An experimental device for simulating the migration of microplastics in soil

Abstract

The utility model relates to micro plastic migration technical field especially for a kind of experimental device simulating micro plastic migration in soil, including the experimental cylinder and sample cylinder of vertical arrangement;The experimental cylinder includes the first cylinder body of being sequentially stacked in vertical direction, and the inner bottom of the first cylinder body is fixed with support net;The inside of each first cylinder body is filled with soil layer;The diameter of the sample cylinder is less than the diameter of experimental cylinder, and the sample cylinder is inserted into the soil layer from the top middle part of the experimental cylinder;The inside of sample cylinder is sequentially provided with micro plastic layer and coarse sand layer from bottom to top. The utility model is divided into multiple first cylinder body by experimental cylinder, when filling soil actually, can first fill every first cylinder body with soil respectively, then multiple first cylinder body filled with soil is stacked according to certain order, so it can improve the filling speed of soil layer, and can significantly improve the accuracy of experimental result.

Description

Technical Field

[0001] This utility model relates to the field of microplastic migration technology, specifically an experimental device for simulating the migration of microplastics in soil. Background Technology

[0002] Microplastics can migrate through soil pores with water flow, especially under irrigation or rainfall conditions. The particle size, shape, and density of microplastics all affect their migration ability in soil. Generally, smaller, irregularly shaped microplastics migrate more easily.

[0003] By tracking the vertical migration of microplastics in soil profiles, we can assess their potential to contaminate groundwater or enter deeper soil layers. For example, long-term field experiments can reveal the depth and accumulation of microplastics as they migrate downwards with irrigation water.

[0004] Chinese utility model patent CN210071813U discloses an experimental apparatus for simulating the migration of microplastics in soil, comprising: a drainage box having a drainage outlet; and an experimental component disposed in the drainage box, the experimental component including an experimental tube disposed in the drainage box and quartz wool located at the bottom of the experimental tube, the experimental tube also being used to carry sand and microplastics located above the sand; an experimental solution is injected into the experimental tube from the top to simulate the migration path of microplastics in soil.

[0005] While the aforementioned patents can simulate the migration of microplastics in soil, facilitating the acquisition of experimental data on microplastic migration in soil and providing a theoretical basis for practical applications, the experimental device for simulating microplastic migration in soil of this invention also features a simple structure, ease of experimental operation, recyclability, and low cost.

[0006] However, the following shortcomings still exist in the use of this technology: First, in the test, the microplastic layer and the soil layer have the same diameter. Once there is a gap between the soil layer and the test tube, the microplastic will leak directly to the bottom of the test tube under the action of water flow, resulting in inaccurate experimental results. Second, the current experimental device is relatively troublesome to fill with soil, especially for multi-layered soil, which wastes a lot of time during filling. Utility Model Content

[0007] The purpose of this invention is to provide an experimental device for simulating the migration of microplastics in soil, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] An experimental apparatus for simulating the migration of microplastics in soil includes a vertically arranged experimental tube and a sample tube;

[0010] The experimental tube includes several first tubes stacked in sequence along the vertical direction, and a support net is fixed to the inner bottom of the first tube;

[0011] Each of the first cylinders is filled with a soil layer;

[0012] The diameter of the sample tube is smaller than the diameter of the experimental tube, and the sample tube is inserted into the soil layer from the middle part of the top of the experimental tube;

[0013] The sample tube contains a microplastic layer and a coarse sand layer arranged sequentially from bottom to top, and the mesh diameter of the support mesh is larger than the particle size of the microplastics in the microplastic layer.

[0014] Preferably, a plurality of connecting pieces are fixed at equal intervals on the outer periphery of the first cylinder, and an annular handle is sleeved and fixed on the outer side of the plurality of connecting pieces.

[0015] Preferably, the top of the connecting piece protrudes from the top of the corresponding first cylinder and forms a positioning part, and a plurality of positioning parts cooperate to enable two adjacent first cylinders to be coaxially connected.

[0016] Preferably, the top of the positioning part is formed with a slope.

[0017] Preferably, the sample tube includes a second tube body and a reinforcing ring, wherein the reinforcing ring is integrally disposed on the top of the second tube body.

[0018] Preferably, the sample tube further includes a cutting edge, which is disposed at the bottom of the sample tube.

[0019] Preferably, it also includes a positioning frame, the positioning frame comprising an inner ring, an outer ring, and a connecting rod fixed between the inner ring and the outer ring;

[0020] The second cylinder passes through the inner ring and is partially inserted into the soil layer.

[0021] Preferably, a stop ring is fixed on the outer circumferential surface of the second cylinder, and the outer diameter of the stop ring is larger than the inner diameter of the inner ring.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] This invention divides the experimental tube into multiple first cylinders. During actual soil filling, each first cylinder can be filled with soil first, and then the multiple soil-filled first cylinders can be stacked in a specific order. This increases the soil filling speed and allows for the creation of multiple soil layers with different structures, such as mud layers and sand layers, to more realistically simulate soil structures in different regions, thus expanding the applicability of the experimental device. Furthermore, because the diameter of the sample cylinder is smaller than that of the experimental tube, and the sample cylinder is inserted into the soil layer from the top middle part of the experimental tube, it ensures that microplastics will not migrate along the gap between the experimental tube and the soil layer, significantly improving the accuracy of the experimental results. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is a schematic cross-sectional view of the overall structure of this utility model;

[0026] Figure 3 This is a cross-sectional view of the sample tube of this utility model;

[0027] Figure 4 This is a schematic diagram of the positioning frame of this utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the first cylindrical body of this utility model;

[0029] Figure 6 This utility model Figure 5 Enlarged structural diagram at point A in the middle.

[0030] In the diagram: 1. Experimental tube; 11. First tube body; 12. Handle; 13. Connecting piece; 131. Positioning part; 132. Inclined surface; 14. Support net; 2. Sample tube; 21. Second tube body; 22. Blade edge; 23. Stop ring; 24. Reinforcing ring; 3. Positioning frame; 31. Inner ring; 32. Outer ring; 33. Connecting rod; 4. Soil layer; 5. Coarse sand layer; 6. Microplastic layer. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Please see Figures 1-6 This utility model provides a technical solution:

[0033] An experimental apparatus for simulating the migration of microplastics in soil includes a vertically arranged experimental cylinder 1 and a sample cylinder 2; wherein, the experimental cylinder 1 is used to load a soil layer 4, and the sample cylinder 2 has a microplastic layer 6 and a coarse sand layer 5 arranged sequentially from bottom to top inside; the specific materials of the experimental cylinder 1 and the sample cylinder 2 are not limited here, and can be made of stainless steel.

[0034] The function of the coarse sand layer 5 is to press the microplastic layer 6. In some embodiments, the particle size of the coarse sand layer 5 is 1-2 mm and the height of the coarse sand layer 5 is about 4 cm. Of course, the particle size and height of the coarse sand layer 5 can be adjusted adaptively for different situations.

[0035] The experimental cylinder 1 includes several first cylinders 11 stacked vertically. The specific number of first cylinders 11 is not limited here; for example, it can be four as shown in the figure, or it can be adjusted according to the actual situation. Each first cylinder 11 is filled with a soil layer 4. A support net 14 is fixed to the bottom of the inner part of the first cylinder 11. The support net 14 is used to support the soil layer 4 so that it does not leak from the bottom of the first cylinder 11, thus ensuring the integrity of the soil layer 4. This ensures that the connection between the multiple soil layers 4 is tight after the multiple first cylinders 11 are stacked. Furthermore, the mesh diameter of the support net 14 is larger than the particle size of the microplastics in the microplastic layer 6 to avoid the support net 14 obstructing the migration of the microplastics.

[0036] In the above scheme, by dividing the experimental cylinder 1 into multiple first cylinders 11, when actually filling the soil, the soil can be filled into each first cylinder 11 firstly, and then the multiple first cylinders 11 filled with soil can be stacked in a certain order. This can improve the filling speed of the soil layer 4 and also make it easier to set the soil layer 4 into multiple different structures, such as mud layer, sand layer, etc., which can more realistically simulate the soil structure of different regions and expand the applicability of the experimental device.

[0037] Furthermore, the diameter of sample tube 2 is smaller than that of experimental tube 1, and sample tube 2 is inserted into soil layer 4 from the top middle part of experimental tube 1; this ensures that microplastics will not migrate along the gap between experimental tube 1 and soil layer 4, significantly improving the accuracy of experimental results; since the diameter of sample tube 2 is smaller than that of experimental tube 1, more soil can be filled inside experimental tube 1, increasing its weight, but since experimental tube 1 is divided into multiple first tubes 11 in this technical solution, there will be no situation where experimental tube 1 is too heavy to move; at the same time, after the migration experiment is completed, the staff can also remove the multiple first tubes 11 one by one for observation, which makes it easier to determine the migration of microplastics.

[0038] In some embodiments, a plurality of connecting pieces 13 are fixed at equal intervals on the outer periphery of the first cylinder 11, and an annular handle 12 is sleeved and fixed on the outer side of the plurality of connecting pieces 13. The handle 12, together with the connecting pieces 13, can improve the structural strength of the first cylinder 11, so that it can always maintain a cylindrical structure when subjected to force, and can also be used to move the first cylinder 11, which facilitates the work of the staff.

[0039] To ensure complete alignment of two adjacent first cylinders 11 and prevent soil leakage from the joint between them, the top of the connecting piece 13 protrudes from the top of its corresponding first cylinder 11 and forms a positioning part 131. Several positioning parts 131 cooperate to enable coaxial docking of two adjacent first cylinders 11. Specifically, several positioning parts 131 are arranged in a ring around the axis of the first cylinder 11, forming a circular insertion space between them. The bottom of the previous first cylinder 11 can be directly inserted into the insertion space at the top of the next first cylinder 11, thereby achieving coaxial docking between the two first cylinders 11. In addition, since the handle 12, in conjunction with the connecting piece 13, keeps the first cylinder 11 in a cylindrical shape, this also provides a basis for coaxial docking between the two first cylinders 11. The top of the positioning part 131 has a slope 132. From an overall perspective, the circular insertion space formed between several positioning parts 131 is a conical structure with a large top diameter and a small bottom diameter, which makes it easier to directly insert the bottom of the previous first cylinder 11 into the insertion space at the top of the next first cylinder 11.

[0040] The sample tube 2 includes a second tube body 21 and a reinforcing ring 24. The reinforcing ring 24 is integrally set on the top of the second tube body 21. The setting of the reinforcing ring 24 can reduce the pressure between the palm of the worker and the top of the second tube body 21, making it easier for the worker to insert the bottom of the second tube body 21 into the soil layer 4 by pressing.

[0041] Furthermore, the sample tube 2 also includes a cutting edge 22, which is located at the bottom of the sample tube 2. The presence of the cutting edge 22 allows the bottom of the second tube 21 to be inserted more smoothly into the soil layer 4.

[0042] The experimental apparatus further includes a positioning frame 3, which is used to position the second cylinder 21 so that it is as coaxial as possible with the first cylinder 11. The positioning frame 3 includes an inner ring 31, an outer ring 32, and a connecting rod 33 fixed between the inner ring 31 and the outer ring 32. The outer ring 32 can be inserted into a circular insertion space formed between several positioning parts 131 to achieve coaxial setting between the outer ring 32 and the first cylinder 11. The second cylinder 21 is inserted into the soil layer 4 after passing through the inner ring 31. In order to control the depth of the bottom of the second cylinder 21 inserted into the soil layer 4, and the presence of the cutting edge 22 also provides convenience for the second cylinder 21 to be inserted through the inner ring 31, in this embodiment, a stop ring 23 is fixed on the outer circumferential surface of the second cylinder 21. The outer diameter of the stop ring 23 is larger than the inner diameter of the inner ring 31.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An experimental device for simulating the migration of microplastics in soil, characterized in that, This includes vertically arranged experimental tubes and sample tubes; The experimental tube includes several first tubes stacked in sequence along the vertical direction, and a support net is fixed to the inner bottom of the first tube; Each of the first cylinders is filled with a soil layer; The diameter of the sample tube is smaller than the diameter of the experimental tube, and the sample tube is inserted into the soil layer from the middle part of the top of the experimental tube; The sample tube contains a microplastic layer and a coarse sand layer arranged sequentially from bottom to top, and the mesh diameter of the support mesh is larger than the particle size of the microplastics in the microplastic layer.

2. The experimental device for simulating the migration of microplastics in soil according to claim 1, characterized in that, A plurality of connecting pieces are fixed at equal intervals on the outer periphery of the first cylinder, and an annular handle is sleeved and fixed on the outer side of the plurality of connecting pieces.

3. The experimental device for simulating the migration of microplastics in soil according to claim 2, characterized in that, The top of the connecting piece protrudes from the top of the corresponding first cylinder and forms a positioning part. Several positioning parts cooperate to enable two adjacent first cylinders to be coaxially connected.

4. The experimental device for simulating the migration of microplastics in soil according to claim 3, characterized in that, The top of the positioning part has a slope.

5. The experimental device for simulating the migration of microplastics in soil according to claim 1, characterized in that, The sample tube includes a second tube body and a reinforcing ring, wherein the reinforcing ring is integrally disposed on the top of the second tube body.

6. The experimental apparatus for simulating the migration of microplastics in soil according to claim 5, characterized in that, The sample tube also includes a cutting edge, which is located at the bottom of the sample tube.

7. The experimental device for simulating the migration of microplastics in soil according to claim 5, characterized in that, It also includes a positioning frame, which includes an inner ring, an outer ring, and a connecting rod fixed between the inner ring and the outer ring; The second cylinder passes through the inner ring and is partially inserted into the soil layer.

8. The experimental device for simulating the migration of microplastics in soil according to claim 7, characterized in that, A stop ring is fixed to the outer circumferential surface of the second cylinder, and the outer diameter of the stop ring is larger than the inner diameter of the inner ring.

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