CN111060362A - Multilayer soil gas sampler and sampling method - Google Patents
Multilayer soil gas sampler and sampling method Download PDFInfo
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- CN111060362A CN111060362A CN201911414091.2A CN201911414091A CN111060362A CN 111060362 A CN111060362 A CN 111060362A CN 201911414091 A CN201911414091 A CN 201911414091A CN 111060362 A CN111060362 A CN 111060362A
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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
- G01N1/2294—Sampling soil gases or the like
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Abstract
The invention discloses a multilayer soil gas sampler and a sampling method, wherein the sampler comprises: a plurality of layers of plastic protection casing, through threaded connection between its adjacent two-layer, every plastic protection casing all has the cavity, and is equipped with a plurality ofly on its lateral wall: the aperture is equipped with between two adjacent layers: a partition plate; the cylindrical plastic pipeline is provided with a cavity, penetrates through the cavity of each layer of plastic protection shell, extends to the protection end cover of the plastic protection shell at the bottommost layer and is fixed; the plurality of waterproof breathable hoses are arranged in each layer of plastic protection shell and are wound on the outer side wall of the cylindrical plastic pipeline; and the plurality of air-tight polyurethane pipes are arranged in the cavity of the cylindrical plastic pipeline in a penetrating way, the bottom ends of the air-tight polyurethane pipes are communicated with one end of the waterproof air-tight hose, the top ends of the air-tight polyurethane pipes extend out of the top end of the cylindrical plastic pipeline, and a two-way valve is arranged. The sampler provided by the invention can be used for simultaneously collecting gas in multiple layers of soil, and is convenient to use.
Description
Technical Field
The invention relates to a soil gas sampler, in particular to a multilayer soil gas sampler and a sampling method.
Background
Soil microorganisms decompose soil organic matters and organic nitrogen through mineralization to generate CO2、CH4And N2And greenhouse gases such as O, which are released into the atmosphere by diffusion, dissolved in soil solution, remained in soil pores, or further decomposed and reduced by microorganisms.
The box type sampler (Chamber) has been widely used by researchers at home and abroad for monitoring the emission flux of greenhouse gases in soil, however, the gas samples collected by the box type sampler have apparent net flux after various processes of soil are finished, and the turnover of the gas in the soil cannot be detected, so that various soil gas samplers are developed. For example, chinese patent CN201710127750.9 discloses a simple deep soil gas sampler and a sampling method thereof, in which a waterproof gas-permeable membrane is buried in soil according to a required depth, the sampler is vacuumized and sealed by a gas-permeable tube, and after the gas in the soil pores enters the sampler through the waterproof gas-permeable membrane, the gas sample in the sampler can be taken out and taken back to a laboratory for analysis and measurement. The device can only gather the gas sample of a soil layer once, and need cooperate the vacuum pump to carry out the evacuation operation, and is more troublesome. Chinese patent CN201720263552.0 discloses a soil gas sampler, which is mainly used for punching holes on hard land, cement land or asphalt road surface and then collecting gas samples, and also needs to be matched with a vacuum pump and a storage battery, and the operation is complicated. Chinese patent CN201620792990.1 discloses a soil gas sampling device, which is equipped with a telescopic cylinder, a motor, a drill, a transmission rod, etc., and is more cumbersome to operate and inconvenient to carry.
In conclusion, the existing soil gas sampler is complex to operate, inconvenient to carry and does not consider layered collection of gas samples.
Disclosure of Invention
The invention aims to provide a multilayer soil gas sampler and a sampling method, the sampler solves the problem that the existing sampler can only collect one soil layer gas at a time, can simultaneously collect the gas of multilayer soil and is convenient to use.
In order to achieve the above object, the present invention provides a multi-layered soil gas sampler comprising: the adjacent two layers of plastic protection shells are connected through threads, and the end parts of the plastic protection shells at the topmost layer and the bottommost layer are all fixed with: protection end cover, every plastics protection casing all have the cavity, and be equipped with a plurality ofly on its lateral wall: the aperture is equipped with between two adjacent layers: a partition plate; the cylindrical plastic pipeline is provided with a cavity, penetrates through the cavity of each layer of plastic protection shell, extends to the protection end cover of the plastic protection shell at the bottommost layer and is fixed; the waterproof and breathable hoses are arranged in each layer of plastic protection shell and are wound on the outer side wall of the cylindrical plastic pipeline, the length of the waterproof and breathable hoses is set according to the volume of a required gas sample, and the volume of the waterproof and breathable hoses is equal to that of the required gas sample; and the plurality of air-tight polyurethane pipes are arranged in the cavity of the cylindrical plastic pipeline in a penetrating way, the bottom ends of the air-tight polyurethane pipes are communicated with one end of the waterproof air-tight hose, the top ends of the air-tight polyurethane pipes extend out of the top end of the cylindrical plastic pipeline, and a two-way valve is arranged.
The waterproof and breathable hose in each layer of the plastic protection shell is communicated with the two airtight polyurethane pipes, and two ends of the waterproof and breathable hose are respectively communicated with the bottom ends of the two airtight polyurethane pipes.
Preferably, the waterproof and breathable hose is a PTFE waterproof and breathable hose.
Preferably, the height of the top end of the cylindrical plastic pipe is higher than the water level of the sampling point.
Preferably, the air-impermeable polyurethane tube is black.
Preferably, on the cylindrical plastic pipe, a side wall in each layer of plastic protective shell is provided with: and the air-tight polyurethane pipe penetrates through the threading hole to be communicated with the end part of the waterproof air-permeable hose.
The invention also provides a multilayer soil gas sampling method, which adopts the multilayer soil gas sampler and comprises the following steps:
during sampling, the multilayer soil gas sampler is buried in soil of a sampling point, and the top of the cylindrical plastic pipeline is placed in the air;
will be full of nitrogen gas in the waterproof ventilative hose, and close the two-way valve on ventilative polyurethane pipe top, treat that the nitrogen gas in the waterproof ventilative hose reaches balanced back with the gaseous interchange in the soil/deposit hole of sampling point, be connected to nitrogen gas the air inlet of ventilative polyurethane pipe, the gas outlet that the sampling vacuum flask is connected to ventilative polyurethane pipe open the two-way valve gathers gas, to the gaseous survey greenhouse gas concentration of gathering, for the gaseous greenhouse gas concentration when soil/deposit hole internal balance.
Preferably, the method for filling nitrogen gas in the waterproof breathable hose comprises the following steps: be connected to nitrogen gas the air inlet of airtight polyurethane pipe, the gas outlet that the sampling vacuum flask is connected to airtight polyurethane pipe opens the two-way valve, through the sampling vacuum flask drainage the air in the waterproof ventilative hose to be full of nitrogen gas waterproof ventilative hose.
Preferably, the sampling vacuum bottle is obtained by vacuumizing the sampling bottle.
Preferably, the in-bottle pressure is measured on the sampling vacuum bottle.
The multilayer soil gas sampler solves the problem that the existing sampler can only collect one soil layer gas at a time, and has the following advantages:
(1) the sampler can simultaneously collect gas samples of different soil layer depths at the same place, thereby exploring the distribution characteristics of the soil/sediment pore gas in the vertical direction;
(2) the sampler provided by the invention adopts the PTFE waterproof breathable hose, can realize water prevention and gas sampling at the same time, and is suitable for collecting soil pore gas samples such as a paddy field, a wetland and the like with high soil humidity;
(3) the sampler of the invention can be used for long-term positioning and monitoring the soil/sediment pore gas concentration at the same place at different time, and can also be used for monitoring the respiratory gas of the marked plant root system;
(4) the sampler has better sealing performance and simple and convenient operation, and is beneficial to reducing experimental errors;
(5) the sampler provided by the invention is simple and reasonable in design, low in cost, convenient to carry, extremely simple in operation and suitable for field sampling.
Drawings
FIG. 1 is a schematic structural diagram of a multi-layer soil gas sampler according to the present invention.
FIG. 2 is a perspective view of the multi-layered soil gas sampler of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A multi-layer soil gas sampler is shown in figure 1, which is a schematic structural diagram of the multi-layer soil gas sampler of the invention, and is shown in figure 2, which is a schematic perspective diagram of the multi-layer soil gas sampler of the invention, and the sampler comprises: the adjacent two layers of plastic protection shells 2 are connected through threads, and the end parts of the plastic protection shells 2 at the topmost layer and the bottommost layer are all fixed with: protection end cover, every plastics protection casing 2 all has the cavity, and is equipped with a plurality ofly on its lateral wall: the aperture is equipped with between two adjacent layers: a partition plate; a cylindrical plastic pipe 4 having a cavity, which passes through the cavity of each layer of plastic protective shell 2 and extends to the protective end cap of the plastic protective shell 2 at the bottommost layer and is fixed; the waterproof and breathable hoses 1 are arranged in each layer of plastic protection shell 2 and wound on the outer side wall of the cylindrical plastic pipeline 4, the length of the waterproof and breathable hoses is set according to the volume of a required gas sample, and the volume of the waterproof and breathable hoses is equal to the volume of the required gas sample; and a plurality of air-tight polyurethane tubes 3 which are arranged in the cavity of the cylindrical plastic pipeline 4 in a penetrating way, the bottom ends of the air-tight polyurethane tubes are communicated and sealed with one end of the waterproof and air-tight hose 1 (the joint is ensured to be air-tight), the top ends of the air-tight polyurethane tubes extend out of the top end of the cylindrical plastic pipeline 4, and a two-way valve is arranged.
Wherein, the waterproof and breathable hose 1 in each layer of the plastic protective shell 2 is communicated with the two airtight polyurethane pipes 3, and the two ends of the waterproof and breathable hose 1 are respectively communicated with the bottom ends of the two airtight polyurethane pipes 3.
Further, the waterproof and breathable hose 1 is a PTFE waterproof and breathable hose.
Further, the height of the top end of the cylindrical plastic pipe 4 is higher than the water level of the sampling point.
Further, the air-impermeable polyurethane tube 3 is black.
Further, on the cylindrical plastic pipe 4, the side wall in each layer of plastic protection shell 2 is provided with: and a threading hole through which the airtight polyurethane tube 3 passes to communicate with the end of the waterproof and breathable hose 1.
The invention also provides a multilayer soil gas sampling method, the multilayer soil gas sampler adopted by the method comprises:
during sampling, the multilayer soil gas sampler is buried in the soil of a sampling point, and the top of the cylindrical plastic pipeline 4 is placed in the air;
the method comprises the steps of filling nitrogen into a waterproof breathable hose 1, closing a two-way valve at the top end of an airtight polyurethane tube 3, connecting the nitrogen to an air inlet of the airtight polyurethane tube 3 after the nitrogen in the waterproof breathable hose 1 is exchanged with the gas in soil/sediment pores of sampling points to be balanced, connecting a sampling vacuum bottle to an air outlet of the airtight polyurethane tube 3, opening the two-way valve to collect gas, measuring the concentration of greenhouse gas in the collected gas, and measuring the concentration of the greenhouse gas for balancing in the soil/sediment pores.
Further, the method for filling the waterproof breathable hose 1 with nitrogen comprises the following steps: connecting nitrogen to the air inlet of the air-tight polyurethane tube 3, connecting the sampling vacuum bottle to the air outlet of the air-tight polyurethane tube 3, opening the two-way valve, pumping air in the waterproof air-permeable hose 1 through the sampling vacuum bottle, and filling the waterproof air-permeable hose 1 with nitrogen.
Further, the sampling vacuum bottle is obtained by vacuumizing the sampling bottle.
Further, the in-bottle pressure was measured on a sampling vacuum bottle.
Example 1
A multi-layered soil gas sampler comprising: a PTFE waterproof and breathable hose 1, a three-layer plastic protection shell 2, an air-tight polyurethane tube 3 and a cylindrical plastic pipeline 4. Wherein, every layer of plastics protection casing 2 all has the cavity, and is equipped with a plurality ofly on its lateral wall: and (4) a small hole. Through threaded connection between two adjacent layers of plastic protection casing 2, the tip that is in plastic protection casing 2 of topmost layer and bottommost all fixes (can adopt threaded connection fixed) has: and the protective end cover plays a role in protecting the inner hose. The cylindrical plastic pipe 4 has a cavity which passes through the cavity of each layer of plastic protecting shell 2 and extends to and is fixed to the protecting end cap of the plastic protecting shell 2 at the bottommost layer, the protecting end cap of the plastic protecting shell 2 at the topmost layer is provided with a through hole, and the cylindrical plastic pipe 4 passes through the through hole. The PTFE waterproof and breathable hose 1 is wound on the outer side wall of the cylindrical plastic pipe 4, and the length of the hose is set according to the volume of the required gas sample. The airtight polyurethane pipe 3 is provided with 6, wears to establish in cylindrical plastic conduit 4's cavity, and the bottom of per two communicates respectively with the both ends of the waterproof ventilative hose 1 of PTFE, and the top stretches out from cylindrical plastic conduit 4's top, and all is equipped with the two-way valve.
Specifically, the cylindrical plastic pipeline 4 is provided with a threading hole on the side wall of each layer, and the two airtight polyurethane pipes 3 penetrate out of the threading holes to be communicated with the PTFE waterproof and breathable hose 1.
The length of the PTFE waterproof breathable hose 1 is set according to the volume of a required gas sample, the volume of the PTFE waterproof breathable hose is equal to the volume of the required gas sample, the PTFE waterproof breathable hose can be replaced every time according to the volume of a sampling bottle, the PTFE waterproof breathable hose is used for balanced exchange of soil/sediment gas and gas in the hose, gas sampling can be carried out while water resistance is achieved, and the PTFE waterproof breathable hose is suitable for collection of soil pore gas samples such as a paddy field and a wetland with large soil humidity.
The plastic protection shell 2 is used for protecting the PTFE waterproof breathable hose 1 while ventilating, and ensures the gas circulation in the soil/sediment pores for collecting gas samples of different soil layers.
The air-tight polyurethane tube 3 is black, avoids sunshine from directly shining, avoids any possible photochemical reaction, is communicated with the PTFE waterproof air-permeable hose 1, and is used for conveying out a gas sample in the PTFE waterproof air-permeable hose 1, and a two-way valve arranged at the end part of the tube is convenient for sealing and gas sample collection.
The cylindrical plastic pipe 4 is used for protecting the airtight polyurethane pipe 3, and the height thereof can be determined according to whether the sample is flooded or not and the flooding height.
The use method of the multilayer soil gas sampler comprises the following steps:
during sampling, firstly digging a pit at a required sampling point, burying the multilayer soil gas sampler of the invention into soil, and covering with soil to ensure that the top of the cylindrical plastic pipeline 4 is placed in the air.
Taking an air bag filled with nitrogen, taking another sampling bottle, vacuumizing the sampling bottle and measuring the pressure in the bottle, wherein the volume of the sampling bottle is the same as that of the PTFE waterproof and breathable hose 1. Connecting a nitrogen gas bag to the gas inlet of the airtight polyurethane tube 3, connecting a vacuum bottle to the gas outlet of the airtight polyurethane tube 3, opening a valve of a two-way valve, then, drying the air in the PTFE waterproof and breathable hose 1 by using a vacuum sampling bottle, conveying the nitrogen into the PTFE hose, and filling the nitrogen to remove the residual target gas in the hoseBody (i.e. target gas of measurement, e.g. CO)2、CH4Or N2O) such that the measured gas concentration is at soil/sediment physical equilibrium and not the concentration previously remaining in the hose. And closing the two-way valve of the air inlet and the air outlet immediately after sampling. Different soil layers are treated in the same way, and each air-tight polyurethane pipe 3 is an inlet/outlet and a mark is made on which soil layer.
The gas has the diffusion motion in the soil, PTFE waterproof ventilation hose 1 can make the motion of gas inside and outside the hose, treat the nitrogen gas in PTFE waterproof ventilation hose 1 and the gas interchange in the soil deposit hole and reach balanced back, can carry out gas sample collection with vacuum flask and nitrogen bag once more, operation is the same with the operation of filling nitrogen gas in PTFE waterproof ventilation hose 1 when carrying out gas sample collection, determine its greenhouse gas concentration this moment and be balance time greenhouse gas concentration in soil deposit hole promptly, should pay attention to close the two-way valve and make the device be in encapsulated situation after every gas sample collection.
After the gas is collected, the sample can be measured by gas chromatography or other instruments.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (9)
1. A multi-layered soil gas sampler, the sampler comprising:
a plurality of layers of plastic protection shells (2) are connected by screw threads between two adjacent layers, and the end parts of the plastic protection shells (2) at the topmost layer and the bottommost layer are all fixed with: protection end cover, every plastics protection casing (2) all have the cavity, and be equipped with a plurality ofly on its lateral wall: the aperture is equipped with between two adjacent layers: a partition plate;
a cylindrical plastic pipeline (4) which is provided with a cavity, penetrates through the cavity of each layer of plastic protection shell (2), extends to the protection end cover of the plastic protection shell (2) at the bottommost layer and is fixed;
the waterproof and breathable hoses (1) are arranged in each layer of plastic protection shell (2) and are wound on the outer side wall of the cylindrical plastic pipeline (4), the length of the hoses is set according to the volume of a required gas sample, and the volume of the hoses is equal to that of the required gas sample; and
the air-tight polyurethane tubes (3) are arranged in the cavity of the cylindrical plastic pipeline (4) in a penetrating manner, the bottom ends of the air-tight polyurethane tubes are communicated with one end of the waterproof air-tight hose (1), the top ends of the air-tight polyurethane tubes extend out of the top end of the cylindrical plastic pipeline (4), and a two-way valve is arranged on the top ends of the air-tight polyurethane tubes;
the waterproof and breathable hose (1) in each layer of the plastic protection shell (2) is communicated with the two airtight polyurethane pipes (3), and two ends of the waterproof and breathable hose (1) are respectively communicated with the bottom ends of the two airtight polyurethane pipes (3).
2. The multi-layer soil gas sampler according to claim 1 wherein the waterproof and gas-permeable hose (1) is a PTFE waterproof and gas-permeable hose.
3. The multi-layer soil gas sampler as claimed in claim 1 wherein the cylindrical plastic pipe (4) has a top end at a height above the water level of the sampling point.
4. The multi-layered soil gas sampler according to claim 1 wherein the gas-impermeable polyurethane tube (3) is black.
5. The multilayer soil gas sampler according to claim 1, wherein the cylindrical plastic pipe (4) is provided with, on the side wall inside each layer of plastic protective housing (2): and the air-tight polyurethane pipe (3) penetrates through the threading hole to be communicated with the end part of the waterproof and air-permeable hose (1).
6. A multi-layered soil gas sampling method using the multi-layered soil gas sampler according to any one of claims 1 to 5, comprising:
during sampling, the multilayer soil gas sampler is buried in soil of a sampling point, and the top of the cylindrical plastic pipeline (4) is placed in the air;
will be full of nitrogen gas in waterproof ventilative hose (1), and close the bi-pass valve on ventilative polyurethane pipe (3) top, treat the nitrogen gas in waterproof ventilative hose (1) and the gaseous interchange in the soil/deposit hole of sampling point and reach balanced back, be connected to nitrogen gas the air inlet of ventilative polyurethane pipe (3), the gas outlet that the sampling vacuum flask is connected to ventilative polyurethane pipe (3) is opened the bi-pass valve gathers gas, surveys greenhouse gas concentration to the gas measurement of gathering, for greenhouse gas concentration when soil/deposit hole internal balance.
7. The multilayer soil gas sampling method according to claim 6, wherein the waterproof and gas-permeable hose (1) is filled with nitrogen by the method comprising: be connected to nitrogen gas the air inlet of airtight polyurethane pipe (3), the gas outlet that the sampling vacuum flask is connected to airtight polyurethane pipe (3) is opened the two-way valve is pumped through the sampling vacuum flask air in waterproof ventilative hose (1) to be full of nitrogen gas waterproof ventilative hose (1).
8. The multi-layered soil gas sampling method according to claim 6, wherein the sampling vacuum bottle is obtained by applying vacuum to the sampling bottle.
9. The method of multi-layered soil gas sampling according to claim 6, wherein the in-bottle pressure is measured on the sampling vacuum bottle.
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| CN201911414091.2A CN111060362A (en) | 2019-12-31 | 2019-12-31 | Multilayer soil gas sampler and sampling method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111947996A (en) * | 2020-09-01 | 2020-11-17 | 中国农业科学院农业资源与农业区划研究所 | In-situ soil profile greenhouse gas collecting device |
| CN112051386A (en) * | 2020-09-16 | 2020-12-08 | 西南民族大学 | Soil methane detection device and method |
| CN112729975A (en) * | 2020-12-24 | 2021-04-30 | 北京林业大学 | Device for continuously obtaining gaseous moisture sample of forest ecosystem in situ |
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2019
- 2019-12-31 CN CN201911414091.2A patent/CN111060362A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111947996A (en) * | 2020-09-01 | 2020-11-17 | 中国农业科学院农业资源与农业区划研究所 | In-situ soil profile greenhouse gas collecting device |
| CN112051386A (en) * | 2020-09-16 | 2020-12-08 | 西南民族大学 | Soil methane detection device and method |
| CN112051386B (en) * | 2020-09-16 | 2022-07-01 | 西南民族大学 | Soil methane detection device and method |
| CN112729975A (en) * | 2020-12-24 | 2021-04-30 | 北京林业大学 | Device for continuously obtaining gaseous moisture sample of forest ecosystem in situ |
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