CN115343403A - Detection device for benzene series in underground water of typical pesticide pollution site - Google Patents
Detection device for benzene series in underground water of typical pesticide pollution site Download PDFInfo
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- CN115343403A CN115343403A CN202210979880.6A CN202210979880A CN115343403A CN 115343403 A CN115343403 A CN 115343403A CN 202210979880 A CN202210979880 A CN 202210979880A CN 115343403 A CN115343403 A CN 115343403A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 238000001514 detection method Methods 0.000 title claims abstract description 36
- 239000000575 pesticide Substances 0.000 title claims abstract description 16
- 125000001997 phenyl group Chemical class [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 title claims 12
- 239000007788 liquid Substances 0.000 claims abstract description 30
- 239000003673 groundwater Substances 0.000 claims abstract description 28
- 238000001914 filtration Methods 0.000 claims abstract description 17
- 239000002689 soil Substances 0.000 claims abstract description 17
- 238000000967 suction filtration Methods 0.000 claims abstract description 12
- 239000012159 carrier gas Substances 0.000 claims description 47
- 238000010926 purge Methods 0.000 claims description 31
- 238000004817 gas chromatography Methods 0.000 claims description 17
- 238000000926 separation method Methods 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 12
- 238000011084 recovery Methods 0.000 claims description 12
- 238000007790 scraping Methods 0.000 claims description 12
- 238000009833 condensation Methods 0.000 claims description 10
- 230000005494 condensation Effects 0.000 claims description 9
- 230000001681 protective effect Effects 0.000 claims description 8
- 238000005057 refrigeration Methods 0.000 claims description 7
- 230000000712 assembly Effects 0.000 claims description 6
- 238000000429 assembly Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000005485 electric heating Methods 0.000 claims description 5
- 238000001556 precipitation Methods 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 4
- 239000006228 supernatant Substances 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims 1
- 150000001555 benzenes Chemical class 0.000 abstract description 39
- VEFXTGTZJOWDOF-UHFFFAOYSA-N benzene;hydrate Chemical class O.C1=CC=CC=C1 VEFXTGTZJOWDOF-UHFFFAOYSA-N 0.000 abstract description 4
- 230000002349 favourable effect Effects 0.000 abstract description 3
- 230000001737 promoting effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
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- 238000002290 gas chromatography-mass spectrometry Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000001926 trapping method Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000865 membrane-inlet mass spectrometry Methods 0.000 description 1
- 210000005036 nerve Anatomy 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
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- 210000004994 reproductive system Anatomy 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000002470 solid-phase micro-extraction Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
- G01N30/12—Preparation by evaporation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
- G01N30/12—Preparation by evaporation
- G01N2030/121—Preparation by evaporation cooling; cold traps
- G01N2030/122—Preparation by evaporation cooling; cold traps cryogenic focusing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
- G01N30/12—Preparation by evaporation
- G01N2030/125—Preparation by evaporation pyrolising
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
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Abstract
The invention relates to the technical field of underground water benzene series detection, and discloses a detection device for underground water benzene series in a typical pesticide pollution site, which comprises an acquisition device for acquiring underground water, a detection device connected with the acquisition device and used for detecting the benzene series, and a filtering device arranged between the acquisition device and the detection device; the collecting device comprises a groundwater collecting rod for entering soil, a liquid collecting port arranged at the lower end of the groundwater collecting rod, a suction filtration pipe arranged at the upper end of the groundwater collecting rod and communicated with a filtering device, and a collecting communicating pipe arranged at the center of the groundwater collecting rod and communicated with the suction filtration pipe and the liquid collecting port; this device can effectually separate the benzene series thing of groundwater to can carry out the efficient entrapment to the benzene series thing of isolating, be favorable to promoting the detection precision to the benzene series thing of groundwater.
Description
Technical Field
The invention relates to the technical field of detection of underground water benzene series, in particular to a detection device for the underground water benzene series in a typical pesticide pollution site.
Background
The benzene series can be widely detected in human living and living environments due to pollution in production and life. And has strong harm to blood, nerve and reproductive system of human body. Developed countries have generally taken the concentration of benzene series in the atmosphere as one of the contents of routine monitoring of atmospheric environment, and have stipulated strict indoor and outdoor air quality standards. The sampling method of the benzene series can be divided into a container trapping method, a solid phase adsorption method/a solvent elution method, a solid phase microextraction method, a solid phase adsorption method, a thermal desorption method and a low-temperature sampling method. The container trapping method has the advantages that an adsorbent is not used, so that penetration, decomposition and desorption during the use of the adsorbent can be avoided, and the same sample component can be analyzed for many times.
The benzene series can be determined by Gas Chromatography (GC), gas chromatography/mass spectrometry (GC/MS) fluorescence spectrophotometry, and membrane introduction mass spectrometry. Of which gas chromatography, gas chromatography/mass spectrometry are most commonly used. The gas chromatography-mass spectrometry combined method has high separation capability and accurate qualitative identification capability, can preliminarily detect chromatographic peaks which are not separated, has high sensitivity and reliability, becomes a basic analysis method for measuring substance detection, and is widely applied to the field of environmental monitoring.
Different from the detection of benzene series in the air, the prior art can not effectively separate the benzene series in the underground water when detecting the benzene series in the underground water, so that the benzene series in the underground water can not be accurately detected.
Disclosure of Invention
The invention solves the technical problems that: the prior art can not separate all benzene series in the underground water, and the efficiency of collecting the separated benzene series is not high, so that the prior art is not beneficial to the accurate detection of the benzene series.
The technical scheme of the invention is as follows: a detection device for benzene series in underground water of a typical pesticide pollution site comprises an acquisition device for acquiring underground water, a detection device connected with the acquisition device and used for detecting the benzene series, and a filtering device arranged between the acquisition device and the detection device;
the collecting device comprises a groundwater collecting rod for entering soil, a liquid collecting port arranged at the lower end of the groundwater collecting rod, a suction filtration pipe arranged at the upper end of the groundwater collecting rod and communicated with a filtering device, and a collecting communicating pipe arranged at the center of the groundwater collecting rod and communicated with the suction filtration pipe and the liquid collecting port;
the detection device comprises a protection box body, a gas chromatography detector arranged on the protection box body and used for detecting the benzene series, and a vertical convection purging device arranged in the protection box body;
the vertical convection purging device comprises a circulation overflow system communicated with a filtering device, a carrier gas purging system communicated with the circulation overflow system, and a trapping system communicated with the carrier gas purging system and the gas chromatography detector;
the circulating overflow system comprises a main overflow box body horizontally arranged in the protective box body, a water inlet drain pipe communicated with the bottom of the main overflow box body and the filtering device, a recovery box body horizontally arranged right below the main overflow box body, and a convection purging communicating device vertically arranged on the side surfaces of the main overflow box body and the recovery box body;
the recycling box body is provided with a circulating negative pressure pump communicated with the main overflow box body;
two sides of the main overflow box body close to the upper part are provided with strip-shaped overflow notches;
the convection purging communicating vessel comprises a vertical flat channel and a drainage plate, wherein the upper end of the vertical flat channel is communicated with the strip-shaped overflow notch, the lower end of the vertical flat channel is communicated with the recovery box body, and the drainage plate is arranged in the vertical flat channel; the drainage plate is close to one side of the strip-shaped overflow notch;
the carrier gas purging system comprises a gas inlet assembly arranged at the lower end of the side face of the vertical flat channel, a gas outlet assembly arranged at the upper end of the side face of the vertical flat channel and a carrier gas supply device communicated with the gas inlet assembly;
the air inlet assembly and the air outlet assembly are communicated with the vertical flat channel and far away from one side of the strip-shaped overflow notch.
Furthermore, the air inlet assembly comprises a bar-shaped air inlet which is arranged on the side surface of the vertical flat channel and is horizontally arranged, a carrier gas guide plate which is arranged in the bar-shaped air inlet and is obliquely arranged, and an electric heating assembly which is arranged in the bar-shaped air inlet;
the carrier gas guide plate can enable the carrier gas to flow upwards in the vertical flat channel and on the side far away from the drainage plate.
Description of the drawings: the carrier gas guide plate is obliquely arranged in the vertical flat channel, so that the carrier gas flows upwards along the outer side of the vertical flat channel, and the underground water overflowing from the strip-shaped overflow groove flows downwards along the inner side of the vertical flat channel, so that the air flow formed by the carrier gas can perform convection purging on the underground water; through convection purging, a large amount of benzene series can be transferred to the carrier gas, separation of underground water and the benzene series is achieved, and next-step pyrolysis and detection are facilitated.
Further, the air outlet assembly comprises a strip-shaped air outlet and a carrier gas communicating pipe which is communicated with the strip-shaped air outlet and the trapping system; the strip-shaped air outlet is communicated with the vertical flat channel in a sealing way through a separation channel extending horizontally; the separation channel is located above the vertical flat channel.
Description of the invention: the separation channel extends horizontally, and when the underground water carried by the carrier gas moves upwards, the underground water and the separation channel form impact due to the horizontally arranged separation channel, and then fall back into the vertical flat channel under the action of gravity; the carrier gas flow enters the condensing tube through the strip-shaped air outlet of the separation channel; the underground water and the carrier gas can be effectively separated through the separation channel, and the adverse effect on the detection of the benzene series objects caused by the fact that a large amount of underground water enters the condensation pipe is avoided.
Furthermore, the trapping system comprises two groups of condensing pipes which are respectively communicated with the gas outlet assembly, a pyrolyzer which is arranged in the middle of each condensing pipe and is communicated with the two groups of condensing pipes, two groups of refrigerating assemblies which are respectively sleeved outside the condensing pipes, and a temperature regulator which is communicated with the refrigerating assemblies;
the pyrolyzer can heat the liquid in the condenser tube to form vapor and is communicated with the gas chromatography detector.
Description of the drawings: the carrier gas communicating pipe leads the carrier gas carrying the benzene series into the condensing pipe, the temperature regulator carries out refrigeration to condense the benzene series in the condensing pipe into liquid, and the liquid benzene series enters the pyrolyzer along with the flowing of the liquid benzene series; then detecting the gaseous benzene series formed in the pyrolyzer by using a gas chromatography detector; the carrier gas supplied by the carrier gas supply device is inert gas such as helium, argon and the like.
Furthermore, the lengths of the vertical flat channel, the strip-shaped air outlet, the strip-shaped air inlet and the strip-shaped overflow notch are all consistent.
Description of the drawings: the length of the vertical flat channel is consistent with that of the strip-shaped overflow groove, the strip-shaped air outlet and the strip-shaped air inlet, so that the maximum blowing area can be formed during vertical convection blowing, and the benzene series is favorably and fully transferred.
Further, the underground water collecting rod comprises a plurality of cylindrical splicing rods connected by threaded connectors; the side wall of the cylindrical splicing rod is uniformly provided with rib grooves extending along the axis direction.
Description of the drawings: through threaded connection's setting can make cylinder concatenation pole realize swing joint, be convenient for through the length that increases the whole groundwater acquisition pole of number extension of cylinder concatenation pole, realize gathering the groundwater of the different degree of depth.
Further, the liquid collecting port comprises a plurality of liquid inlet holes which are uniformly arranged on the splicing rod at the lowest end; the liquid inlet holes are all provided with intercepting filter screens for blocking soil particles;
and a soil breaker is arranged under the cylindrical splicing rod.
Description of the drawings: when workers insert the underground water collecting rod into soil, the soil breaker is beneficial to enabling the underground water collecting rod to move downwards and damage the soil at the front end; the setting of interception filter screen then can avoid big soil particle to get into the inlet liquid downthehole, and blocks up groundwater and gather the pole.
Furthermore, an anti-blocking component is sleeved on the lower end of the cylindrical splicing rod;
the anti-blocking assembly comprises a mud scraping sleeve movably sleeved at a liquid inlet of the side wall of the cylindrical splicing rod, a spring element, a connecting lug and a pull wire, wherein the spring element is sleeved on the side wall of the cylindrical splicing rod, the upper end of the spring element is fixed, and the lower end of the spring element is connected with the mud scraping sleeve;
the pull wire can extend to the ground, and the pull wire can pull the mud scraping sleeve upwards to compress the spring element and enable the liquid inlet hole to leak out.
Description of the drawings: the setting of anti-blocking device can strike off the soil on the interception filter screen, avoids the interception filter screen to block up, is favorable to improving the collection efficiency to groundwater.
Further, filter equipment include with the sediment filter chamber of suction filtration pipe intercommunication sets up the water pump of sediment filter chamber lower extreme and suction filtration union coupling department sets up the filter assembly of sediment filter chamber upper end sets up the filter assembly upper end and the supernatant aqua storage tank with the calandria intercommunication of intaking.
Description of the invention: the filter equipment can precipitate and filter the collected underground water again, effectively removes large solid particles in the underground water, and is favorable for avoiding the damage of the solid particles to the collection device.
The invention has the beneficial effects that: the invention provides a detection device for benzene series in underground water in a typical pesticide pollution site, which can enable the underground water to circularly flow through a circulating overflow device, the underground water enters a vertical convection purging device through strip-shaped overflow notches on two sides, and the benzene series in the underground water is completely transferred into carrier gas in a vertical convection purging mode while the underground water circularly overflows.
Collecting benzene series in the carrier gas by a collecting system, and sending the collected benzene series into a gas chromatography detector for detecting the benzene series; the vertical convection purging device and the circulating overflow device provided by the device can effectively transfer benzene series in the underground water to the carrier gas; the trapping system that this device provided can carry out the efficient entrapment to the benzene series thing in the carrier gas to ensure that the gas chromatography detector can carry out effective accurate detection to the benzene series thing of groundwater.
Drawings
FIG. 1 is a schematic view of the overall structure of embodiment 1 of the present invention;
FIG. 2 is a schematic structural diagram of an acquisition device according to embodiment 1 of the present invention;
FIG. 3 is a schematic structural view of a vertical convection purging device according to embodiment 1 of the present invention;
FIG. 4 is a schematic structural diagram of a circulating overflow system and a carrier gas purging system in embodiment 1 of the present invention;
FIG. 5 is a schematic view of the configuration of an trapping system according to example 1 of the present invention;
FIG. 6 is a schematic structural view of a groundwater collecting pole according to embodiment 2 of the present invention;
FIG. 7 is a schematic structural view of a ground breaker according to embodiment 2 of the present invention;
FIG. 8 is a schematic structural view of an anti-clogging assembly according to embodiment 3 of the present invention;
wherein, 1-collection device, 10-underground water collection rod, 100-cylindrical splicing rod, 101-threaded connection piece, 102-rib groove, 11-liquid collection port, 110-liquid inlet hole, 111-intercepting filter screen, 12-suction filter pipe, 13-collection communicating pipe, 14-soil breaker, 15-anti-blocking component, 150-mud scraping sleeve, 151-spring element, 152-connecting lug, 153-pull wire, 2-detection device, 20-protection box, 21-gas chromatography detector, 3-filtration device, 30-precipitation filter chamber, 31-water pump, 32-filtration component, 33-supernatant water storage tank, 4-vertical convection purging device, 5-circulation overflow system 50-main overflow box body, 51-water inlet calandria, 52-recovery box body, 53-convection purging communicating device, 54-circulation negative pressure pump, 500-strip-shaped overflow notch, 530-vertical flat channel, 531-drainage plate, 6-carrier gas purging system, 60-air inlet component, 61-air outlet component, 62-carrier gas supply device, 600-strip-shaped air inlet, 601-carrier gas guide plate, 602-electric heating component, 610-strip-shaped air outlet, 611-carrier gas communicating pipe, 612-separation channel, 7-trapping system, 70-condensation pipe, 71-pyrolyzer, 72-temperature regulator and 73-refrigeration component.
Detailed Description
Example 1:
the detection device for the benzene series in the groundwater of the typical pesticide pollution site as shown in fig. 1 comprises a collection device 1 for collecting groundwater, a detection device 2 connected with the collection device 1 and used for detecting the benzene series, and a filtering device 3 arranged between the collection device 1 and the detection device 2;
As shown in fig. 2, the collecting device 1 includes a groundwater collecting rod 10 for entering soil, a fluid collecting port 11 disposed at a lower end of the groundwater collecting rod 10, a suction filtration pipe 12 disposed at an upper end of the groundwater collecting rod 10 and communicated with the filtering device 3, and a collecting communicating pipe 13 disposed at a center of the groundwater collecting rod 10 and communicated with the suction filtration pipe 12 and the fluid collecting port 11;
the detection device 2 comprises a protective box body 20, a gas chromatography detector 21 arranged on the protective box body 20 and used for detecting benzene series, and a vertical convection purging device 4 arranged in the protective box body 20;
as shown in fig. 3, the vertical convection purging device 4 comprises a circulation overflow system 5 communicated with the filtering device 3, a carrier gas purging system 6 communicated with the circulation overflow system 5, and a trapping system 7 communicated with the carrier gas purging system 6 and the gas chromatography detector 21;
as shown in fig. 4, the circulation overflow system 5 includes a main overflow box 50 horizontally disposed in the protection box 20, a water inlet drain pipe 51 communicating the bottom of the main overflow box 50 with the filtering device 3, a recovery box 52 horizontally disposed right below the main overflow box 50, and a convection purge communicating vessel 53 vertically disposed at the side of the main overflow box 50 and the recovery box 52;
a circulating negative pressure pump 54 communicated with the main overflow box body 50 is arranged on the recovery box body 52;
the two sides of the main overflow box body 50 close to the upper part are provided with strip-shaped overflow notches 500;
the convection purging communicating vessel 53 comprises a vertical flat channel 530 with an upper end communicated with the strip-shaped overflow notch 500 and a lower end communicated with the recovery tank 52, and a flow guide plate 531 arranged in the vertical flat channel 530; the drainage plate 531 is close to one side of the strip-shaped overflow notch 500;
the carrier gas purging system 6 comprises a gas inlet component 60 arranged at the lower end of the side surface of the vertical flat channel 530, a gas outlet component 61 arranged at the upper end of the side surface of the vertical flat channel 530, and a carrier gas supply device 62 communicated with the gas inlet component 60; the carrier gas in the carrier gas supply device 62 is helium.
The air inlet assembly 60 and the air outlet assembly 61 are both communicated with the vertical flat channel 530 and far away from one side of the strip-shaped overflow notch 500.
The air inlet assembly 60 comprises a strip-shaped air inlet 600 which is arranged on the side surface of the vertical flat channel 530 and is arranged horizontally, a carrier gas guide plate 601 which is arranged in the strip-shaped air inlet 600 and is arranged obliquely, and an electric heating assembly 602 which is arranged in the strip-shaped air inlet 600;
the carrier gas baffle 601 allows carrier gas to flow upwardly within the vertical flat channel 530 and away from the side of the flow guide plate 531.
The air outlet assembly 61 comprises a strip-shaped air outlet 610, and a carrier gas communicating pipe 611 for communicating the strip-shaped air outlet 610 with the trapping system 7; the strip-shaped air outlet 610 is in sealed communication with the vertical flat channel 530 through a horizontally extending separation channel 612; the separation channel 612 is located above the vertical flat channel 530.
As shown in fig. 5, the trapping system 7 includes two sets of condensation pipes 70 respectively communicated with the gas outlet assembly 61, a pyrolyzer 71 disposed in the middle of the condensation pipes 70 and communicated with the two sets of condensation pipes 70, two sets of refrigeration assemblies 73 respectively sleeved outside the condensation pipes 70, and a temperature regulator 72 communicated with the refrigeration assemblies 73;
the pyrolyzer 71 may heat the liquid in the condenser 70 to form a vapor and communicate with the gas chromatography detector 21.
The vertical flat channel 530, the strip-shaped air outlet 610, the strip-shaped air inlet 600 and the strip-shaped overflow notch 500 are all uniform in length.
The refrigeration component 73, the temperature regulator 72, the electric heating component 602, the carrier gas supply device 62, the gas chromatography detector 21, the circulating negative pressure pump 54 and the water pump 31 are all products of the prior art, and the specific product types can be selected by those skilled in the art according to needs.
Example 2
The difference from example 1 is:
as shown in fig. 6, the groundwater collecting rod 10 includes three cylindrical spliced rods 100 connected by a threaded connector 101; the side wall of the cylindrical splicing rod 100 is uniformly provided with rib grooves 102 extending along the axial direction.
As shown in fig. 7, the liquid collection port 11 includes 6 liquid inlet holes 110 uniformly arranged on the lowermost end of the splicing rod 100; the liquid inlet holes 110 are all provided with intercepting filter screens 111 for blocking soil particles;
a soil breaker 14 is arranged under the cylindrical splicing rod 100.
The soil breaker 14 and the interception filter screen 111 are all products in the prior art, and specific product types can be selected by those skilled in the art according to needs.
Example 3
The difference from example 2 is:
as shown in fig. 7, the anti-blocking assembly 15 is sleeved on the lower end of the cylindrical splicing rod 100;
the anti-blocking assembly 15 comprises a mud scraping sleeve 150 movably sleeved on the liquid inlet hole 110 on the side wall of the cylindrical splicing rod 100, a spring element 151 fixedly sleeved on the side wall of the cylindrical splicing rod 100 and having an upper end and a lower end connected with the mud scraping sleeve 150, a connecting lug 152 arranged on the side wall of the mud scraping sleeve 150, and a pull wire 153 connected with the connecting lug 152;
the pull wire 153 can extend to the ground, and the pull wire 153 can pull the mud scraping sleeve 150 upwards to compress the spring element 151 and make the liquid inlet hole 110 leak out.
Claims (9)
1. The detection device for the benzene series in the underground water of the typical pesticide pollution site is characterized by comprising a collection device (1) for collecting underground water, a detection device (2) connected with the collection device (1) and used for detecting the benzene series, and a filtering device (3) arranged between the collection device (1) and the detection device (2);
the collecting device (1) comprises a groundwater collecting rod (10) for entering soil, a liquid collecting port (11) arranged at the lower end of the groundwater collecting rod (10), a suction filtration pipe (12) arranged at the upper end of the groundwater collecting rod (10) and communicated with the filtering device (3), and a collecting communicating pipe (13) arranged at the center of the groundwater collecting rod (10) and communicated with the suction filtration pipe (12) and the liquid collecting port (11);
the detection device (2) comprises a protective box body (20), a gas chromatography detector (21) arranged on the protective box body (20) and used for detecting the benzene series, and a vertical convection purging device (4) arranged in the protective box body (20);
the vertical convection purging device (4) comprises a circulation overflow system (5) communicated with the filtering device (3), a carrier gas purging system (6) communicated with the circulation overflow system (5), and a trapping system (7) communicated with the carrier gas purging system (6) and the gas chromatography detector (21);
the circulating overflow system (5) comprises a main overflow box body (50) horizontally arranged in the protective box body (20), a water inlet drain pipe (51) for communicating the bottom of the main overflow box body (50) with the filtering device (3), a recovery box body (52) horizontally arranged right below the main overflow box body (50), and a convection purging communicating device (53) vertically arranged on the side surfaces of the main overflow box body (50) and the recovery box body (52);
a circulating negative pressure pump (54) communicated with the main overflow box body (50) is arranged on the recovery box body (52);
strip-shaped overflow notches (500) are formed in the two sides, close to the upper part, of the main overflow box body (50);
the convection purging communicating vessel (53) comprises a vertical flat channel (530) with the upper end communicated with the strip-shaped overflow notch (500) and the lower end communicated with the recovery box body (52), and a flow guide plate (531) arranged in the vertical flat channel (530); the drainage plate (531) is close to one side of the strip-shaped overflow notch (500);
the carrier gas purging system (6) comprises a gas inlet assembly (60) arranged at the lower end of the side surface of the vertical flat channel (530), a gas outlet assembly (61) arranged at the upper end of the side surface of the vertical flat channel (530), and a carrier gas supply device (62) communicated with the gas inlet assembly (60);
the air inlet assembly (60) and the air outlet assembly (61) are communicated with the vertical flat channel (530) and are far away from one side of the strip-shaped overflow notch (500).
2. The detection device for the benzene series in the underground water of the typical pesticide pollution site as claimed in claim 1, wherein the air inlet assembly (60) comprises a bar-shaped air inlet (600) which is arranged on the side surface of the vertical flat channel (530) and is arranged horizontally, a carrier gas guide plate (601) which is arranged in the bar-shaped air inlet (600) and is arranged obliquely, and an electric heating assembly (602) which is arranged in the bar-shaped air inlet (600);
the carrier gas baffle (601) may direct carrier gas upward within the vertical flat channel (530) and away from the side of the flow guide plate (531).
3. The detection device for the benzene series in the underground water of the typical pesticide pollution site as claimed in claim 2, wherein the air outlet assembly (61) comprises a strip-shaped air outlet (610), and a carrier gas communicating pipe (611) for communicating the strip-shaped air outlet (610) with the trapping system (7); the strip-shaped air outlet (610) is in sealed communication with the vertical flat channel (530) through a horizontally extending separation channel (612); the separation channel (612) is located above the vertical flat channel (530).
4. The detection device for the benzene series in the underground water of the typical pesticide pollution site according to claim 3, characterized in that the trapping system (7) comprises two groups of condensation pipes (70) respectively communicated with the gas outlet assembly (61), a pyrolyzer (71) arranged in the middle of the condensation pipes (70) and communicated with the two groups of condensation pipes (70), two groups of refrigeration assemblies (73) respectively sleeved outside the condensation pipes (70), and a temperature regulator (72) communicated with the refrigeration assemblies (73);
the pyrolyzer (71) can heat the liquid in the condensing tube (70) to form steam and is communicated with the gas chromatography detector (21).
5. The apparatus for detecting benzene series in groundwater in a typical pesticide pollution site as claimed in claim 3, wherein the vertical flat channel (530), the strip-shaped air outlet (610), the strip-shaped air inlet (600) and the strip-shaped overflow notch (500) are all the same in length.
6. The detection device for the benzene series in the underground water of the typical pesticide pollution site according to the claim 1, characterized in that the underground water collecting rod (10) comprises a plurality of cylindrical spliced rods (100) connected by threaded connectors (101); the side wall of the cylindrical splicing rod (100) is uniformly provided with rib grooves (102) extending along the axial direction.
7. The detection device for the benzene series in the underground water of the typical pesticide pollution site according to claim 1, wherein a liquid extraction port (11) comprises a plurality of liquid inlet holes (110) which are uniformly arranged on the lowermost splicing rod (100); intercepting filter screens (111) for blocking soil particles are arranged on the liquid inlet holes (110);
a soil breaker (14) is arranged under the cylindrical splicing rod (100).
8. The detection device for the benzene series in the underground water of the typical pesticide pollution site as claimed in claim 1, wherein an anti-blocking assembly (15) is sleeved on the lower end of the cylindrical splicing rod (100);
the anti-blocking assembly (15) comprises a mud scraping sleeve (150) movably sleeved at a liquid inlet hole (110) in the side wall of the cylindrical splicing rod (100), a spring element (151) sleeved on the side wall of the cylindrical splicing rod (100) and having a fixed upper end and a lower end connected with the mud scraping sleeve (150), a connecting lug (152) arranged on the side wall of the mud scraping sleeve (150), and a pull wire (153) connected with the connecting lug (152);
the pull wire (153) can extend to the ground, and the pull wire (153) can pull the mud scraping sleeve (150) upwards to compress the spring element (151) and enable the liquid inlet hole (110) to leak out.
9. The detection device for the benzene series in the underground water of the typical pesticide pollution site as claimed in claim 1, wherein the filtering device (3) comprises a precipitation filter chamber (30) communicated with the suction filter pipe (12), a water pump (31) arranged at the joint of the lower end of the precipitation filter chamber (30) and the suction filter pipe (12), a filter assembly (32) arranged at the upper end of the precipitation filter chamber (30), and a supernatant water storage tank (33) arranged at the upper end of the filter assembly (32) and communicated with a water inlet discharge pipe (51).
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