rear so that whole device is compacter, small and exquisite.
The utility model is stated 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 respectively the aqueous solution with gradient concentration;
2) content of VOC in each standard specimen solution of preparing the detection of standard specimen solution: use above-mentioned sampling and pick-up unit, detecting step 1);
3) content that detects VOC in the standard specimen solution that obtains the drafting of typical curve: take the concentration of the standard specimen solution of described preparation as horizontal ordinate, take step 2) is drawn out the standard specimen concentration curve as ordinate.
The measurable gas of the utility model comprises the volatile organic gas 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 ~ 106 μ g/L.
Test example 1:
Detection to Determination of MTBE in Water (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 described gas access is 100 ~ 500ml/min, and the volume that control enters the inner water body of described 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 carries out purified treatment before entering sampling thief and bubbling is processed, and also processes and separating treatment through gas dehumidification before entering detector.Purge gas is restarted described detector and is detected after water body to be measured purges 0.5 ~ 3 minute in the sampling thief.
Corresponding result when having enumerated the methyl tert-butyl ether (MTBE) that uses in this model machine detection standard specimen water body in the table 1.Test is carried out in laboratory water tank, 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 respectively reading 3 times, and the reading that PID detects is the concentration that enters VOC in the gas of detector, and unit is ppb.Testing result shows, the concentration of VOC presents good corresponding relation in described 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 for detection of the MBTE of low concentration (7.4 μ g/L) time, can both show good linearity, as shown in Figure 2.
Table 1
Can set up the standard specimen concentration curve of MTBE by 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, by standard specimen concentration curve equation, the corresponding actual concentrations of determining MTBE in this water body to be measured.
Test example 2:
This device can detect multiple VOC, this example adopt with test example 1 in identical method and install and measured respectively the concrete content of benzene, zellon, triclene, vinyl acetate and isooctane in the water body, 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 by the data in the table 2, as shown in Figure 3.As seen from Figure 3, corresponding different VOC detection sensitivities is different, when we know the kind of VOC in the water, can convert by coefficient corresponding to this VOC that has obtained before.When not knowing the VOC exact nature, testing result is 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 example adopt from test example 1 in 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, in the sewage draining exit upstream 10 meters respectively, 10 meters in downstream, 50 meters in downstream, Site Detection is carried out in 2 meters the korneforos apart from the bank at 200 meters, downstream, 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 | |
10 meters of upstreams | 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 |
*: be VOC concentration in the water of criterion calculation by MTBE, 9.0ppb=1 μ g/L
Data declaration by table 3, this device can be in may contaminated water body on-site rapid measurement VOC total amount, to polluting daily and random monitoring, accident such as chemical leakage, crude oil leakage etc. cause water pollution status on-site fast detecting and the rapid assessment aspect in the situations such as water pollution and dangerous material diffusion that very large practical value is arranged.
In sum, the sampling detector for multifunctional 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 utility model.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not is used for restriction the utility model.Any person skilled in the art scholar all can be under spirit of the present utility model and category, and above-described embodiment is modified or changed.Therefore, have in the technical field under such as and know that usually the knowledgeable modifies or changes not breaking away from all equivalences of finishing under spirit that the utility model discloses and the technological thought, must be contained by claim of the present utility model.
Claims (12)
1. sampling and pick-up unit for detection of a volatile organic content in the water, 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 described sampling thief the latter half is provided with more than one intake tunnel, and the lower end is provided with the gas sparging device.
2. as claimed in claim 1 sampling and the pick-up unit of volatile organic content in the water, it is characterized in that, also comprise gas access pipeline, the gentle body sweep gas of gas vent pipeline air intake pump, described gas access pipeline one end is communicated with described sampling thief bottom, the other end is connected with described gas purging gas air intake pump, described gas vent pipeline one end is communicated with described sampling thief top, and the other end links to each other with described detector.
3. a kind of sampling and pick-up unit for detection of volatile organic content in the water as claimed in claim 2 is characterized in that, described gas vent pipeline is provided with the gaseous sample collecting pump.
4. a kind of sampling and pick-up unit for detection of volatile organic content in the water as claimed in claim 2 is characterized in that, also are provided with the purified purge gas device on the pipeline of described gas access; Also be provided with the gaseous sample dehumidifier on the described gas vent pipeline.
5. a kind of sampling and pick-up unit for detection of volatile organic content in the water as claimed in claim 2 is characterized in that, described gas sparging device is arranged at gas access pipeline and described sampling thief connectivity part.
6. a kind of sampling and pick-up unit for detection of volatile organic content in the water as claimed in claim 1, it is characterized in that, described intake tunnel is aperture or slit, and the aperture of described aperture is 0.1 ~ 5mm, the length of described slit is 0.1 ~ 1000mm, and width is 0.1 ~ 5mm.
7. a kind of sampling and pick-up unit for detection of volatile organic content in the water as claimed in claim 1 is characterized in that, the latter half height of described sampling thief is 3 ~ 100cm.
8. a kind of sampling and pick-up unit for detection of volatile organic matter in the water as claimed in claim 1, it is characterized in that, described detector is selected from photoionization detector, thermal conductivity detector (TCD), hydrogen flame detector, ion mobility detector, mass detector and spectroscopic detector.
9. such as claim 1-8 arbitrary described a kind of sampling and pick-up unit for detection of volatile organic content in the water, it is characterized in that, also be provided with at least one float on the lateral wall of the first half of described sampling thief.
10. a kind of sampling and pick-up unit for the water volatile organic matter as claimed in claim 9, it is characterized in that, described sampling thief is the cylinder chamber body structure of hollow, a described above float is on the same level cross section of described cylinder chamber body structure, the cross-sectional area of described cylindricality cavity is 1cm2 ~ 1m2, and the height of described sampling thief the latter half is 1/4 ~ 9/10 with the ratio of the height overall of described sampling thief.
11. such as arbitrary described a kind of sampling and pick-up unit for the water volatile organic matter in claim 1-8 or 10, it is characterized in that, described detector also is communicated with described gas purging gas air intake pump, consists of the loop of a closure between described gas access pipeline, sampling thief, gas vent pipeline and the detector.
12. a kind of sampling and pick-up unit for the water volatile organic matter as claimed in claim 11 is characterized in that, described gas purging gas air intake pump is substituted by the air pump that carries in the described detector.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220313875 CN202735137U (en) | 2012-06-29 | 2012-06-29 | Device for sampling and detecting volatile organic compound in water |
| PCT/CN2013/078310 WO2014000685A1 (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 |
| EP13809554.2A EP2833117B1 (en) | 2012-06-29 | 2013-06-28 | Sampling and detection device for volatile organic compound in water |
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| CN 201220313875 CN202735137U (en) | 2012-06-29 | 2012-06-29 | Device for sampling and detecting volatile organic compound in water |
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Cited By (6)
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|---|---|---|---|---|
| CN102721579A (en) * | 2012-06-29 | 2012-10-10 | 华瑞科学仪器(上海)有限公司 | Device for sampling and detecting volatile organic matter in water |
| WO2014000685A1 (en) * | 2012-06-29 | 2014-01-03 | 华瑞科学仪器(上海)有限公司 | Sampling and detection device for volatile organic compound in water |
| CN104280272A (en) * | 2014-10-31 | 2015-01-14 | 贵州大学 | Soil volatile ammonia absorption device with rain cover |
| CN105865859A (en) * | 2016-05-29 | 2016-08-17 | 中国科学院寒区旱区环境与工程研究所 | Gas sampling device applicable to soil at different depths in perennially frozen soil zone |
| CN106501430A (en) * | 2016-10-28 | 2017-03-15 | 湖南大学 | The detection method of the volatile organic matter related to pulmonary carcinoma in a kind of respiratory gass |
| CN108333117A (en) * | 2017-12-26 | 2018-07-27 | 聚光科技(杭州)股份有限公司 | In-situ type gas in pipelines detection device and its working method |
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2012
- 2012-06-29 CN CN 201220313875 patent/CN202735137U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102721579A (en) * | 2012-06-29 | 2012-10-10 | 华瑞科学仪器(上海)有限公司 | Device for sampling and detecting volatile organic matter in water |
| WO2014000685A1 (en) * | 2012-06-29 | 2014-01-03 | 华瑞科学仪器(上海)有限公司 | Sampling and detection device for volatile organic compound in water |
| US9983182B2 (en) | 2012-06-29 | 2018-05-29 | Rae Systems (Shanghai) Inc. | Device for sampling and detecting volatile organic compounds in water |
| CN104280272A (en) * | 2014-10-31 | 2015-01-14 | 贵州大学 | Soil volatile ammonia absorption device with rain cover |
| CN105865859A (en) * | 2016-05-29 | 2016-08-17 | 中国科学院寒区旱区环境与工程研究所 | Gas sampling device applicable to soil at different depths in perennially frozen soil zone |
| CN106501430A (en) * | 2016-10-28 | 2017-03-15 | 湖南大学 | The detection method of the volatile organic matter related to pulmonary carcinoma in a kind of respiratory gass |
| CN108333117A (en) * | 2017-12-26 | 2018-07-27 | 聚光科技(杭州)股份有限公司 | In-situ type gas in pipelines detection device and its working method |
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