Soil volatile organic compound pretreatment device

Abstract

The utility model provides a soil volatile organic compound pretreatment device which comprises a sample bottle body, a gas inlet guide pipe, a gas outlet guide pipe, a dehydration pipe body and a collection pipe body, and the sample bottle body, the gas inlet guide pipe, the gas outlet guide pipe, the dehydration pipe body and the collection pipe body are relatively small in size and easy to carry and assemble. The pretreatment device for the volatile organic compounds in the soil can be synchronously erected, an extracted soil sample is directly placed in the sample bottle body, and carrier gas is introduced into the sample bottle body through an external gas cylinder of the gas inlet guide pipe, so that the volatile organic compounds in the soil sample can be collected in the collection pipe body; the collection tube body only needs to be transferred to a laboratory to complete corresponding detection subsequently, so that the convenience of detecting the volatile organic compounds in the soil is effectively improved.

Description

Technical Field

[0001] This application belongs to the technical field of soil detection, and more specifically, relates to a pretreatment device for soil volatile organic compounds. Background Art

[0002] Volatile Organic Compounds (VOCs) refer to organic compounds that have a relatively high saturated vapor pressure (greater than 13.33 Pa), low boiling point, small molecular weight, and are easily volatile at normal temperature under standard conditions. Commonly, there are eight categories including alkanes, aromatic hydrocarbons, hydrocarbons, halogenated hydrocarbons, esters, aldehydes, ketones, and other compounds.

[0003] Volatile organic compounds in soil can directly damage the normal functions of the soil, and enter the human body directly through the absorption of animals and plants and the food chain, thereby affecting the normal biochemical and physiological reactions of the human body, as well as the metabolism, development, and reproductive functions of the human body, and causing damage to the human nervous system and endocrine system.

[0004] Currently, during the detection of soil volatile organic compounds, the pretreatment operations for soil samples are mainly completed by purge and trap and static headspace samplers used in conjunction with testing instruments. However, the above-mentioned pretreatment equipment is costly and has poor portability. It usually needs to be installed in a laboratory and used in coordination with testing instruments, so that the soil samples extracted in the detection area need to be stored in a sealed manner and transferred to the laboratory for pretreatment operations, thereby affecting the convenience of soil volatile organic compound detection. Summary of the Utility Model

[0005] The purpose of this application is to provide a pretreatment device for soil volatile organic compounds, aiming to solve the problem that the purge and trap and static headspace samplers currently used for pretreatment operations on soil samples are costly and have poor portability, resulting in the need to store the soil samples extracted in the detection area in a sealed manner and transfer them to the laboratory for pretreatment operations, thereby affecting the convenience of soil volatile organic compound detection.

[0006] To achieve the above purpose, the technical solution adopted in this application is to provide a pretreatment device for soil volatile organic compounds, including a sample bottle body, an intake conduit, an outlet conduit, a dehydration pipe body, and a collection pipe body. The sample bottle body is provided with a carrier gas inlet and a carrier gas outlet. The intake conduit passes through the carrier gas inlet and communicates with the inside of the sample bottle body. The outlet conduit passes through the carrier gas outlet and communicates with the inside of the sample bottle body, and the outlet conduit extends out of the sample bottle body and sequentially communicates with the dehydration pipe body and the collection pipe body.

[0007] In one embodiment, a sealing cap is hermetically connected to the top opening of the sample bottle body, and both the carrier gas inlet and the carrier gas outlet are provided on the sealing cap.

[0008] In one embodiment, the soil volatile organic compound pretreatment device further includes a heating base for supporting and heating the sample bottle body.

[0009] In one embodiment, a circular concave platform for limiting and fixing the sample bottle body is provided at the top of the heating base. An annular groove is provided at the bottom of the circular concave platform, and a heating coil is provided in the annular groove. A temperature sensor is centrally protruded on the circular concave platform, and an avoidance groove for accommodating the temperature sensor is provided at the center of the outer wall of the bottom of the sample bottle body.

[0010] In one embodiment, the intake duct includes a first pipe body located outside the sample bottle body, and a second pipe body and a third pipe body located inside the sample bottle body. The first pipe body is inserted through the carrier gas inlet, and the first pipe body, the second pipe body, and the third pipe body are sequentially connected. A pressure regulating valve is provided on the first pipe body. The second pipe body extends in the vertical direction, and the third pipe body extends in the horizontal direction.

[0011] In one embodiment, the soil volatile organic compound pretreatment device further includes a verification pipe body. The outlet duct extends out of the sample bottle body and is sequentially connected to a dehydration pipe body, a collection pipe body, and the verification pipe body.

[0012] In one embodiment, the outlet duct includes a fourth pipe body, a fifth pipe body, and a sixth pipe body. The fourth pipe body is inserted through the carrier gas outlet and is connected between the sample bottle body and the dehydration pipe body. The fifth pipe body is connected between the dehydration pipe body and the collection pipe body. The sixth pipe body is connected between the collection pipe body and the verification pipe body.

[0013] In one embodiment, both the dehydration pipe body, the collection pipe body, and the verification pipe body are open at both ends. One end of the fourth pipe body is sleeved with a first soft leather sleeve, and the fourth pipe body is sleeved and connected to the corresponding end of the dehydration pipe body through the first soft leather sleeve. Both ends of the fifth pipe body are respectively sleeved with second soft leather sleeves, and the fifth sleeve is sleeved and connected to the corresponding end of the dehydration pipe body and the corresponding end of the collection pipe body respectively through each second soft leather sleeve. Both ends of the sixth pipe body are respectively sleeved with third soft leather sleeves, and the sixth pipe body is sleeved and connected to the corresponding end of the collection pipe body and the corresponding end of the verification pipe body respectively through each third soft leather sleeve.

[0014] In one embodiment, a porous support ring layer is annularly provided on the inner wall of the dehydration pipe body, and a lithium chloride coating is provided on the inner wall of the porous support ring layer.

[0015] In one embodiment, the same collection and adsorption material is filled in both the collection pipe body and the verification pipe body.

[0016] The beneficial effects of the soil volatile organic compound pretreatment device provided by the present application are as follows. Compared with the prior art, the above-mentioned soil volatile organic compound pretreatment device includes a sample bottle body, an intake air duct, an exhaust air duct, a dehydration pipe body and a collection pipe body. Among them, the sample bottle body is provided with a carrier gas inlet and a carrier gas outlet. The intake air duct passes through the carrier gas inlet and communicates with the inside of the sample bottle body. The exhaust air duct passes through the carrier gas outlet and communicates with the inside of the sample bottle body. And the exhaust air duct extends out of the sample bottle and is sequentially connected to the dehydration pipe body and the collection pipe body. Since the sample bottle body, the intake air duct, the exhaust air duct, the dehydration pipe body and the collection pipe body are all relatively small in volume and easy to carry and assemble, during the process of extracting soil samples in the wild, the above-mentioned soil volatile organic compound pretreatment device can be erected synchronously. Then, the extracted soil sample can be directly placed in the sample bottle body, and a carrier gas can be introduced into the sample bottle body through the intake air duct connected to a gas cylinder outside. That is, the collection operation of volatile organic compounds in the soil sample can be completed in the collection pipe body. Subsequently, only the collection pipe body needs to be transferred to the laboratory to complete the corresponding detection, effectively improving the convenience of detecting soil volatile organic compounds. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the prior art descriptions. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic assembly structure diagram of the soil volatile organic compound pretreatment device provided by an embodiment of the present application;

[0019] Figure 2 is Figure 1 a schematic connection structure diagram of the heating base and the sample bottle body in the shown soil volatile organic compound pretreatment device;

[0020] Figure 3 is Figure 2 a top view structure diagram of the shown heating base.

[0021] In the figure: 10, a pretreatment device for soil volatile organic compounds; 100, a sample bottle body; 102, an avoidance groove; 110, a sealing bottle cap; 112, a carrier gas inlet; 114, a carrier gas outlet; 200, an intake conduit; 210, a first pipe body; 212, a pressure regulating valve; 220, a second pipe body; 230, a third pipe body; 300, an exhaust conduit; 310, a fourth pipe body; 312, a first soft leather sleeve; 320, a fifth pipe body; 322, a second soft leather sleeve; 330, a sixth pipe body; 332, a third soft leather sleeve; 400, a dehydration pipe body; 500, a collection pipe body; 600, a verification pipe body; 700, a heating base; 710, a circular concave platform; 712, an annular groove; 714, a heating coil; 800, a temperature sensor. Detailed implementation manners

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0023] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0024] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0025] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0026] Please refer to Figure 1, an embodiment of the present application will now be described for the soil volatile organic compound pretreatment device 10. The soil volatile organic compound pretreatment device 10 includes a sample bottle body 100, an intake duct 200, an exhaust duct 300, a dehydration pipe body 400, and a collection pipe body 500. Among them, the sample bottle body 100 is used to store soil samples (not shown in the figure). The sample bottle body 100 is provided with a carrier gas inlet 112 and a carrier gas outlet 114. The intake duct 200 is penetrated through the carrier gas inlet 112 and communicates with the inside of the sample bottle body 100. The exhaust duct 300 is penetrated through the carrier gas outlet 114 and communicates with the inside of the sample bottle body 100. And the exhaust duct 300 extends out of the sample bottle body 100 and sequentially communicates with the dehydration pipe body 400 and the collection pipe body 500. It should be noted that the intake duct 200 is used to externally connect a 4L gas cylinder filled with carrier gas (not shown in the figure), so that the carrier gas can enter the sample bottle body 100 through the intake duct 200 and react with the volatile organic compounds in the soil sample in the sample bottle body 100, and then be adsorbed and collected by the collection pipe body 500 after dehydration treatment by the dehydration pipe body 400.

[0027] The beneficial effect of the soil volatile organic compound pretreatment device 10 provided by the present application is that, compared with the prior art, in the soil volatile organic compound pretreatment device 10, since the sample bottle body 100, the intake duct 200, the exhaust duct 300, the dehydration pipe body 400, and the collection pipe body 500 are all relatively small in volume and easy to carry and assemble, during the process of extracting soil samples in the wild, the above-mentioned soil volatile organic compound pretreatment device 10 can be erected synchronously. Then, the extracted soil sample can be directly placed in the sample bottle body 100, and a gas cylinder is externally connected to the intake duct 200 to introduce carrier gas into the sample bottle body 100. That is, the collection operation of the volatile organic compounds in the soil sample can be completed in the collection pipe body 500. Subsequently, only the collection pipe body 500 needs to be transferred to the laboratory to complete the corresponding detection, effectively improving the convenience of detecting soil volatile organic compounds.

[0028] Furthermore, in this embodiment, a sealing cap 110 is hermetically connected to the top bottle mouth of the sample bottle body 100. Both the carrier gas inlet 112 and the carrier gas outlet 114 are provided on the sealing cap 110. Further, the sealing cap 110 is threadedly connected or inserted into the sample bottle body 100. By opening the sealing cap 110, the soil sample can be put into the sample bottle body 100 or taken out of the sample bottle body 100. And the sample bottle body 100 is a borosilicate glass round bottle with a radius of 4 cm and a height of 6 cm, and the sealing cap 110 is made of Teflon material.

[0029] Further, in this embodiment, the intake duct 200 includes a first tube body 210 located outside the sample bottle body 100, and a second tube body 220 and a third tube body 230 located inside the sample bottle body 100. The first tube body 210 is inserted through the carrier gas inlet 112, and the first tube body 210, the second tube body 220, and the third tube body 230 are integrally formed and connected in sequence. The first tube body 210 is provided with a pressure regulating valve 212, and the pressure regulating valve 212 is used to adjust the carrier gas flow rate introduced from an external gas cylinder into the sample bottle body 100. The second tube body 220 extends vertically towards the inner bottom wall of the sample bottle body 100, and the third tube body 230 extends horizontally towards the inner side wall of the sample bottle body 100. The vertical extension of the second tube body 220 makes the third tube body 230 relatively closer to the soil sample located on the inner bottom wall of the sample bottle body 100, and the horizontal extension of the third tube body 230 makes the carrier gas blown out from the end of the third tube body 230 away from the second tube body 220 not directly blow the soil sample located on the inner bottom wall of the sample bottle body 100, preventing dust from rising. Further, the first tube body 210, the second tube body 220, and the third tube body 230 are all Teflon tubes with an inner diameter of 4 mm.

[0030] Further, in this embodiment, the soil volatile organic compound pretreatment device 10 further includes a verification tube body 600. The corresponding outlet duct 300 extends out of the sample bottle body 100 and is connected in sequence to a dehydration tube body 400, a collection tube body 500, and the verification tube body 600. After completing the pretreatment operation of the soil sample, the collection tube body 500 and the verification tube body 600 are stored and transferred to the laboratory together. The verification tube body 600 is used to determine whether the volatile organic compounds in the corresponding soil sample are completely collected.

[0031] Further, in this embodiment, the outlet duct 300 includes a fourth tube body 310, a fifth tube body 320, and a sixth tube body 330. Among them, the fourth tube body 310 is inserted through the carrier gas outlet 114, and the fourth tube body 310 is connected between the sample bottle body 100 and the dehydration tube body 400. The fifth tube body 320 is connected between the dehydration tube body 400 and the collection tube body 500. The sixth tube body 330 is connected between the collection tube body 500 and the verification tube body 600.

[0032] Furthermore, in this embodiment, connection openings (not shown in the figure) are convexly provided at both ends of the above-mentioned dehydrating pipe body 400, collecting pipe body 500, and verification pipe body 600. One end of the fourth pipe body 310 is sleeved with a first soft leather sleeve 312, and the fourth pipe body 310 is sleeved and communicated with the connection opening at the corresponding end of the dehydrating pipe body 400 through the first soft leather sleeve 312. Opposite ends of the fifth pipe body 320 are respectively sleeved with second soft leather sleeves 322, and the fifth pipe body 320 is sleeved and communicated with the connection opening at the corresponding end of the dehydrating pipe body 400 and the connection opening at the corresponding end of the collecting pipe body 500 through the respective second soft leather sleeves 322. Opposite ends of the sixth pipe body 330 are respectively sleeved with third soft leather sleeves 332, and the sixth pipe body 330 is sleeved and communicated with the connection opening at the corresponding end of the collecting pipe body 500 and the connection opening at the corresponding end of the verification pipe body 600 through the respective third soft leather sleeves 332. It should be noted that by sleeving the first soft leather sleeve 312, second soft leather sleeves 322, and third soft leather sleeves 332 on the fourth pipe body 310, fifth pipe body 320, and sixth pipe body 330 respectively, it can effectively prevent collision and wear between adjacent connected pipe bodies, and it is also convenient for the plugging and disassembly of adjacent connected pipe bodies.

[0033] Specifically, in this embodiment, the above-mentioned fourth pipe body 310, fifth pipe body 320, and sixth pipe body 330 are all Teflon pipes with an inner diameter of 4 mm. The lengths of the dehydrating pipe body 400, collecting pipe body 500, and verification pipe body 600 after removing the connection openings are 8 cm, and the inner diameter is 6 cm.

[0034] Specifically, in this embodiment, a porous support ring layer (not shown in the figure) is annularly provided on the inner wall of the above-mentioned dehydrating pipe body 400, and a lithium chloride coating (not shown in the figure) is provided on the inner wall of the porous support ring layer. Among them, the porous support ring layer can be silica gel, and the cooperation of the porous support ring layer and the lithium chloride coating has a good water absorption effect. The collecting pipe body 500 and the verification pipe body 600 are the same activated carbon pipes or thermal desorption pipes, that is, the same collecting and adsorbing materials are filled inside the collecting pipe body 500 and the verification pipe body 600.

[0035] Please refer to Figure 2 and Figure 3 , in this embodiment, the above-mentioned soil volatile organic compound pretreatment device 10 further includes a heating base 700, and the heating base 700 is used to support and fix the sample bottle body 100 and heat the soil sample located in the sample bottle body 100, thereby improving the separation speed of volatile organic compounds from the soil sample and improving the operation efficiency.

[0036] Furthermore, in this embodiment, a circular concave platform 710 adapted to the structural dimensions of the sample bottle body 100 and used to limit and fix the sample bottle body 100 is provided at the top of the heating base 700, so that the bottom of the sample bottle body 100 is limited and fixed on the circular concave platform 710. An annular groove 712 is coaxially provided on the bottom surface of the circular concave platform 710, a heating coil 714 is provided in the annular groove 712, and a temperature sensor 800 protrudes from the center of the circular concave platform 710. A relief groove 102 for accommodating the temperature sensor 800 is provided at the center of the outer wall of the bottom of the sample bottle body 100. The temperature sensor 800 is used to monitor the temperature environment inside the sample bottle body 100, and a mobile power supply (not shown) and a control main board (not shown) electrically connected to the heating coil 714 and the temperature sensor 800 are further provided inside the heating base 700.

[0037] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A soil volatile organic compound pretreatment device, characterized in that: The invention comprises a sample bottle body, an air inlet duct, an air outlet duct, a dehydration tube body and a collection tube body. The sample bottle body is provided with a carrier gas inlet and a carrier gas outlet. The air inlet duct is passed through the carrier gas inlet and connected to the interior of the sample bottle body. The air outlet duct is passed through the carrier gas outlet and connected to the interior of the sample bottle body. The air outlet duct extends out of the sample bottle body and sequentially connects to the dehydration tube body and the collection tube body.

2. The soil volatile organic compound pretreatment device according to claim 1, characterized in that: A sealing bottle cap is sealed at the bottle mouth on the top of the sample bottle body, and the carrier gas inlet and the carrier gas outlet are both opened on the sealing bottle cap.

3. The soil volatile organic compound pretreatment device according to claim 2, characterized in that: The soil volatile organic compound pretreatment device also includes a heating base, and the heating base is used to support and heat the sample bottle.

4. The soil volatile organic compound pretreatment device according to claim 3, characterized in that: A circular recess is provided on the top of the heating base for limiting and fixing the sample bottle body, an annular groove is provided at the bottom of the circular recess, a heating coil is provided in the annular groove, and a temperature sensor is convexly provided at the center of the circular recess, and an avoidance groove for accommodating the temperature sensor is provided at the center of the outer wall of the bottom of the sample bottle body.

5. The soil volatile organic compound pretreatment device according to claim 2, characterized in that: The air inlet duct includes a first tube body located outside the sample bottle body, and a second tube body and a third tube body located inside the sample bottle body, the first tube body is penetrated through the carrier gas inlet, and the first tube body, the second tube body and the third tube body are connected in sequence, and the first tube body is provided with a pressure regulating valve, the second tube body extends in a vertical direction, and the third tube body extends in a horizontal direction.

6. The soil volatile organic compound pretreatment device according to claim 2, characterized in that: The soil volatile organic compound pretreatment device also includes a verification tube body, and the air outlet conduit extends out of the sample bottle body and is sequentially connected to the dehydration tube body, the collection tube body and the verification tube body.

7. The soil volatile organic compound pretreatment device according to claim 6, characterized in that: The gas outlet duct includes a fourth tube body, a fifth tube body and a sixth tube body. The fourth tube body is passed through the carrier gas outlet and connected between the sample bottle body and the dehydration tube body, the fifth tube body is connected between the dehydration tube body and the collection tube body, and the sixth tube body is connected between the collection tube body and the verification tube body.

8. The soil volatile organic compound pretreatment device according to claim 7, characterized in that: The dehydration tube body, the collection tube body and the verification tube body are all opened at both ends; one end of the fourth tube body is sleeved with a first soft leather sleeve, and the fourth tube body is sleeved and connected to a corresponding end of the dehydration tube body through the first soft leather sleeve; two ends of the fifth tube body are respectively sleeved with second soft leather sleeves, and the fifth tube body is respectively sleeved and connected to a corresponding end of the dehydration tube body and a corresponding end of the collection tube body through the second soft leather sleeves; two ends of the sixth tube body are respectively sleeved with third soft leather sleeves, and the sixth tube body is respectively sleeved and connected to a corresponding end of the collection tube body and a corresponding end of the verification tube body through the third soft leather sleeves.

9. The soil volatile organic compound pretreatment device according to claim 6, characterized in that: The inner wall of the dehydration tube body is provided with a porous support ring layer, and the inner wall of the porous support ring layer is provided with a lithium chloride coating.

10. The soil volatile organic compound pretreatment device according to claim 6, characterized in that: The collection tube body and the verification tube body are both filled with the same collection adsorption material.

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