CN105865859A - Gas sampling device applicable to soil at different depths in perennially frozen soil zone - Google Patents
Gas sampling device applicable to soil at different depths in perennially frozen soil zone Download PDFInfo
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- CN105865859A CN105865859A CN201610361750.0A CN201610361750A CN105865859A CN 105865859 A CN105865859 A CN 105865859A CN 201610361750 A CN201610361750 A CN 201610361750A CN 105865859 A CN105865859 A CN 105865859A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
- G01N2001/242—Injectors or ejectors
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Abstract
The invention discloses a gas sampling device applicable to soil at different depths in a perennially frozen soil zone. The device is characterized in that a hollow gas collecting cavity is a double-deck cylindrical barrel, vent holes are formed in the inner wall and the outer wall of the barrel, and the bottom and top of the barrel are sealed; a semipermeable membrane is located in the middle of the double-deck cylindrical barrel, the hollow gas collecting cavity is closely connected with an exhaust pipe, the lower end of the exhaust pipe penetrates through the top of the hollow gas collecting cavity and goes deep into the middle portion inside the cavity, and the upper end of the exhaust pipe is connected with a four-way valve; the left end and the right end of the four-way valve are each connected with an air bag, the rest end of the four-way valve is connected with a straight-through valve, a silica gel stopper is arranged at the end of the straight-through valve, and a syringe is inserted into the silica gel stopper. The gas sampling device is easy to install, low in manufacturing cost, reasonable in design and capable of being widely applied to collecting, monitoring and researching of greenhouse gas emission in farmland, refuse landfill, grassland, frozen soil zones and the like.
Description
Technical field
The present invention relates to a kind of soil environment research monitoring auxiliary equipment, be specifically related to one and be applicable to Han Qu especially permafrost region soil gas sampling apparatus.
Background technology
In recent years, carbon containing greenhouse gases (CO in soil2、CH4) discharge the focus having become International Carbon circulating research.The carbon emission process generation radical change of the soil body will be caused for Han Qu especially Permafrost Area, global warming and the change of freeze thawing general layout, discharge substantial amounts of CO to air2And CH4Isothermal chamber gas, strengthens the trend of climate warming, forms the positive feedback effect to climate change.Therefore, in permafrost region soil body frozen-thaw process, exactly gather soil gas sample be research global warming and freeze thawing general layout change on soil carbon discharge impact and the premise of mechanism.But, in view of cold district harsh climate environment and the distinctive frozen-thaw process of the top layer soil body so that conventional soil gas collection method (pre-buried sampling bottle method, straight cutting take trachea method etc.) is difficult to play useful effect.Conventional soil gas collection device is vulnerable to soil body unfreezing and destroys, and is difficult to collect soil gas because of capillary tube blocking, moisture accumulation thawing season at the soil body, thus causes this kind of soil gas sampler to lose efficacy.
At present, it is adaptable to the soil gas sampler wide variety in conventional area, and have related application, such as:
Chinese patent (Application No. 201410607680.3) discloses one " anti-pollution soil gas sampler ", its essence is mainly by squeezing into soil desired depth by top with the hollow drill pipe of pore, and then soil gas is sampled by recycling flexible pipe.The capillary tube of this device is easy to blocking during the soil body squeezed into by drilling rod, and or soil body moisture higher at water level higher in the case of moisture be easily accessible inside drilling rod, cause being difficult to collect soil gas；Moreover, in cold district soil body frozen-thaw process, this device is easily subject to the impact of lifting by frost effect, causes soil gas sample position to produce deviation with desired depth.Therefore, this device is only applicable to that level of ground water is relatively low, sandy soil and there is not the soil gas collection in conventional area of unfreezing, samples for cold district soil gas, and this device is difficult to play useful effect.
Also have, the patent of invention of Application No. 201410676771.2 discloses one " soil gas sampler ", its essence is different depth of the many gas collecting pipe levels respectively with micropore being placed into the soil, by airway, the gas in every collection tube is acquired the most again.This device needs to excavate soil profile during pre-buried collection tube, is horizontally inserted in different depth soil by collection tube the most again.In soil profile digging process, the soil body is by strong disturbance；And gas collecting pipe is when being horizontally inserted in soil, the micropore on collection tube easily blocks.Furthermore, in or soil moisture infitration process higher at soil body water level, easy hydrops in collection tube and cause being difficult to collect soil gas.Therefore, this device, for the collection of soil gas, is installed and is laid trouble, big to soil disturbance, cause gas sample acquisition result distortion；And, being affected by oozing under level of ground water and soil moisture, in collection tube, easy hydrops, causes being difficult to collect soil gas.Therefore, this device is relatively specific for unsaturation sandy soil area, and therefore, this device is difficult to the collection of cold district soil gas sample.
For another example, Application No. 201110159118.5 patent of invention discloses " a kind of buffer type soil gas sampling device ", its essence is and measures CO by being used for2、CH4And N2The static chamber of O isothermal chamber gas flux is improved after setting up air bag and is formed, although this device preferably solves existing soil gas sampler for want of buffering air pressure structure and easily cause the defect that casing leaks gas forward or backwards and soil gas release is easily suppressed by memory box air pressure, but this device is only used for measuring total emission flux of surface soil gas, it is impossible to gather the soil gas of the internal different levels of soil.Therefore, for realizing the collection analysis of cold district different depth soil gas, this device cannot meet requirement.
Therefore, in cold district Soil Trace Gases Study on Emission, design and a kind of can overcome the impact of soil body unfreezing, there is the soil gas collection device of water-gas separation function, district's soil carbon discharge process trembled with fear for profound understanding and mechanism of action, raising research level tool are of great significance.
Summary of the invention
In view of above-mentioned, it is an object of the invention to provide one and be applicable to Permafrost Area different depth soil gas sampler, overcome soil body unfreezing to cause gas sampling device hydrops, air inlet easily to block and leak gas forward or backwards due to casing and soil gas release is easily by drawbacks such as memory box air pressure suppression, it is ensured that the measurement result of the taken gas sample in tested soil body position is closer to actual value.
The object of the invention is achieved through the following technical solutions:
One is applicable to Permafrost Area different depth soil gas sampler, and this device is made up of hollow gas collection chamber, semipermeable membrane, exhaust tube, air bag, four way valve, straight-through valve, silica gel plug and syringe.Wherein, the double-layer circular column-shaped barrel that hollow gas collection chamber is made by materials such as lucite, PVC or rustless steels, cylinder inside and outside wall uniformly offers passage, cylinder body bottom and top and seals；Semipermeable membrane is positioned in the middle of double-layer circular column-shaped barrel, hollow gas collection chamber and exhaust tube compact siro spinning technology, and inside cavity middle part is goed deep into through hollow gas collection chamber top in exhaust tube lower end, and exhaust tube upper end is connected with four way valve；The two ends, left and right of four way valve respectively connect an air bag, and another port of four way valve connects straight-through valve, and the port of straight-through valve is provided with silica gel plug, and syringe inserts in silica gel plug.
The principle of the present invention is:
Soil gas collection tank is made double-layer circular column structure, ectonexine cylindrical sides uniformly offers the air vent channel of larger aperture, two cylinder intermediate courses arrange semipermeable membrane and (only allow gas molecule to pass through under gas concentration difference drives, and exclusion of water molecule enters), thus solve during soil body frozen-thaw process and device are buried underground, avoid the problems such as collection and confinement of gases cavity hydrops gentle hole path blocking；The two upper and lower two ends of cylinder of collection and confinement of gases casing all seal, and only offering a gas port on top causes earth's surface by flexible pipe, in order to the extraction of gas sample.Soil gas is caused to discharge the defect suppressed by cavity internal memory air pressure for avoiding soil gas sampling cavity for want of buffering air pressure structure, by setting up the gas atmosphere in air bag regulation soil internal gas sampling cavity body on the above airway in ground: when the release of soil internal gas causes cavity internal gas pressure to raise, air bag outward expansion is so that the inside and outside air pressure of cavity keeps balance；When extracting gas sample and making cavity internal gas pressure progressively reduce, air bag shrinks therewith, so that the inside and outside air pressure of cavity remains in that balance.Meanwhile, by observe air bag swelling state, it is judged that the size of inside cavity air pressure and collect soil gas number.
The invention have the advantage that
The invention provides one and be applicable to Permafrost Area different depth soil gas sampler, semipermeable membrane structure is have employed in the middle of the double-layer circular column-shaped barrel of this device hollow gas collection chamber, only allow soil gas through and stop steam to pass through, it is to avoid soil drawback of the easy hydrops of collection and confinement of gases cavity in frozen-thaw process and precipitation infitration process；The air guide channel aperture offered on double-layer circular cylindrical chamber is relatively big, can be prevented effectively from air inlet blocking and cause taking gas failure；Simultaneously, the air bag installed on exhaust tube can the air pressure of soil inside and outside active balance cavity, overcome the difficult problem that soil gas release process is suppressed, ensure that device collect at whole soil gas, the quality of gaseous sample in sampling process, in guaranteeing cavity, tested gas concentration is consistent with the gas concentration of surveyed depth of soil, improves the reliability of soil gas emission monitoring result；This device can be embedded in the different soils degree of depth by earth boring auger, to sample and soil layer disturbance is little, gas sample concordance is good, it is ensured that the verity of surveyed data and accuracy, it is possible to achieve soil gas monitoring fixed point, long-term Continuous Observation.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention.
In Fig. 1,1 hollow gas collection chamber；2 air-vents；3 exhaust tubes；4 air bags；5 four way valves；6 straight-through valves；7 silica gel plugs；8 syringes；9 semipermeable membranes.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment, technical scheme is described further:
One is applicable to Permafrost Area different depth soil gas sampler, and this device is made up of hollow gas collection chamber 1, semipermeable membrane 9, exhaust tube 3, air bag 4, four way valve 5, straight-through valve 6, silica gel plug 7 and syringe 8.Wherein, hollow gas collection chamber 1 is the double-layer circular column-shaped barrel made by materials such as lucite, PVC or rustless steels, and cylinder inside and outside wall uniformly offers passage 2, cylinder body bottom and top and seals；Semipermeable membrane 9 is positioned in the middle of double-layer circular column-shaped barrel, have only allow gas molecule through and the performance, the gas in soil that stop steam to pass through enters inside cavity through semipermeable membrane 9 under Concentraton gradient or pressure differential effect；Hollow gas collection chamber 1 and exhaust tube 3 compact siro spinning technology, exhaust tube 3 lower end passes hollow gas collection chamber 1 top and gos deep into inside cavity middle part, and exhaust tube 3 upper end is connected with four way valve 5；The two ends, left and right of four way valve 5 respectively connect an air bag 4, and air bag is to be prepared from membrane vesicle by airtight, quality frivolous soft right and that retractility is good rubber, polyurethane or latex.Another port of four way valve 5 connects straight-through valve 6；Straight-through valve 6 is the keying of exhaust tube 3 in time using syringe 8 to extract gas, and the material of exhaust tube 3 can be rustless steel, rubber or politef；Silica gel plug 7 is placed in the port of straight-through valve 6, plays the effect of further airtight exhaust tube 3；Syringe 8 inserts the gas in silica gel plug 7, in extracting cavity body.
Study on Emission for Han Qu especially permafrost region Soil Trace Gases, it usually needs gather the soil gas in 2 meters of scopes the most deeper, and owing to frozen-thaw process melting soil usually supersaturation and moisture accumulation at sharp side.Before extraction soil gas, take boring with earth boring auger and hollow gas collection chamber 1 is placed in desired depth, exhaust tube 3 is caused ground, is then layered and the soil of taking-up is backfilling and compacted；Along with the gas in soil progresses into hollow gas collection chamber 1, the gas concentration in cavity increases, air pressure raises, so that the air bag 4 investing exhaust tube 3 left and right sides expands.The maximum swelling volume of air bag 4 tests the continuous 4 times gas sample volumes of each 50 milliliters more than or equal to field monitoring.Hollow gas collection chamber 1 gas sample is extracted according to the time interval syringe 8 that test plan sets.Air pressure in hollow gas collection chamber 1 reduces, and air bag 4 shrinks to keep the air pressure balance in hollow gas collection chamber 1 the most therewith.With the gas chromatograph greenhouse gases (CO to the gas sample of extraction2、CH4、N2O) concentration is analyzed, and calculates the emission flux of corresponding soils greenhouse gases.
Claims (2)
1. one kind is applicable to Permafrost Area different depth soil gas sampler, this device is made up of hollow gas collection chamber (1), semipermeable membrane (9), exhaust tube (3), air bag (4), four way valve (5), direct-through valve (6), silica gel plug (7) and syringe (8), it is characterized in that the double-layer circular column-shaped barrel that hollow gas collection chamber (1) is made by materials such as lucite, PVC or rustless steels, cylinder inside and outside wall uniformly offers passage (2), cylinder body bottom and top and seals；Semipermeable membrane (9) is positioned in the middle of double-layer circular column-shaped barrel, hollow gas collection chamber (1) and exhaust tube (3) compact siro spinning technology, inside cavity middle part is goed deep into through hollow gas collection chamber (1) top in exhaust tube (3) lower end, and exhaust tube (3) upper end is connected with four way valve (5)；The two ends, left and right of four way valve (5) respectively connect an air bag (4), and four way valve (5) remains a port and connects straight-through valve (6), and the port of straight-through valve (6) is provided with silica gel plug (7), and syringe (8) inserts in silica gel plug (7).
The most according to claim 1, one is applicable to Permafrost Area different depth soil gas sampler, it is characterized in that the maximum swelling volume of air bag (4) tests the continuous 4 times gas sample volumes of each 50 milliliters more than or equal to field monitoring.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610361750.0A CN105865859A (en) | 2016-05-29 | 2016-05-29 | Gas sampling device applicable to soil at different depths in perennially frozen soil zone |
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| CN201610361750.0A CN105865859A (en) | 2016-05-29 | 2016-05-29 | Gas sampling device applicable to soil at different depths in perennially frozen soil zone |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106442010A (en) * | 2016-11-16 | 2017-02-22 | 江苏智石科技有限公司 | Soil solution automatic extraction control device |
| CN107271473A (en) * | 2017-08-22 | 2017-10-20 | 中国科学院寒区旱区环境与工程研究所 | The indoor simulated system that frozen-thaw process influences on soil environment |
| CN107607369A (en) * | 2017-09-13 | 2018-01-19 | 中国地质科学院岩溶地质研究所 | A kind of Timing telescopic portable water air interface or Soil Trace Gases harvester |
| CN107966331A (en) * | 2017-10-23 | 2018-04-27 | 中国科学院东北地理与农业生态研究所 | The harvester and method that field test soil-plant system organic pollution soil-gas exchanges |
| CN108732306A (en) * | 2018-05-02 | 2018-11-02 | 北京林业大学 | A kind of karst carbon sink process measurement device and method |
| CN109764999A (en) * | 2019-02-14 | 2019-05-17 | 河海大学 | A kind of gas pressure measurement sensor |
| CN109900768A (en) * | 2017-12-07 | 2019-06-18 | 核工业北京地质研究院 | A method of for extracting SOIL GAS medium and deep uranium mineralization information |
| CN110907238A (en) * | 2019-12-10 | 2020-03-24 | 杭州电子科技大学 | Layered collection method and device for soil gas |
| CN112630092A (en) * | 2020-12-15 | 2021-04-09 | 阜阳科优检测科技有限公司 | Soil pollution in-situ detection device based on semipermeable membrane |
| CN114544224A (en) * | 2022-01-14 | 2022-05-27 | 重庆市生态环境科学研究院 | Soil sampling and soil gas sampling integrated device |
| CN114544224B (en) * | 2022-01-14 | 2024-06-04 | 重庆市生态环境科学研究院 | Soil sampling and soil gas sampling integrated device |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106442010A (en) * | 2016-11-16 | 2017-02-22 | 江苏智石科技有限公司 | Soil solution automatic extraction control device |
| CN107271473A (en) * | 2017-08-22 | 2017-10-20 | 中国科学院寒区旱区环境与工程研究所 | The indoor simulated system that frozen-thaw process influences on soil environment |
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| CN107607369A (en) * | 2017-09-13 | 2018-01-19 | 中国地质科学院岩溶地质研究所 | A kind of Timing telescopic portable water air interface or Soil Trace Gases harvester |
| CN107966331A (en) * | 2017-10-23 | 2018-04-27 | 中国科学院东北地理与农业生态研究所 | The harvester and method that field test soil-plant system organic pollution soil-gas exchanges |
| CN109900768A (en) * | 2017-12-07 | 2019-06-18 | 核工业北京地质研究院 | A method of for extracting SOIL GAS medium and deep uranium mineralization information |
| CN109900768B (en) * | 2017-12-07 | 2021-10-22 | 核工业北京地质研究院 | Method for extracting deep uranium mineralization information in soil gas |
| CN108732306A (en) * | 2018-05-02 | 2018-11-02 | 北京林业大学 | A kind of karst carbon sink process measurement device and method |
| CN108732306B (en) * | 2018-05-02 | 2024-03-22 | 北京林业大学 | Karst carbon sink process measuring device and method |
| CN109764999A (en) * | 2019-02-14 | 2019-05-17 | 河海大学 | A kind of gas pressure measurement sensor |
| CN110907238A (en) * | 2019-12-10 | 2020-03-24 | 杭州电子科技大学 | Layered collection method and device for soil gas |
| CN112630092A (en) * | 2020-12-15 | 2021-04-09 | 阜阳科优检测科技有限公司 | Soil pollution in-situ detection device based on semipermeable membrane |
| CN112630092B (en) * | 2020-12-15 | 2023-12-19 | 阜阳科优检测科技有限公司 | Soil pollution normal position detection device based on semi-permeable membrane |
| CN114544224A (en) * | 2022-01-14 | 2022-05-27 | 重庆市生态环境科学研究院 | Soil sampling and soil gas sampling integrated device |
| CN114544224B (en) * | 2022-01-14 | 2024-06-04 | 重庆市生态环境科学研究院 | Soil sampling and soil gas sampling integrated device |
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