Passive sampler for micro-plastics in natural water body

Abstract

The utility model relates to the field of sampler devices, and discloses a passive sampler for natural water body micro-plastics, which comprises an air bag and a shell, the shell is arranged at the bottom end of the air bag, one side of the air bag is fixedly connected with a connecting pipe, the other end of the connecting pipe is in threaded connection with a cover, the bottom end of the air bag is fixedly connected with two sleeves, and the two sleeves are in threaded connection with the air bag. A metal filter screen is fixedly connected to the side, close to the first filter screen, of the inner side wall of the shell, a second filter screen and a third filter screen are arranged in the shell, polycarbonate filter membranes with different pore diameters are arranged in the shell, the particle size of micro-plastic in water flowing through the device is effectively graded, and the workload of indoor micro-plastic detection is greatly reduced. According to the passive sampler disclosed by the utility model, the sampler is prevented from sinking to the bottom by arranging the air bag, and meanwhile, the flowmeter is arranged in the shell, so that the water flow of a water area is effectively calculated, and micro-plastics in water can be subjected to particle size grading collection.

Description

Technical Field

[0001] The utility model relates to the field of sampler devices, in particular to a passive sampler for microplastics in natural waters. Background Art

[0002] Most plastic wastes are stable long-chain polymer molecules, which are not easily degraded in the natural environment. However, they can be broken into tiny plastic particles under the action of light, tides, temperature differences, or wind erosion, etc., which are called microplastic wastes. Microplastics refer to plastic fibers, particles, or films with a size less than 5 mm. Microplastics in the water environment have attracted wide attention due to their huge quantity, fast growth rate, enrichment and release of toxic and harmful substances, and the ability to endanger human health through the food chain.

[0003] Although the prior art can collect microplastics in water through sampling equipment, the equipment is prone to sink to the bottom in natural rivers, and it is difficult to float on the surface water for a long time. Moreover, impurities in the water are likely to block the mesh holes, resulting in inaccurate flow measurement and too low microplastic collection efficiency, etc., and it is difficult to obtain accurate quantitative results. Therefore, those skilled in the art have provided a passive sampler applied to natural waters and capable of grading microplastics at the same time to solve the problems raised in the above background art. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the disadvantages existing in the prior art, and to propose a passive sampler for microplastics in natural waters, which provides a passive sampler for microplastics in natural waters that can avoid the sampler from sinking to the bottom by setting an airbag, and at the same time, a flow meter and filters or filter membranes with different pore sizes are arranged in the shell to effectively calculate the water area flow and grade the microplastics.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A passive sampler for microplastics in natural waters, including an airbag and a shell, the shell is arranged at the bottom end of the airbag, one side of the airbag is fixedly connected with a connecting pipe, the other end of the connecting pipe is threadedly connected with a lid, the bottom end of the airbag is fixedly connected with two sleeves, the inner side walls of the two sleeves are respectively slidably connected with screw rods, the bottom ends of the two screw rods are respectively rotatably connected with rotating blocks, and the bottom ends of the two rotating blocks are respectively rotatably connected with the top end of the shell;

[0006] Through the above technical solution, by setting an airbag and injecting gas into the airbag, the whole device can float in the water, so that the sampler will not sink to the bottom during the sampling process. At the same time, sleeves are arranged at the bottom end of the airbag, and by rotating the screw rods, the position of the sampler in the water can be adjusted to make the sampling effect better.

[0007] Further, a water inlet is provided on one side of the housing, and a drain outlet is fixedly connected to the other side of the housing. First filters are fixedly connected to the inner side walls of the water inlet and the drain outlet respectively. A metal filter is fixedly connected to the inner side wall of the housing close to the first filter. A second filter is fixedly connected to the inner side wall of the housing close to the metal filter. A third filter is fixedly connected to the inner side wall of the housing close to the second filter. An installation frame is fixedly connected to the inner side wall of the housing close to the third filter. A flow meter is provided on the other side of the installation frame. A memory is fixedly connected to the upper position on one side of the installation frame, and a controller is fixedly connected to the lower position on one side of the installation frame;

[0008] Through the above technical solution, a flow meter is provided in the housing. The flow meter can be used to calculate the water flux, effectively avoiding transporting a large amount of water back to the laboratory during the sampling process and effectively simplifying the operation steps of the operator.

[0009] Further, the two screws are respectively threadedly connected to the inner side wall of the sleeve;

[0010] Through the above technical solution, the depth of the sampler can be effectively adjusted.

[0011] Further, the connecting pipe is communicated with the inside of the airbag;

[0012] Through the above technical solution, gas can be effectively injected into the airbag.

[0013] Further, the aperture diameters of the two first filters are 5 mm;

[0014] Through the above technical solution, the impurities in the water body are preliminarily filtered, effectively avoiding inaccurate experimental results.

[0015] Further, the memory and the flow meter are both electrically connected to the controller;

[0016] Through the above technical solution, the overall device can be effectively controlled.

[0017] Further, the second filter uses an internally installed 45 μm polycarbonate filter membrane, and the third filter uses an internally installed 5 μm polycarbonate filter membrane;

[0018] Through the above technical solution, microplastics of different sizes can be effectively classified and collected.

[0019] The utility model has the following beneficial effects:

[0020] 1. In the present utility model, by providing an airbag and injecting gas into the airbag, the entire device can float in water, so that the sampler will not sink to the bottom during the sampling process. At the same time, a sleeve is provided at the bottom of the airbag. By rotating the screw rod, the position of the sampler in water can be adjusted, making the water flow rate more stable and the sampling effect better.

[0021] 2. In the present utility model, a flowmeter is provided in the housing. By using the flowmeter, the water flux can be calculated, effectively avoiding transporting a large amount of water back to the laboratory during the sampling process and effectively simplifying the operation steps of the operator.

[0022] 3. In the present utility model, a first filter screen is provided in the water inlet and the water outlet. By using the first filter screen, impurities in the water body can be preliminarily filtered, reducing the blockage of the filter membrane. At the same time, filter membranes with different pore sizes are provided to classify the microplastics in the water passing through the device according to particle size. Description of the Drawings

[0023] Figure 1 is a perspective view of a passive sampler for microplastics in natural water bodies proposed by the present utility model;

[0024] Figure 2 is a cross-sectional view of a passive sampler for microplastics in natural water bodies proposed by the present utility model;

[0025] Figure 3 is a side view of a passive sampler for microplastics in natural water bodies proposed by the present utility model;

[0026] Figure 4 is Figure 1 the enlarged view at A in

[0027] Legend Explanation:

[0028] 1. Airbag; 101. Connecting pipe; 102. Lid; 103. Sleeve; 104. Screw rod; 105. Rotating block; 2. Housing; 201. First filter screen; 202. Drain outlet; 203. Metal filter screen; 204. Second filter screen; 205. Third filter screen; 206. Controller; 207. Mounting rack; 208. Flowmeter; 209. Water inlet; 2010. Memory. Detailed Embodiment

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0030] Reference Figures 1-4 As shown in Figures 1-4 , an embodiment provided by the present utility model is a passive sampler for microplastics in natural water bodies, which includes an airbag 1 and a housing 2. The housing 2 is arranged at the bottom end of the airbag 1. One side of the airbag 1 is fixedly connected with a connecting pipe 101, and the other end of the connecting pipe 101 is threadedly connected with a lid 102. The bottom end of the airbag 1 is fixedly connected with two sleeves 103. The inner side walls of the two sleeves 103 are respectively slidably connected with screw rods 104. The bottom ends of the two screw rods 104 are respectively rotatably connected with rotating blocks 105. The bottom ends of the two rotating blocks 105 are respectively rotatably connected with the top end of the housing 2. By setting the airbag 1 and injecting gas into the airbag 1, the whole device can float in the water, so that the sampler will not sink to the bottom during the sampling process. At the same time, sleeves 103 are arranged at the bottom end of the airbag 1. By rotating the screw rods 104, the position of the sampler in the water can be adjusted to make the sampling effect better.

[0031] One side of the housing 2 is provided with a water inlet 209, and the other side of the housing 2 is fixedly connected with a drain outlet 202. The inner side walls of the water inlet 209 and the drain outlet 202 are respectively fixedly connected with a first filter screen 201. The inner side wall of the housing 2 near the first filter screen 201 is fixedly connected with a metal filter screen 203. The inner side wall of the housing 2 near the metal filter screen 203 is fixedly connected with a second filter screen 204, which is internally provided with a 45μm polycarbonate filter membrane, supported by metal meshes on both sides, and an O-ring is fixed in the middle of the internal sampler. The inner side wall of the housing 2 near the second filter screen 204 is fixedly connected with a third filter screen 205, which is internally provided with a 5μm polycarbonate filter membrane, also supported by metal meshes on both sides, and an O-ring is fixed in the middle of the internal sampler. The inner side wall of the housing 2 near the third filter screen 205 is fixedly connected with a mounting bracket 207. The other side of the mounting bracket 207 is provided with a flowmeter 208. The upper position on one side of the mounting bracket 207 is fixedly connected with a memory 2010, and the lower position on one side of the mounting bracket 207 is fixedly connected with a controller 206. By setting the flowmeter 208 in the housing 2, the water flux can be calculated by using the flowmeter 208, effectively avoiding transporting a large amount of water back to the laboratory during the sampling process and effectively simplifying the operation steps of the operator.

[0032] The two screw rods 104 are respectively threadedly connected with the inner side walls of the sleeves 103. The connecting pipe 101 is internally communicated with the airbag 1. The aperture of the two first filter screens 201 is 5mm. Both the memory 2010 and the flowmeter 208 are electrically connected to the controller 206. The second filter screen 204 uses a built-in 45μm polycarbonate filter membrane, and the third filter screen 205 uses a built-in 5μm polycarbonate filter membrane. By setting the first filter screen 201 in the water inlet 209 and the drain outlet 202, the impurities in the water body can be preliminarily filtered by using the first filter screen 201, effectively avoiding inaccurate experimental results.

[0033] Working principle: By setting the airbag 1 and injecting gas into the airbag 1, the whole device can float in water, so that the sampler will not sink to the bottom during the sampling process. At the same time, a sleeve 103 is arranged at the bottom end of the airbag 1. By rotating the screw 104, the position of the sampler in water can be adjusted to achieve a better sampling effect. A flowmeter 208 is arranged in the housing 2, and the flowmeter 208 can be used to calculate the water flux, effectively avoiding transporting a large amount of water back to the laboratory during the sampling process, and effectively simplifying the operation steps of the operator. A first filter screen 201 is arranged in the water inlet 209 and the drain outlet 202. The first filter screen 201 can be used to preliminarily filter the impurities in the water body, effectively avoiding inaccurate experimental results. The second filter screen 204 and the third filter screen 205 can classify microplastics with different particle sizes on-site in the wild, greatly reducing the workload of microscopic examination in the laboratory.

[0034] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A passive sampler for microplastics in natural water, comprising an air bag (1) and a shell (2), wherein the shell (2) is arranged at the bottom of the air bag (1), characterized in that: A connecting tube (101) is fixedly connected to one side of the airbag (1), and a cover (102) is threadedly connected to the other end of the connecting tube (101). Two sleeves (103) are fixedly connected to the bottom end of the airbag (1), and the inner side walls of the two sleeves (103) are respectively slidably connected to screw rods (104). The bottom ends of the two screw rods (104) are respectively rotatably connected to rotating blocks (105), and the bottom ends of the two rotating blocks (105) are respectively rotatably connected to the top end of the shell (2).

2. A passive sampler for microplastics in natural water according to claim 1, characterized in that: A water inlet (209) is provided on one side of the shell (2), and a drain outlet (202) is fixedly connected to the other side of the shell (2); the inner side walls of the water inlet (209) and the drain outlet (202) are respectively fixedly connected to a first filter screen (201); a metal filter screen (203) is fixedly connected to the inner side wall of the shell (2) on the side close to the first filter screen (201); a second filter screen (204) is fixedly connected to the inner side wall of the shell (2) on the side close to the metal filter screen (203); A third filter screen (205) is fixedly connected to one side of the inner wall of the shell (2) close to the second filter screen (204), a mounting frame (207) is fixedly connected to one side of the inner wall of the shell (2) close to the third filter screen (205), a flow meter (208) is arranged on the other side of the mounting frame (207), a memory (2010) is fixedly connected to one side of the mounting frame (207) at an upper position, and a controller (206) is fixedly connected to one side of the mounting frame (207) at a lower position.

3. A passive sampler for microplastics in natural water according to claim 1, characterized in that: The two screw rods (104) are respectively threadedly connected to the inner wall of the sleeve (103).

4. A passive sampler for microplastics in natural water according to claim 1, characterized in that: The connecting pipe (101) is in communication with the interior of the airbag (1).

5. A passive sampler for microplastics in natural water according to claim 2, characterized in that: The apertures of the two first filter screens (201) are 5 mm.

6. A passive sampler for microplastics in natural water according to claim 2, characterized in that: The memory (2010) and the flow meter (208) are both electrically connected to the controller (206).

7. A passive sampler for microplastics in natural water according to claim 2, characterized in that: The second filter screen (204) has a built-in 45 μm polycarbonate filter membrane, and the third filter screen (205) has a built-in 5 μm polycarbonate filter membrane.

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