CN102620952B - Method for undisturbedly collecting and determining sample of underground water polluted by volatile organic matters - Google Patents
Method for undisturbedly collecting and determining sample of underground water polluted by volatile organic matters Download PDFInfo
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- CN102620952B CN102620952B CN201210090038.3A CN201210090038A CN102620952B CN 102620952 B CN102620952 B CN 102620952B CN 201210090038 A CN201210090038 A CN 201210090038A CN 102620952 B CN102620952 B CN 102620952B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005070 sampling Methods 0.000 claims abstract description 86
- 239000012855 volatile organic compound Substances 0.000 claims abstract description 28
- 238000011010 flushing procedure Methods 0.000 claims abstract description 20
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 3
- 210000002966 serum Anatomy 0.000 claims description 20
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- 239000002349 well water Substances 0.000 claims description 3
- 235000020681 well water Nutrition 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 2
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Abstract
The invention discloses a sampling device for collecting a sample of underground water polluted by volatile organic matters and a method by utilizing the sampling device to undisturbedly collect and determine the sample. The method for collecting and determining the sample of the underground water polluted by the volatile organic matters comprises steps of well flushing, sampling preparation, sampling, storage and transportation, preprocessing and determination. Well flushing is carried out before the sampling, so that distortion of investigation data caused by the reason that rainy water enters the underground water can be avoided, a water sample is manually collected by utilizing a self-made sampling device, the water sample is stored in a 40ml volatile organic compound (VOC) sample bottle being equipped with a polytetrafluoroethylene (PTFE) spacing bottle cover and then is instantaneously stored in a refrigerator, and the water sample is analyzed through a gas chromatograph in a laboratory, so that the pollution situation of the volatile organic matters in the underground water can be accurately known. The method is low in cost and simple in equipment. Data with high authenticity can be acquired by strictly executing the operation according to the disclosed method, an important practical value is realized, and firsthand data can be provided to the site investigation of chlorohydrocarbon polluted field.
Description
Technical field
The present invention relates to investigation and the analytical technology of organic contaminant in the underground environment of place, specifically, relate to a kind of undisturbed collection and assay method of underground water polluted by volatile organic compound sample.
Background technology
Chlorinated solvents, for example trichloroethanes (TCA) and triclene (TCE), be pollutant common in underground water.These solvents start to be widely used in metal degreasing or dry-cleaning very early.To phase late 1970s, because rise and the chemical analysis technology of site investigation develops into the pollutant that ug/L level concentration in water can be detected, in underground water, the pollution level of organic solvent is just found.People impel the standard of potable water to be reduced to the order of magnitude of ug/L to healthy worry, and then have promoted investigation and the reparation of organic contaminant in the underground environment of place.Just repair and must first carry out site investigation place underground water, wherein the monitoring of underground water is exactly a kind of method of site investigation, and in groundwater monitoring, Sampling techniques and sample analysis occupy very important status.
Developed country pays much attention to groundwater sampling technology, and groundwater sampling technology is conducted in-depth research.In recent years, the groundwater contamination of China has also caused the great attention of government, and the method for Groundwater Contamination Investigation is also being studied.China Geological Survey Hydrogeology Environment Geological Survey Center was studied groundwater sampling technology since 2005, and developed a series of ground water fixed depth sampling thiefs, such as air compressor draw water sampling and inertial pump's sampling of drawing water.
Air compressor draws water to sample and refers to when air compressor draws water, in wellhole, be equipped with one and be enclosed within bottom with air-supply pipeline and a set of lifting pipe of air and liquid mixer, using air compressor that air is pressed into ajutage line sprays through air and liquid mixer, in lifting pipe, form countless minute bubbles and generation " gaslift " effect of expanding gradually, the water extraction in well is raised to earth's surface.But air compressor pumping method cannot be used at the more shallow monitor well of the degree of depth.
Inertial pump draws water to sample and refers to that inertial pump consists of the small pipe line that bottom valve is housed, and during decline, bottom valve is opened, and valve closing during rising, by swinging up and down the liter waterborne making in pipeline, is discharged into earth's surface.Inertial pump be in all underground water sampling pumps, the most easily use and cost minimum.The degree of depth in 30 m, inertial pump can manually use.Inertial pump is relatively applicable to the monitor well of minor diameter.But, when inertial pump draws water, due to shake up and down, sample is produced to disturbance, so be not suitable for gathering the underground water sample that contains volatile organic matter.
And in water sample aspect the analysis of volatile organic matter, at present the most frequently used is to analyze with gas chromatograph.But carry out the analysis of sample at chromatography of gases before, need to carry out pre-treatment to sample.Pre-treating method has: liquid-liquid extraction method, Static Headspace method, solid absorption analytical method and Puffing and trapping.Wherein Puffing and trapping, bioaccumulation efficiency advantages of higher few with its sampling amount, is all subject to the attention of environment circle for a long time.
Summary of the invention
The object of the invention is to for existing volatile organic matter technology, a kind of underground water polluted by volatile organic compound sample sampling thief is provided.
Second object of the present invention, provides water sampling and the analytical approach of underground water polluted by volatile organic compound, utilizes the sampling thief of speciality, can realize the sample that undisturbed gathers underground water polluted by volatile organic compound, and sample is analyzed accurately.
For realizing first object of the present invention, the invention discloses a kind of underground water polluted by volatile organic compound sample collector, comprise body, pipe end mouth and bale handle, pipe end mouth is positioned at body lower end, diameter is less than body, in pipe end mouth, a movable ball valve is set, pipe end mouth top arranges a tripod baffle plate, and bale handle is positioned at body upper end, it is characterized in that, body upper end arranges a serum cap, in the middle of described serum cap, an aperture is set, the inside radius of serum cap and body external radius equal and opposite in direction, serum cap inside surface is coated with poly tetrafluoroethylene.
As a preferred version, described body length is 0.37 m, and diameter is 0.04 m, and tripod baffle plate is 0.06 m apart from the distance of pipe Di Kou bottom, and end nozzle diameter is 0.018 m, and ball valve diameter is 0.015 m.
When entering water, ball valve is opened, and water enters in pipe, and tripod baffle plate is in order to control the position of ball valve; When upper carrying, ball valve is closed, and water sample rests in pipe, and in well, water sample is removed.The serum cap on body top is in order to prevent the volatilization of volatile organic matter in water sample.Meanwhile, the appropriate length of sampling thief can prevent the disturbance of body to underground water, can not collect the sedimentary particle of bottom.
For realizing second object of the present invention, the technical scheme that the present invention takes is: a kind of undisturbed collection and assay method of underground water polluted by volatile organic compound sample, it is characterized in that, and comprise the following steps:
(1) well-flushing, pays close attention to weather condition before well-flushing, within 3 days, there is no the weather of precipitation after first 3 days of well-flushing of selection and well-flushing; Each sampled well is prepared disposable Beile's pipe, and sample collector prepares protective clothing, respirator and emgloves; Use Beile to manage the water in reciprocal stirring well, to cleaning the earth of shaft bottom alluvial, when the water extracting is 3-5 times of WIH volume, pH value, DO and the conductivity value of WIH are stable, at this moment think well-flushing success;
(2) before sampling, prepare, 24 h samplings after well-flushing, during this period of time in WIH position and current reach balance, can truly reflect this sampled point underground water present situation; Before sampling, prepare sampling bottle, each well location is furnished with the VOC bottle of 2 40 mL as sampling bottle, and the some position information that will sample writes on the label of sampling bottle, these sampling bottles are placed in the insulation can that ice bag is housed, sample collector prepares protective clothing, respirator and emgloves;
(3) sampling, utilize above-mentioned collector collected specimens, with cord, tie up on the bale handle of sampling thief, from the aperture of serum cap, pass, sampling thief is hung in well, until water does not have the upper end of over-sampling device, this process is slow especially, prevent excessive velocities stirring well water, cause the mud in shaft bottom to be rushed in sampling thief, the water of getting is up put at leisure in the VOC bottle of 40 mL, bottle reduces current while expiring soon, to reduce the bubble producing in water flow process, the bottle of having sampled is put in insulation can and is preserved, transport laboratory back;
(4) pre-treatment and mensuration, the pollution determination in sampling of ground water adopts purge and trap coupling gas chromatography to measure.
VOC bottle described in step (2) is furnished with teflon pad bottle cap; In described VOC bottle, drip the 0.1 mL1:1 concentrated sulphuric acid.
Sample in sampling bottle described in step (3) is to preserve without bubble.
The pre-treating method of underground water sample in step (4), purge and trap parameter is set to: trap tube model: OI-10#; U-shaped pipe: 5 mL; Gas flow: 40 mL/min; Initial trapping temperature: according to environment temperature; Desorption temperature: 180 ℃; Baking temperature: 210 ℃; Purge time: 11 min; Desorption time: 4 min; Valve temperature: 110 ℃; Transmission line temperature: 110 ℃; Baking time: 2 min; The washing times of sample room: 2 times.
In step (4), gas chromatography instrument parameter arranges: Agilent 7890A gas chromatography; Agilent chem workstation; Capillary chromatographic column: DB-VRX 60 mm * 1.4, m * 0.25 μ m; Sample introduction temperature: 240 ℃; Helium column flow velocity: 2 mL/min; Initial temperature: 45 ℃, keep 0 min; Heating schedule: 12 ℃/min rises to 190 ℃, keeps 2 min; Working time: 12.3 min; Split ratio: 20:1; Stop running temperature: 235 ℃, keep 0 min; Transmission line temperature: 230 ℃.
Volatile organic matter described in the present invention mainly refers to chlorinated hydrocarbon organic contaminant.
Beneficial effect of the present invention is: (1) is used self-control sampling thief to carry out the artificial sampling of extracting, and the advantage of this sampling thief is for not being subject to the restriction of the monitor well degree of depth and diameter, easy to use.The size of this sampling thief is little, prevents from causing sedimental disturbance in well because of oversize, affects follow-up determination experiment, is specially adapted to the underground water well sampling that the degree of depth is less, water level is lower.The serum cap that the inside surface adding on top is coated with Teflon can effectively prevent the loss of volatile organic matter in water sample, and middle aperture can make again intraductal atmospheric pressure and atmospheric pressure communicate, and water sample can be entered in VOC sample bottle smoothly.This sampling thief is made simple, and low price, is convenient to practical operation.
(2) use purge and trap to coordinate gas chromatograph to carry out the analysis of volatile organic matter, can realize the detection of the pollutant of low concentration, and accuracy is high.
(3) the undisturbed collection of VOC monitoring organic compounds investigation in a kind of underground water and the method for pollutant Accurate Determining are disclosed, the whole series method has that cost is low, the simple advantage of equipment, in strict accordance with a whole set of method operation disclosed by the invention, can obtain the data that authenticity is higher, there is important practical value, can provide the firsthand information for the site investigation of chlorohydrocarbon contaminated site.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of sampling thief, wherein, and 1-Guan Dikou; 2-ball valve; 3-tripod baffle plate; 4-body; 5-bale handle; 6-serum cap; 7-aperture.
Fig. 2 is the process flow diagram of sampling and mensuration.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.The experimental technique using in following embodiment if no special instructions, is conventional method.In following embodiment, material used, reagent etc., if no special instructions, all can obtain from commercial channels.Should be understood that these embodiment are only not used in and limit the scope of the invention for the present invention is described.
Teflon FEP(fluorinated vinyl propylene of sampling thief body material) make.As shown in Figure 1, comprise body 4, pipe end mouth 1 and bale handle 5, pipe end mouth 1 is positioned at body 4 lower ends, pipe end mouth 1 diameter is less than body 4 diameters, the pipe end mouth 1 interior movable ball valve 2 that arranges, pipe mouth 1 top, the end arranges a tripod baffle plate 3, bale handle 5 is positioned at body 4 upper ends, it is characterized in that, body 4 upper ends arrange a serum cap 6, and the aperture 7 of Radius approximately 0.0025 m is set in the middle of described serum cap 6, the inside radius of serum cap 6 and body 4 external radius equal and opposite in directions, serum cap 6 inside surfaces are coated with Teflon(teflon) film.
Described body 4 length are 0.37 m, and diameter is 0.04 m, and tripod baffle plate 3 is 0.06 m apart from the distance of pipe end mouth 1, and bottom tube mouth 1 diameter is 0.018 m, and ball valve 2 diameters are 0.015 m.Long 0.37 m of sampling thief, diameter 0.04 m, above bale handle, add that a centre is with the serum cap 6 of radius approximately 0.0025 m aperture 7, the external radius of the inside radius of serum cap 6 and body 4 equates, height is 0.05 m, tripod baffle plate 3 is 0.06m apart from the distance of pipe end mouth 1, and bottom tube mouth 1 diameter is 0.018m, and ball valve 2 diameters are 0.015 m.When entering water, ball valve 2 is opened, and water enters in pipe, and tripod baffle plate 3 is in order to control the position of ball valve 2; When upper carrying, ball valve 2 is closed, and water sample rests in pipe, and in well, water sample is removed.The serum cap 6 on body 4 tops is in order to prevent the volatilization of volatile organic matter in water sample.Meanwhile, the appropriate length of sampling thief can prevent the disturbance of 4 pairs of underground water of body, can not collect the sedimentary particle of bottom.
Collection and the analysis of embodiment 2, Dp-01 monitor well sample
Monitor well: the Dp-01 monitor well in the factory area of PVG.
Sample mode: suction in sampling thief well.
Sample bottle: 40 mL Brown Glass Brown glass bottles and jars onlys, are used teflon gasket in cap.
Store means of transportation: be put in Refrigerated Transport in the insulation can of several ice bags.
Analytical approach: purge and trap---gas chromatograph.
Sampling and the concrete steps of measuring are as follows:
(1) well-flushing, pays close attention to weather condition before well-flushing, within 3 days, there is no the weather of precipitation after first 3 days of well-flushing of selection and well-flushing; Each sampled well is prepared a disposable Teflon FEP Beile pipe, and sample collector prepares protective clothing, respirator and emgloves; Use Beile to manage the water in reciprocal stirring well, to cleaning the earth of shaft bottom alluvial, when the water extracting is 3～5 times of WIH volume, the pH value of WIH, DO(dissolved oxygen DO) and conductivity value stable, at this moment think that well-flushing is successful;
(2) before sampling, prepare, sampling in 24 hours after well-flushing, during this period of time in WIH position and current reach balance, can truly reflect this sampled point underground water present situation; Before sampling, prepare sampling bottle, each well location is furnished with the VOC(volatile organic matter of 2 40 mL) bottle is as sampling bottle, and the some position information that will sample writes on the label of sampling bottle, these sampling bottles are placed in the insulation can that ice bag is housed, sample collector prepares protective clothing, respirator and emgloves;
(3) sampling, ties up to cord on the bale handle of sampling thief, from the aperture of serum cap, passes, sampling thief is hung in well, until water does not have the upper end of over-sampling device, this process is slow especially, prevent excessive velocities stirring well water, cause the mud in shaft bottom to be rushed in sampling thief; The water of getting is up put at leisure in the VOC bottle of 40 mL, bottle reduces current while expiring soon, to reduce the bubble producing in water flow process.The bottle of having sampled is put in insulation can and is preserved, transport laboratory back;
(4) pre-treatment and mensuration, the pollution determination in sampling of ground water adopts purge and trap coupling gas chromatography to measure.
The pre-treating method of underground water sample in step (4), purge and trap parameter is set to: trap tube model: OI-10#; U-shaped pipe: 5 mL; Gas flow: 40 mL/min; Initial trapping temperature: according to environment temperature; Desorption temperature: 180 ℃; Baking temperature: 210 ℃; Purge time: 11 min; Desorption time: 4 min; Valve temperature: 110 ℃; Transmission line temperature: 110 ℃; Baking time: 2 min; The washing times of sample room: 2 times.
In step (4), gas chromatography instrument parameter arranges: Agilent 7890A gas chromatography; Agilent chem workstation; Capillary chromatographic column: DB-VRX 60 mm * 1.4, m * 0.25 μ m; Sample introduction temperature: 240 ℃; Helium column flow velocity: 2 mL/min; Initial temperature: 45 ℃, keep 0 min; Heating schedule: 12 ℃/min rises to 190 ℃, keeps 2 min; Working time: 12.3 min; Split ratio: 20:1; Stop running temperature: 235 ℃, keep 0 min; Transmission line temperature: 230 ℃.
Analysis result: VC:968 ug/L, CA:104000 ug/L, DCE:5590 ug/L, DCA:272000 ug/L, TCA:548000 ug/L.
Collection and the analysis of embodiment 3, Dp-03 monitor well sample
Monitor well: the DP-03 monitor well in the factory area of PVG.
Sample mode: suction in sampling thief well.
Sample bottle: 40 mL Brown Glass Brown glass bottles and jars onlys, are used teflon gasket in cap.
Store means of transportation: be put in Refrigerated Transport in the insulation can of several ice bags.
Analytical approach: purge and trap---gas chromatograph.
The concrete steps of sampling and mensuration are with embodiment 2.
Analysis result: VC:670 ug/L, CA:50300 ug/L, DCE:3090 ug/L, DCA:293000 ug/L, TCA:354000 ug/L.
Collection and the analysis of embodiment 4, DP-16 monitor well sample
Monitor well: the DP-16 monitor well in the factory area of PVG.
Sample mode: suction in sampling thief well.
Sample bottle: 40 mL Brown Glass Brown glass bottles and jars onlys, are used teflon gasket in cap.
Store means of transportation: be put in Refrigerated Transport in the insulation can of several ice bags.
Analytical approach: purge and trap-gas chromatograph.
The concrete steps of sampling and mensuration are with embodiment 2.
Analysis result: VC:321 ug/L, CA:130000 ug/L, DCE:1690 ug/L, DCA:107000 ug/L, TCA:440000 ug/L.
Collection and the analysis of embodiment 5, MW-201 monitor well sample
Monitor well: the MW-201 monitor well in the factory area of PVG.
Sample mode: suction in sampling thief well.
Sample bottle: 40 mL Brown Glass Brown glass bottles and jars onlys, are used teflon gasket in cap.
Store means of transportation: be put in Refrigerated Transport in the insulation can of several ice bags.
Analytical approach: purge and trap---gas chromatograph.
The concrete steps of sampling and mensuration are with embodiment 2.
Analysis result: VC:50 ug/L, CA:43500 ug/L, DCE:105 ug/L, DCA:4460 ug/L, TCA:2320 ug/L.
Collection and the analysis of embodiment 6, MW-210 monitor well sample
Monitor well: the MW-210 monitor well in the factory area of PVG.
Sample mode: suction in sampling thief well.
Sample bottle: 40 mL Brown Glass Brown glass bottles and jars onlys, are used teflon gasket in cap.
Store means of transportation: be put in Refrigerated Transport in the insulation can of several ice bags.
Analytical approach: purge and trap---gas chromatograph.
The concrete steps of sampling and mensuration are with embodiment 2.
Analysis result: VC:579 ug/L, CA:82700 ug/L, DCE:4680 ug/L, DCA:206000 ug/L, TCA:971000 ug/L.
Collection and the analysis of embodiment 7, MW-26-4 monitor well sample
Monitor well: the MW-26-4 monitor well in the factory area of PVG.
Sample mode: suction in sampling thief well.
Sample bottle: 40 mL Brown Glass Brown glass bottles and jars onlys, are used teflon gasket in cap.
Store means of transportation: be put in Refrigerated Transport in the insulation can of several ice bags.
Analytical approach: purge and trap---gas chromatograph.
The concrete steps of sampling and mensuration are with embodiment 2.
Analysis result: VC:154 ug/L, CA:7780 ug/L, DCE:741 ug/L, DCA:35600 ug/L, TCA:96200 ug/L.
Collection and the analysis of embodiment 8, MW-27 monitor well sample
Monitor well: the MW-27 monitor well in the factory area of PVG.
Sample mode: suction in sampling thief well.
Sample bottle: 40 mL Brown Glass Brown glass bottles and jars onlys, are used teflon gasket in cap.
Store means of transportation: be put in Refrigerated Transport in the insulation can of several ice bags.
Analytical approach: purge and trap---gas chromatograph.
The concrete steps of sampling and mensuration are with embodiment 2.
Analysis result: VC:50 ug/L, CA:5560 ug/L, DCE:50 ug/L, DCA:12500 ug/L, TCA:1880 ug/L.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. undisturbed collection and the assay method of underground water polluted by volatile organic compound sample, is characterized in that, comprises the following steps:
(1) well-flushing, pays close attention to weather condition before well-flushing, within 3 days, there is no the weather of precipitation after first 3 days of well-flushing of selection and well-flushing; Each sampled well is prepared disposable Beile's pipe, and sample collector prepares protective clothing, respirator and emgloves; Use Beile to manage the water in reciprocal stirring well, to cleaning the earth of shaft bottom alluvial, when the water extracting is 3-5 times of WIH volume, pH value, DO and the conductivity value of WIH are stable, at this moment think well-flushing success;
(2) before sampling, prepare, 24 h samplings after well-flushing, during this period of time in WIH position and current reach balance, can truly reflect sampled point underground water present situation; Before sampling, prepare sampling bottle, each well location is furnished with the VOC bottle of 2 40 mL as sampling bottle, and the some position information that will sample writes on the label of sampling bottle, these sampling bottles are placed in the insulation can that ice bag is housed, sample collector prepares protective clothing, respirator and emgloves;
(3) sampling, utilize collector collected specimens, described collector comprises body, pipe end mouth and bale handle, pipe end mouth is positioned at body lower end, diameter is less than body, in pipe end mouth, a movable ball valve is set, pipe end mouth top arranges a tripod baffle plate, bale handle is positioned at body upper end, body upper end arranges a serum cap, one aperture is set in the middle of described serum cap, the inside radius of serum cap and body external radius equal and opposite in direction, serum cap inside surface is coated with poly tetrafluoroethylene, with cord, tie up on the bale handle of sampling thief, from the aperture of serum cap, pass, sampling thief is hung in well, until water does not have the upper end of over-sampling device, this process is slow especially, prevent excessive velocities stirring well water, cause the mud in shaft bottom to be rushed in sampling thief, the water of getting is up put at leisure in the VOC bottle of 40 mL, bottle reduces current while expiring soon, to reduce the bubble producing in water flow process, the bottle of having sampled is put in insulation can and is preserved, transport laboratory back,
(4) pre-treatment and mensuration, the pollution determination in sampling of ground water adopts purge and trap coupling gas chromatograph to measure.
2. undisturbed collection and the assay method of a kind of underground water polluted by volatile organic compound sample according to claim 1, is characterized in that, the VOC bottle described in step (2) is furnished with teflon pad bottle cap.
3. undisturbed collection and the assay method of a kind of underground water polluted by volatile organic compound sample according to claim 1, is characterized in that, drips the 0.1 mL1:1 concentrated sulphuric acid described in step (2) in VOC bottle.
4. undisturbed collection and the assay method of a kind of underground water polluted by volatile organic compound sample according to claim 1, is characterized in that, the sample in the sampling bottle described in step (3) is to preserve without bubble.
5. undisturbed collection and the assay method of a kind of underground water polluted by volatile organic compound sample according to claim 1, is characterized in that, the pre-treating method of underground water sample in step (4), and purge and trap parameter is set to: trap tube model: OI-10#; U-shaped pipe: 5 mL; Gas flow: 40 mL/min; Initial trapping temperature: according to environment temperature; Desorption temperature: 180 ℃; Baking temperature: 210 ℃; Purge time: 11 min; Desorption time: 4 min; Valve temperature: 110 ℃; Transmission line temperature: 110 ℃; Baking time: 2 min; The washing times of sample room: 2 times.
6. undisturbed collection and the assay method of a kind of underground water polluted by volatile organic compound sample according to claim 1, is characterized in that, in step (4), gas chromatography instrument parameter arranges: Agilent 7890A gas chromatography; Agilent chem workstation; Capillary chromatographic column: DB-VRX 60 mm * 1.4, m * 0.25 μ m; Sample introduction temperature: 240 ℃; Helium column flow velocity: 2 mL/min; Initial temperature: 45 ℃, keep 0 min; Heating schedule: 12 ℃/min rises to 190 ℃, keeps 2 min; Working time: 12.3 min; Split ratio: 20:1; Stop running temperature: 235 ℃, keep 0 min; Transmission line temperature: 230 ℃.
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| CN109828041A (en) * | 2019-01-25 | 2019-05-31 | 北京建工环境修复股份有限公司 | The measuring method of volatile organic matter total amount in a kind of underground water |
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| AU2013286767B2 (en) * | 2012-07-03 | 2017-07-13 | Chevron U.S.A. Inc | Detection of hydrocarbons in aqueous environments |
| CN107064444A (en) * | 2017-02-28 | 2017-08-18 | 江苏和顺环保有限公司 | Underground water automatic sampling system and its method for sampling |
| CN110221013A (en) * | 2019-07-04 | 2019-09-10 | 河北省地质环境监测院 | Simple, Practical Determination Method of VOCs in underground water |
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| CN86206798U (en) * | 1986-09-03 | 1987-08-05 | 周望祖 | Universal automatic water sampler |
| CN2173955Y (en) * | 1992-09-10 | 1994-08-10 | 邹涛录 | Liquid sampler |
| CN2856965Y (en) * | 2005-12-12 | 2007-01-10 | 中华人民共和国蛇口出入境检验检疫局 | Fixed-point liquid sampler |
| CN101696915B (en) * | 2009-10-15 | 2011-04-20 | 中国地质科学院水文地质环境地质研究所 | Device for manually and quickly collecting groundwater samples in well-less soft soil layer areas |
| KR101168046B1 (en) * | 2010-08-09 | 2012-07-24 | 한국지질자원연구원 | Apparatus and method for groundwater sampling using hydraulic coupler |
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