CN214794032U - Gas sample in-situ sampling device - Google Patents
Gas sample in-situ sampling device Download PDFInfo
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- CN214794032U CN214794032U CN202022548722.4U CN202022548722U CN214794032U CN 214794032 U CN214794032 U CN 214794032U CN 202022548722 U CN202022548722 U CN 202022548722U CN 214794032 U CN214794032 U CN 214794032U
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Abstract
The utility model belongs to the technical field of gaseous sample sampling, a gaseous sample normal position sampling device is related to. The gas sample in-situ sampling device comprises a sampling pipe and a sample storage pipe; the sample storage tube is detachably covered on the sampling tube to form a sample storage inner cavity; the side wall of the sampling tube is provided with a hole part, and the sample storage inner cavity side of the hole part is provided with a gas exchange film layer; a metal punching mesh is arranged on the outer side of the hole opening part, and a liquid-gas exchange cavity is formed between the gas exchange film layer and the metal punching mesh; one end of the sample storage tube far away from the sampling tube is provided with a plug body and also comprisesAnd the gas suction pipe penetrates through the plug body, and a valve body is arranged on one side of the gas suction pipe, which is far away from the sample storage pipe. The utility model discloses can be under the condition of not disturbing the soil section to the CH of the different degree of depth of paddy field soil4The gas is sampled in situ, the process is simple and convenient, the measurement is accurate, meanwhile, the artificial disturbance to a soil system is reduced to the maximum extent, and the reliability and the stability of sampling results are guaranteed under the conditions of different paddy field soil moisture.
Description
Technical Field
The utility model belongs to the technical field of gaseous sample sampling, a gaseous sample normal position sampling device is related to.
Background
Stable carbon isotopes (13C) The tracing technology is an important technical means for researching the fixation, distribution and transformation of the rice C and the biological and geological cyclic process of the rice C in the soil, and the application thereof13The C isotope tracing technology can safely and reliably carry out test implementation and determination. According to13The difference of C mark frequency is mainly 3 methods internationally: single pulse marks, repetitive pulse marks, and sustain marks. The pulse mark is a single-dose mark13C tracer technical method, common in agricultural research at present13The C marker mainly comprises13CO2、13C-cellulose,13C-hemicellulose and13c-glucose, and the like. Compared with other marking technologies, the pulse marking has multiple advantages, the application scene relates to the related research of plant C fixation, distribution and transportation under natural and artificial ecosystem conditions, substance distribution and transformation information of plants at different growth stages can be provided, the transformation condition of plant-related metabolites in soil can be dynamically monitored, and the transformation and migration processes of C in an atmosphere-plant-soil system can be accurately reflected.
In recent years, it has become possible to provide,13the application of the C labeling technology in the C metabolism and transformation process in the paddy field soil has attracted extensive attention of the relevant academic community. To be provided with13CO2The tracer is taken as an example, and a large number of researches show that13Removing one C marker after the C marker enters a rice field ecological system through rice plant photosynthesisPart of the plant is fixed by the rice plant to become the biomass of the rice plant, and most of the plant is fixed by the rice plant13The C marker re-enters the atmosphere or the soil system through the respiration of the plant or in the form of root exudates. CH (CH)4Is an important product of the C cycle process of the paddy soil and simultaneously has CH4Also second only to CO2The second greenhouse gas of (1). School world for CH4The research on the source, distribution and transformation rules of the metabolic substrates in the soil of the rice field is more and more important, and13the C marking technology can accurately reflect the CH direction of a C substrate in a plant-soil-atmosphere system4The transformation process of (1). The key point of the method is whether to accurately quantify different point positions in the soil under the condition of reducing the artificial disturbance as much as possible or not under the condition of reducing the artificial disturbance as much as possible13CH4Abundance of the distribution.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a gas sample in-situ sampling device for solving the problems in the prior art.
In order to achieve the above and other related objects, one aspect of the present invention provides a gas sample in-situ sampling device, which includes a sampling tube and a sample storage tube; the sample storage tube is detachably covered on the sampling tube to form a sample storage inner cavity; the side wall of the sampling tube is provided with a hole opening part, and a gas exchange film layer matched with the hole opening part is arranged on the sample storage inner cavity side of the hole opening part; a metal punching mesh matched with the hole opening part is arranged on the outer side of the hole opening part, and a liquid-gas exchange cavity is formed between the gas exchange film layer and the metal punching mesh; store up the one end of keeping away from the sampling pipe on the appearance pipe and be equipped with the cock body, still include the gas suction tube, the gas suction tube is worn to locate in the inner chamber of storage appearance is located to cock body and at least part, one side that the appearance pipe was kept away from in the gas suction tube is equipped with the valve body.
In some embodiments of the present invention, the sampling tube and the sample storage tube are threadedly connected.
In some embodiments of the present invention, a first sealing member is disposed between the sampling tube and the sample storage tube.
In some embodiments of the present invention, the membrane edge of the gas exchange membrane layer is connected to the inner wall of the sample storage chamber through a second sealing member.
In some embodiments of the invention, the second sealing element is provided with an elastic compression ring on both sides.
In some embodiments of the present invention, the two ends of the liquid-gas exchange cavity contacting with the side wall of the sampling tube are respectively provided with a support bracket.
In some embodiments of the present invention, the mesh size of the metal punching mesh is 90 to 110 meshes.
In some embodiments of the invention, the first sealing member is selected from sealing rings.
In some embodiments of the present invention, the second sealing member is selected from a waterproof sealant patch.
In some embodiments of the invention, the plug body is an airtight plug.
In some embodiments of the invention, the gas suction tube is a silicone capillary tube.
In some embodiments of the present invention, the valve body is a gas three-way valve.
The utility model provides a paddy field soil CH4The gas sampling device can be used for sampling CH at different depths of the paddy field soil under the condition of not disturbing the soil profile4The gas is sampled in situ, the process is simple and convenient, the measurement is accurate, meanwhile, the artificial disturbance to a soil system is reduced to the maximum extent, and the reliability and the stability of sampling results are guaranteed under the conditions of different paddy field soil moisture.
Drawings
Fig. 1 shows a schematic structural diagram of the gas sample in-situ sampling device of the present invention.
Fig. 2 is a perspective view of a sampling tube structure in the gas sample in-situ sampling device according to the present invention.
Fig. 3 is a schematic view showing the sampling principle of the sampling tube in the gas sample in-situ sampling device of the present invention.
Fig. 4 is a diagram showing a state of the gas sample in-situ sampling device according to the present invention in the soil.
Reference numerals for elements in the figures
1 sample storage tube
2 sampling tube
3 sample storage cavity
4 opening part
5 gas exchange membrane layer
6 metal punching net
7 liquid-gas exchange cavity
8 plug body
9 gas suction pipe
10 valve body
11 first seal
12 second seal
13 elastic press ring
14 support bracket
15 soil
Detailed Description
In the description of the present invention, it should be noted that the structure, ratio, size, etc. shown in the attached drawings of the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by the people familiar with the technology, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention does not have the substantial technical significance, and the modification of any structure, the change of the ratio relationship or the adjustment of the size should still fall within the range that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that can be achieved. While the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like refer to orientations or positional relationships illustrated in the drawings, which are used for convenience in describing the invention and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1 to 3, an embodiment of the present invention relates to a gas sample in-situ sampling device, which includes a sampling tube 2 and a sample storage tube 1; the sample storage tube 1 is detachably covered on the sampling tube 2 to form a sample storage inner cavity 3; sampling tube 2's lateral wall is equipped with trompil portion 4, the 3 sides of the storage appearance inner chamber of trompil portion 4 are equipped with trompil portion 4 matched with gas exchange rete 5, because sampling tube 2's wall has certain thickness, consequently, the trompil portion 4 that forms also has certain thickness, and here gas exchange rete 5 specifically indicates that gas exchange rete 5 can cover the one side that trompil portion 4 lies in storage appearance inner chamber 3 side completely with the 3 side of the storage appearance inner chamber of trompil portion 4 cooperation. The outside of trompil portion 4 is equipped with the metal punched mesh 6 with trompil portion 4 complex, and here metal punched mesh 6 cooperatees with the outside of trompil portion 4 specifically means that metal punched mesh 6 can cover outside trompil portion 4 completelyOne side of the side. The aforementioned perforated part 4 has a certain thickness, so that a liquid-gas exchange cavity 7 can be formed between the gas exchange membrane layer 5 and the metal punched mesh 6. Store up the one end of keeping away from sampling pipe 2 on the appearance pipe 1 and be equipped with cock body 8, still include gaseous suction tube 9, gaseous suction tube 9 wears to locate in the sample inner chamber 3 is stored up to cock body 8 and at least part, one side that the appearance pipe 1 was kept away from to gaseous suction tube 9 is equipped with valve body 10. The utility model discloses a gas sample normal position sampling device can be applicable to paddy field soil CH4Gas sampling can be carried out on CH with different depths in the paddy field soil 15 under the condition of not disturbing the section of the soil 154The gas is sampled in situ, the process is simple and convenient, the measurement is accurate, meanwhile, the artificial disturbance to a soil system is reduced to the maximum extent, and the reliability and the stability of sampling results are guaranteed under the conditions of different paddy field soil moisture. Simultaneously, be equipped with consumptive materials such as gas exchange rete 5 in the trompil portion 4 in the sampling pipe, after consumptive materials such as gas exchange membrane reached life, because sampling pipe 2 and the setting dismantled of storing up appearance pipe 1 can only be with the part of abandoning sampling pipe 2, but store up appearance pipe 1 reuse.
The utility model provides an among the gas sample normal position sampling device, like figure 1, the bottom of sampling pipe 2 is the prong, is convenient for insert in soil 15. The material of the sampling tube 2 may be, for example, a metal material, and more specifically, a stainless steel material (304 stainless steel, etc.). Typically, the wall of the sampling tube 2 has a certain thickness, which may be, for example, 1.9-2.1 mm. The length of the sampling tube 2 is 4.9-5.1 cm, the inner diameter of the non-tip part of the sampling tube 2 is 1.4-1.6 cm, and the outer diameter is 1.7-2.0 cm. The sampling pipe 2 is used for soil 15 puncture and structure pressure bearing.
In the gas sample in-situ sampling device provided by the utility model, as shown in fig. 1, the material of the sample storage tube 1 can be, for example, a metal material, and more for example, a stainless steel material (304 stainless steel, etc.). The length of the sample storage tube 1 can be generally determined according to the size of the gas sampling amount, and the length of the sample storage tube 1 can be 10-25 cm. More for example, the length of the sample storage tube for 10ml of gas sampling amount under the atmospheric pressure condition should be selected to be 20cm in length. The inner diameter and the outer diameter of the sample storage tube 1 are respectively matched with the sampling tube 2, the inner diameter is 1.4-1.6 cm, and the outer diameter is 1.7-2.0 cm.
The utility model provides an among the gas sample normal position sampling device, as figure 1, threaded connection between sampling pipe 2 and the storage appearance pipe 1. Specifically, be equipped with the external screw thread on the sampling pipe 2, be equipped with the internal thread with external screw thread matched with on storing up sample pipe 1. For connecting the sampling tube 2 and the sample storage tube 1. More specifically, the sample storage tube 1 is tapped with the inner wall of 304 stainless steel, and the sampling tube 2 is tapped with the outer wall of 304 stainless steel, so that the sampling tube 2 can be screwed into the sample storage tube 1.
The utility model provides an among the gas sample normal position sampling device, as fig. 1 and 2, be equipped with first sealing member 11 between sampling pipe 2 and the storage appearance pipe 1. In an embodiment, the first seal 11 is selected from sealing rings. The sealing ring may be, for example, an impermeable silicone sealing ring. During the specific use, can be with prevention of seepage silica gel sealing ring nestification in sampling pipe 2 and store up threaded connection department between appearance pipe 1. The thickness of the sealing ring is 1.4-1.6 mm, and the inner diameter is 1.5-1.7 cm. The first seal 11 is used to prevent gas or liquid exchange at the interface of the sampling tube 2 and the sample storage tube 1.
The utility model provides an among the gas sample normal position sampling device, as figure 1 and 2, the lateral wall of sampling pipe 2 is equipped with trompil portion 4, and the size of trompil portion 4 can be 0.7 ~ 0.9cm 1.9 ~ 2.1cm for example.
The utility model provides an among the gas sample normal position sampling device, as fig. 1 and 2, the 3 sides of the storage appearance inner chamber of trompil portion 4 are equipped with and open the 4 matched with gas exchange rete 5 of portion. The membrane edge of the gas exchange membrane layer 5 is connected with the sample storage cavity 3 through a second sealing member 12. The material of the gas exchange membrane layer 5 may be, for example, an ePTFE gas exchange membrane. The second sealing member 12 may be a hydrophobic nonwoven substrate and more particularly may be a waterproof sealant patch, for example. The inner side of the ePTFE gas exchange membrane is planted on the hydrophobic non-woven fabric base. It can be understood that the outer edge of the ePTFE gas exchange membrane is tightly adhered to the inner wall of the sample storage cavity 3 by using an oval cloth-based waterproof sealant patch with an opening in the middle.
The utility model provides an among the gas sample normal position sampling device, as fig. 1 and 2, the both sides of second sealing member 12 are equipped with elastic compression ring 13. The elastic press ring 13 may be a spring press ring, for example. The spring pressing ring is made of C-shaped weather-resistant spring steel. May be closely fitted to the second sealing member 12 and disposed on the upper and lower sides of the second sealing member 12 (e.g., waterproof sealant patch) for compressing and supporting the second sealing member 12 (e.g., waterproof sealant patch).
The utility model provides an among the gas sample normal position sampling device, the outside of trompil portion 4 is equipped with and punches hole net 6 with trompil portion 4 matched with metal, and metal punches hole net 6 can be stainless steel and punches the hole net. The stainless steel perforated mesh may be welded to the sampling tube 2 outside the perforated portion 4. The mesh size of the metal punching mesh 6 is 90-110 meshes. To prevent large-particle silt in the soil 15 from damaging the gas exchange membrane 5. As shown in figure 3, in use, the dissolved CH in the water in the micropores of the soil 15 and the gaps between the soil 154The gas-liquid exchange membrane can firstly enter the liquid-gas exchange cavity 7 from the meshes of the metal punched mesh 6, and then enter the sample storage cavity 3 through the gas exchange membrane layer 5 to exchange or mix with nitrogen. And large-particle silt, water and the like in the soil do not pass through the gas exchange membrane layer 5, but return to the soil again through the meshes of the metal punched mesh 6.
The utility model provides an among the gas sample normal position sampling device, the both ends that the lateral wall of liquid gas exchange cavity 7 and sampling pipe 2 contacted are equipped with support bracket 14 respectively. The support bracket 14 can be a PE composite silica gel lining bracket, is made by adding plastic silica gel into the PE bracket and demoulding, is used for supporting a gap between the metal punching mesh 6 and the gas exchange film layer 5 to be used as a liquid-gas exchange cavity 7 (a liquid-gas two-phase exchange cavity), and is also used for preventing the body exchange film layer from generating overrun deformation when being pressed.
The utility model provides an among the gas sample normal position sampling device, cock body 8 can be for example the airtight stopper that stores up appearance inner chamber 3 usefulness.
In the gas sample in-situ sampling device provided by the utility model, the gas suction tube 9 can be a silica gel capillary tube, for example.
In the gas sample in-situ sampling device provided by the utility model, the valve body 10 can be a gas three-way valve, for example.
The utility model provides a gas sample normal position sampling device's working process:
in use, as shown in fig. 4, after the gas sample in-situ sampling device is assembled, before the gas sample in-situ sampling device is inserted into the paddy soil 15 to be measured, an inert gas, such as high-purity nitrogen (N), is injected through an injector connected to the valve body 10 (e.g., a gas three-way valve)2) Push into and store up kind inner chamber 3, will store up the inside original gas of kind inner chamber 3 and pass through the replacement of gas exchange rete 5 by the sampling pipe 2 lateral wall and go out. The original gas in the sample storage cavity 3 is completely filled with high-purity nitrogen (N)2) After the replacement is completed, the valve body 10 is closed in time. After further determining the sampling depth of the soil 15 gas, the soil is filled with high-purity nitrogen (N)2) The gas sample in-situ sampling device is timely inserted into the paddy soil 15 to a preset depth. The valve body 10 (e.g., gas three-way valve) is again opened and about 1/5 g of high purity N is drawn from the sample storage chamber 3 according to the selected cannula specification2After a negative pressure state is formed in the probe cavity, the valve body 10 is closed again. After the above operation is completed, as shown in fig. 3, the gas sample in-situ sampling device is placed in the paddy soil 15 for 1 hour to dissolve the dissolved CH in the water between the micropores of the soil 15 and the gaps between the soil 154High purity N with sample storage cavity 32And fully exchanging and mixing to obtain a mixed gas sample. After the gas sample in-situ sampling device is placed still, the mixed gas sample in the sample storage cavity 3 is extracted again through the injector and transferred to the vacuum glass gas cylinder for storage and subsequent use13CH4Abundance determination work. Due to CH4In a gas sample13CH4Abundance of (D) and CH in the gas sample4Independent of concentration, dependent only on CH4In12C and13c-atom abundance ratio, therefore, for the sample with less gas extraction in the sample storage cavity 3, high-purity N is required to be injected additionally2And (4) entering a glass gas sample bottle, and filling the gas volume in the bottle to 20 mL. The mixed gas sample is subjected to the gas sample by using an isotope mass spectrometer with the model of Thermo Scientific Delta V Plus13CH4The abundance was measured and the final measurement was obtained.
The utility model discloses the second aspect provides a methane (CH) for determining paddy field soil4) Gas (es)13A method of C abundance comprising the steps of:
1) and opening the valve body 10, completely replacing the original gas in the sample storage cavity 3 with inert gas through the gas exchange film layer 5, and closing the valve body 10. The inert gas may be, for example, high purity nitrogen.
2) Determining the sampling depth of the soil gas, and inserting the gas sample in-situ sampling device processed in the step 1) into the soil to a preset depth.
3) And opening the valve body 10, and extracting part of the inert gas from the sample storage cavity 3, wherein a negative pressure state is formed in the sample storage cavity 3 and the valve body 10 is arranged. Wherein part of the inert gas may be, for example, 1/5 nitrogen
4) The gas sample in-situ sampling device is placed in the soil for 0.9-1.1 h, so that the dissolved CH in the soil micropores and the soil interstitial water4And fully exchanging and mixing with the inert gas in the sample storage cavity 3 to obtain a mixed gas sample.
5) Extracting the mixed gas sample obtained in the step 4) from the sample storage cavity 3 through the valve body 10 to a vacuum glass gas sample bottle;
6) using isotope mass spectrometer to sample the vacuum glass gas in the bottle in step 5)13CH4The abundance was measured.
To sum up, the utility model provides a paddy field soil CH4The gas sampling device can be used for sampling CH at different depths of the paddy field soil under the condition of not disturbing the soil profile4The gas is sampled in situ, the process is simple and convenient, the measurement is accurate, meanwhile, the artificial disturbance to a soil system is reduced to the maximum extent, and the reliability and the stability of sampling results are guaranteed under the conditions of different paddy field soil moisture.
To sum up, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The in-situ sampling device for the gas sample is characterized by comprising a sampling pipe (2) and a sample storage pipe (1); the sample storage tube (1) is detachably covered on the sampling tube (2) to form a sample storage inner cavity (3); the side wall of the sampling tube (2) is provided with a hole opening part (4), and a gas exchange film layer (5) matched with the hole opening part (4) is arranged on the sample storage inner cavity side of the hole opening part (4); a metal punching mesh (6) matched with the hole opening part (4) is arranged on the outer side of the hole opening part (4), and a liquid-gas exchange cavity (7) is formed between the gas exchange film layer (5) and the metal punching mesh (6); store up the one end of keeping away from sampling pipe (2) on appearance pipe (1) and be equipped with cock body (8), still include gaseous suction tube (9), gaseous suction tube (9) are worn to locate in stopper body (8) and at least part are located and are stored up appearance inner chamber (3), one side that stores up appearance pipe (1) is kept away from in gaseous suction tube (9) is equipped with valve body (10).
2. The in-situ gas sample sampling device according to claim 1, wherein the sampling tube (2) and the sample storage tube (1) are threadedly connected.
3. The in-situ gas sample sampling device according to claim 1, wherein a first seal (11) is provided between the sampling tube (2) and the sample storage tube (1).
4. The in-situ gas sample sampling device according to claim 3, wherein the first seal (11) is selected from a sealing ring.
5. The in-situ sampling device for gas samples according to claim 1, characterized in that the membrane edge of the gas exchange membrane layer (5) is connected with the inner wall of the sample storage cavity (3) through a second sealing member (12).
6. The in-situ sampling device for gas samples according to claim 5, characterized in that the second sealing member (12) is provided with an elastic press ring (13) at both sides.
7. The in situ gas sample sampling device according to claim 5, wherein said second sealing member (12) is selected from the group consisting of a waterproof sealant patch.
8. The in-situ sampling device for the gas sample according to claim 1, wherein two ends of the liquid-gas exchange cavity (7) which are contacted with the side wall of the sampling tube (2) are respectively provided with a supporting bracket (14).
9. The in-situ sampling device for gas samples according to claim 1, characterized in that the mesh size of the metal punched mesh (6) is 90-110 mesh.
10. The in-situ sampling device of a gas sample according to claim 1, characterized in that said stopper body (8) is a gas-tight stopper;
and/or the gas suction pipe (9) is a silica gel capillary;
and/or the valve body (10) is a gas three-way valve.
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| CN202022548722.4U CN214794032U (en) | 2020-11-06 | 2020-11-06 | Gas sample in-situ sampling device |
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| CN202022548722.4U CN214794032U (en) | 2020-11-06 | 2020-11-06 | Gas sample in-situ sampling device |
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| CN214794032U true CN214794032U (en) | 2021-11-19 |
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