A device for pretreating microplastic samples in water environment using persulfate oxidation method

Abstract

The present invention discloses a device for pretreating microplastic samples in water environment by using persulfate oxidation method, and relates to the technical field of microplastic sample treatment in water environment, including a box, a motor is fixedly connected to the top of the box, a transmission rod is fixedly connected to the output end of the motor, the transmission rod passes through the box and is rotatably connected thereto, a plurality of first stirring rods are fixedly connected to the outer wall of the transmission rod, a rotating blade is fixedly connected to the bottom of the transmission rod, two connecting rods are fixedly connected to the side wall of the transmission rod, and the opposite sections of the two connecting rods are fixedly connected to a scraper, two stirring mechanisms are arranged in the box, and a conveying mechanism is arranged on the top of the box. The present invention can stir and mix the persulfate solution with the microplastic sample in the water environment through the cooperation of the first stirring rod, the rotating blade and the second stirring rod, and the two react fully; the liquid at the bottom can be refluxed to the top through the conveying mechanism, so that the two are evenly mixed, and the two react better.

Description

Technical Field

[0001] The invention relates to the technical field of microplastic sample processing in water environments, and in particular to a device for pre-treating microplastic samples in water environments using a persulfate oxidation method. Background Art

[0002] The prior art discloses a device for pretreating microplastic samples in water environment using persulfate oxidation method with application number CN202020515195.4, comprising a stirring chamber, a pillar fixedly connected to the bottom of the stirring chamber, one end of the pillar fixedly connected to a first base, a non-slip pad fixedly connected to the bottom of the first base, a water outlet pipe fixedly connected to the bottom of the stirring chamber, a first valve body movably connected to the inner wall of the water outlet pipe, and a first water inlet pipe fixedly connected to one side of the stirring chamber. The device for pretreating microplastic samples in water environment using persulfate oxidation method can achieve the purpose of good stirring effect, solves the problem of poor stirring effect of the device for pretreating microplastic samples in water environment using persulfate oxidation method in general, enables persulfate to fully react with microplastic samples in water environment, thereby improving the work efficiency of the staff, thereby improving the practicality of the device.

[0003] In the prior art, when stirring persulfate solution and aquatic microplastic samples, the liquids are only stirred and mixed by multiple stirring blades, which takes a lot of time to mix the two evenly. It is time-consuming and labor-intensive, and the stirring effect is poor. Therefore, we designed a device for pretreating aquatic microplastic samples using persulfate oxidation method to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings existing in the prior art, and a device for pretreating microplastic samples in an aquatic environment using a persulfate oxidation method is proposed. The cooperation of a first stirring rod, a rotating paddle and a second stirring rod can stir and mix the persulfate solution with the microplastic sample in the aquatic environment, and the two react fully; the liquid at the bottom can be returned to the top through a conveying mechanism, so that the two are evenly mixed and the reaction between the two is better.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A device for pretreating microplastic samples in an aquatic environment using a persulfate oxidation method, comprising a box body, a feed hopper connected to the box body is provided on the top of the box body, a motor is fixedly connected to the top of the box body, a transmission rod is fixedly connected to the output end of the motor, the transmission rod passes through the box body and is rotatably connected thereto, a plurality of first stirring rods are fixedly connected to the outer wall of the transmission rod, a rotating paddle is fixedly connected to the bottom of the transmission rod, two connecting rods are fixedly connected to the side wall of the transmission rod, and scrapers are fixedly connected to opposite sections of the two connecting rods, two stirring mechanisms are provided in the box body, a conveying mechanism is provided on the top of the box body, a raw material box is fixedly connected to the side wall of the box body, a drain pipe is fixedly connected to the raw material box, the drain pipe passes through the box body and is fixedly connected thereto, and a discharge hopper connected thereto is provided at the bottom of the box body.

[0007] Preferably, the stirring mechanism includes a telescopic rod passing through the box body and rotatably connected thereto, the outer wall of the telescopic rod and the outer wall of the transmission rod are jointly sleeved with a belt, the bottom of the telescopic rod is fixedly connected to a first reciprocating screw rod, the outer wall of the first reciprocating screw rod is sleeved with a U-shaped plate, the U-shaped plate is fixedly connected to the inner top of the box body, the bottom of the first reciprocating screw rod is fixedly connected to a rotating rod, and the outer wall of the rotating rod is fixedly connected to a plurality of second stirring rods.

[0008] Preferably, the conveying mechanism includes an active bevel gear fixedly connected to the outer wall of the telescopic rod on the right side, the active bevel gear meshes with a driven bevel gear, the driven bevel gear is coaxially fixedly connected to a second reciprocating screw, the top of the box is fixedly connected to a limiting block, the second reciprocating screw passes through the limiting block and is rotatably connected thereto, the top of the box is fixedly connected to a sealing frame, the outer wall of the second reciprocating screw is sleeved with a U-shaped block, the U-shaped block is fixedly connected with a sealing block, the sealing block is located in the sealing frame and is slidably connected to its inner wall, the side wall of the box is penetrated by a first connecting tube fixedly connected thereto, the first connecting tube passes through the sealing frame and is fixedly connected thereto, the sealing frame is penetrated by a second connecting tube fixedly connected thereto, the second connecting tube passes through the box and is fixedly connected thereto.

[0009] Preferably, the plurality of first stirring rods and second stirring rods are distributed at equal intervals.

[0010] Preferably, a driving wheel is fixedly connected to the outer wall of the transmission rod, a driven wheel is fixedly connected to the outer wall of the telescopic rod, and the belt sleeve is arranged on the outer walls of the driving wheel and the driven wheel.

[0011] Preferably, the cross section of the sealing block is rectangular, and the sealing block is sealed with the inner wall of the sealing frame.

[0012] Preferably, a first one-way valve is fixedly connected to the outer wall of the first connecting pipe, and a second one-way valve is fixedly connected to the outer wall of the second connecting pipe.

[0013] Preferably, a first electromagnetic valve is fixedly connected to the outer wall of the liquid discharge pipe, and a second electromagnetic valve is fixedly connected to the outer wall of the discharge hopper.

[0014] Preferably, four supporting legs are fixedly connected to the bottom of the box body, and the four supporting legs are installed and fixed to the box body by welding, and the positions of the four supporting legs are distributed in a rectangular shape.

[0015] Preferably, the top ends of the two connecting rods are respectively fixedly connected with flow-promoting swing parts, and the flow-promoting swing parts include multiple self-swinging rings, and the multiple self-swinging rings are sequentially sleeved on the axial flow rod, and the bottom end of the axial flow rod is fixedly connected to the connecting rod, and a pleat net is connected between the multiple self-swinging rings, wherein a limited displacement rod is fixedly connected between the self-swinging ring close to the connecting rod and the axial flow rod, and the self-swinging rings are sequentially provided with floating air rings and sand sinking bags from the inside to the outside, and a magnetic attraction ring is provided at the upper end of the self-swinging ring.

[0016] Preferably, a magnet block is installed on the second stirring rod at the bottom end of the rotating rod, and the magnet block installed on the second stirring rod and the magnetic attraction ring arranged on the upper end of the self-swinging ring have opposite magnetic properties. The rotating rod and the axial flow rod are located on the same vertical center line.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The output end of the motor drives the transmission rod and multiple first stirring rods to rotate, so that the water environment microplastic sample and the persulfate solution can be fully stirred and the two can react fully. The transmission rod drives the rotating blade to rotate, and the liquid above the rotating blade can be injected to the bottom, so that the water environment microplastic sample and the persulfate solution are fully mixed and the two can react fully.

[0019] 2. The transmission rod rotates to drive the two belts, the telescopic rod, the first reciprocating screw, the rotating rod and the second stirring rod to rotate. The multiple second stirring rods rotate and move up and down to make the water environment microplastic samples and the persulfate solution more fully stirred and the reaction between the two more complete.

[0020] 3. The telescopic rod is rotated to drive the active bevel gear, the driven bevel gear, and the second reciprocating screw to rotate, so that the U-shaped block and the sealing block can be moved in the sealing frame, so that the liquid at the bottom of the box can be injected into the top of the box, and the microplastic sample in the water environment and the persulfate solution can be fully mixed to make the two react fully.

[0021] 4. Through the rotation of the scraper, multiple self-swinging rings are driven to swing back and forth on the axial flow rod to hit, thereby breaking up the materials and greatly stirring the solution. The second stirring rod rotates and moves up and down, which can attract the self-swinging ring to move up and down, thereby unfolding the pleated net to intercept large particles of sediment to prevent blockage. When the second stirring rod loses gravity due to the large distance between the self-swinging ring, under the action of the sand settling bag, each self-swinging ring falls quickly for vertical impact, thereby increasing the mixing effect.

[0022] In summary, the present invention can stir and mix the persulfate solution and the water environment microplastic sample through the cooperation of the first stirring rod, the rotating blade and the second stirring rod, and the two can react fully; the liquid at the bottom can be returned to the top through the conveying mechanism, so that the two are mixed evenly and the reaction between the two is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of a device for pretreating microplastic samples in an aquatic environment using a persulfate oxidation method, as proposed by the present invention;

[0024] Figure 2 A cross-sectional view of a device for pretreating microplastic samples in an aquatic environment using a persulfate oxidation method proposed by the present invention;

[0025] Figure 3 A cross-sectional view of part of the mechanism of a device for pretreating microplastic samples in an aquatic environment using a persulfate oxidation method proposed by the present invention;

[0026] Figure 4 for Figure 2 A magnified view of the structure at center;

[0027] Figure 5 This is a schematic diagram of the structure of a flow-promoting pendulum in a device for pretreating microplastic samples in an aquatic environment using a persulfate oxidation method proposed by the present invention;

[0028] Figure 6 for Figure 5 Schematic diagram of the rising state of the middle self-oscillating ring;

[0029] Figure 7 for Figure 5 Schematic diagram of the retracted state of the middle self-swinging ring;

[0030] Figure 8 for Figure 5 Schematic diagram of the maximum swing range of the middle self-swinging ring;

[0031] Fig. 9 for Figure 5 Schematic diagram of the specific structure of the self-swinging ring.

[0032] In the figure: 1 box body, 2 feed hopper, 3 motor, 4 transmission rod, 5 first stirring rod, 6 rotating blade, 7 belt, 8 telescopic rod, 9 first reciprocating screw, 10 U-type plate, 11 rotating rod, 12 second stirring rod, 13 connecting rod, 14 scraper, 15 active bevel gear, 16 driven bevel gear, 17 second reciprocating screw, 18 limit block, 19 U-type block, 20 sealing frame, 21 sealing block, 22 first connecting pipe, 23 first one-way valve, 24 second connecting pipe, 25 second one-way valve, 26 raw material box, 27 discharge pipe, 28 first electromagnetic valve, 29 discharge hopper, 30 second electromagnetic valve, 31 support leg, 32 flow-promoting pendulum, 3201 self-swinging ring, 3202 axial flow rod, 3203 pleat net, 3204 limit shift rod, 3205 sand settling bag, 3206 floating air ring, 3207 magnetic suction ring. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Example

[0034] Reference Figure 1-4 A device for pretreating microplastic samples in an aquatic environment using a persulfate oxidation method comprises a box body 1, a feed hopper 2 connected to the box body 1 is provided on the top of the box body 1, a motor 3 is fixedly connected to the top of the box body 1, a transmission rod 4 is fixedly connected to the output end of the motor 3, the transmission rod 4 passes through the box body 1 and is rotatably connected to the transmission rod 4, a plurality of first stirring rods 5 are fixedly connected to the outer wall of the transmission rod 4, which can stir the liquid once, and a rotating paddle 6 is fixedly connected to the bottom of the transmission rod 4, which can transport the liquid on the upper side of the rotating paddle 6 to the lower side of the rotating paddle 6 to mix the liquid evenly.

[0035] The side wall of the transmission rod 4 is fixedly connected to two connecting rods 13, and the opposite sections of the two connecting rods 13 are fixedly connected to scrapers 14. The scrapers 14 are arranged against the inner wall of the box body 1 to scrape off the raw materials attached to the inner wall to make the reaction sufficient. Two stirring mechanisms are arranged in the box body 1, and the stirring mechanism includes a telescopic rod 8 that penetrates the box body 1 and is rotatably connected thereto. The outer wall of the telescopic rod 8 and the outer wall of the transmission rod 4 are jointly sleeved with a belt 7. The outer wall of the transmission rod 4 is fixedly connected to a driving wheel, and the outer wall of the telescopic rod 8 is fixedly connected to a driven wheel. The belt 7 is sleeved on the outer walls of the driving wheel and the driven wheel, the bottom of the telescopic rod 8 is fixedly connected to the first reciprocating screw rod 9, the outer wall of the first reciprocating screw rod 9 is sleeved with a U-shaped plate 10, the U-shaped plate 10 is fixedly connected to the inner top of the box body 1, the bottom of the first reciprocating screw rod 9 is fixedly connected to the rotating rod 11, the outer wall of the rotating rod 11 is fixedly connected to a plurality of second stirring rods 12, the plurality of first stirring rods 5 and the second stirring rods 12 are distributed at equal intervals, and the liquid can be mixed better by rotating and moving the plurality of second stirring rods 12 up and down.

[0036] A conveying mechanism is provided on the top of the box body 1, and the conveying mechanism includes an active bevel gear 15 fixedly connected to the outer wall of the telescopic rod 8 on the right side, the active bevel gear 15 is meshed with a driven bevel gear 16, and the driven bevel gear 16 is coaxially fixedly connected with a second reciprocating screw rod 17, the top of the box body 1 is fixedly connected to a limit block 18, the second reciprocating screw rod 17 passes through the limit block 18 and is rotatably connected thereto, the top of the box body 1 is fixedly connected to a sealing frame 20, the outer wall of the second reciprocating screw rod 17 is sleeved with a U-shaped block 19, the U-shaped block 19 is fixedly connected to a sealing block 21, the sealing block 21 is located in the sealing frame 20 and is slidably connected to the inner wall thereof, the cross-section of the sealing block 21 is rectangular, so that the sealing block 21 can slide back and forth in the sealing frame 20, and the sealing block 21 and the sealing frame The inner wall of the body 20 is sealed, and a first connecting pipe 22 fixedly connected to the side wall of the box body 1 is penetrated by a first connecting pipe 22, and a first one-way valve 23 is fixedly connected to the outer wall of the first connecting pipe 22. The first connecting pipe 22 penetrates the sealing frame 20 and is fixedly connected thereto. A second connecting pipe 24 fixedly connected to the sealing frame 20 is penetrated by a second connecting pipe 24, and a second one-way valve 25 is fixedly connected to the outer wall of the second connecting pipe 24. The second connecting pipe 24 penetrates the box body 1 and is fixedly connected thereto. The first connecting pipe 22 extends to the bottom of the box body 1. The setting of the first connecting pipe 22 will not affect the stirring work of the first stirring rod 5 and the second stirring rod 12. The liquid at the bottom of the box body 1 flows back into the box body 1 through the first connecting pipe 22 and the second connecting pipe 24, so that the liquids are evenly mixed and react fully.

[0037] A raw material box 26 is fixedly connected to the side wall of the box body 1, a drain pipe 27 is fixedly connected to the raw material box 26, a first electromagnetic valve 28 is fixedly connected to the outer wall of the drain pipe 27, the drain pipe 27 passes through the box body 1 and is fixedly connected thereto, a discharge hopper 29 connected thereto is provided at the bottom of the box body 1, a second electromagnetic valve 30 is fixedly connected to the outer wall of the discharge hopper 29, four supporting legs 31 are fixedly connected to the bottom of the box body 1, the four supporting legs 31 are all installed and fixed to the box body 1 by welding, and the positions of the four supporting legs 31 are distributed in a rectangular shape. Example

[0038] Reference Figure 5-9The top ends of the two connecting rods 13 are respectively fixedly connected with flow-promoting swing members 32, and the flow-promoting swing members 32 include a plurality of self-swinging rings 3201, which are sequentially sleeved on the axial flow rod 3202, and the bottom ends of the axial flow rods 3202 are fixedly connected to the connecting rod 13, and a pleat-inducing net 3203 is connected between the plurality of self-swinging rings 3201, wherein the self-swinging rings 3201 close to the connecting rod 13 and the axial flow rod 3202 are fixedly connected with the limited displacement rod 3203. 204, the self-oscillating ring 3201 is provided with a floating air ring 3206 and a sand settling bag 3205 from the inside to the outside, and a magnetic attraction ring 3207 is provided at the upper end of the self-oscillating ring 3201. The floating air ring 3206 is filled with gas to assist the self-oscillating ring 3201 to float in the sulfate solution. The sand settling bag 3205 is filled with sand to increase the self-weight of the self-oscillating ring 3201. A magnet block is installed on the second stirring rod 12 at the bottom end of the rotating rod 11. The magnetic attraction ring The adsorption force generated when 3207 is close to the magnet block is greater than the self-weight of the sand bag 3205. As the multiple second stirring rods 12 rotate and move up and down, they can attract the self-swinging ring 3201 at the top of the axial flow rod 3202 to move up and down (the descending height of the second stirring rod 12 will not hinder the expansion of the multiple self-swinging rings 3201). The magnetism of the magnet block installed on the second stirring rod 12 and the magnetic attraction ring 3207 set on the upper end of the self-swinging ring 3201 is opposite, and the pleated net 3203 can be expanded, so as to intercept and filter the internal particulate matter, and the self-swinging ring 3201 mounted on the axial flow rod 3202 can swing back and forth driven by the connecting rod 13 and the scraper 14, so as to continuously collide left and right to break up the sediment, and when the self-swinging ring 3201 descends, it can be quickly reset under the drive of the sand bag 3205, so as to achieve vertical collision and better mixing effect.

[0039] In the present invention, the staff injects an appropriate amount of water environment microplastic samples through the feed hopper 2, opens the first electromagnetic valve 28, and injects the persulfate solution in the raw material box 26 into the box body 1 through the discharge pipe 27. At this time, the motor 3 is started, and the transmission rod 4 and multiple first stirring rods 5 are driven to rotate through the output end of the motor 3. The rotation of multiple first stirring rods 5 can fully stir the water environment microplastic samples and the persulfate solution, so that the two react fully, and the rotation of the transmission rod 4 drives the rotating blade 6 to rotate. The rotation of the rotating blade 6 can inject the liquid above the rotating blade 6 to the bottom, so that the water environment microplastic sample and the persulfate solution are fully mixed, so that the two react fully; the two belts 7, the telescopic rod 8, the first reciprocating screw 9, the rotating rod 11 and the second stirring rod 12 are driven to rotate by the rotation of the transmission rod 4, and the first reciprocating screw 9 and the U-shaped plate 10 can cooperate to make the first reciprocating screw 9 and the rotating rod 11 and the second stirring rod 12 rotate and move up and down (the telescopic rod 8 is synchronously extended and retracted during this process). By rotating and moving up and down multiple second stirring rods 12, the water environment microplastic sample and the persulfate solution can be stirred more fully, so that the two react more fully; the telescopic rod 8 rotates to drive the active bevel gear 15, the driven bevel gear 16, and the second reciprocating screw 17 to rotate, and the U-shaped block 19 and the sealing block 21 can be moved in the sealing frame 20 through the cooperation of the second reciprocating screw 17 and the limit block 18. When the sealing block 21 moves forward, the space behind the sealing block 21 becomes larger to form a negative pressure. At this time, the liquid in the box 1 is injected into the sealing frame 20 through the first connecting pipe 22. When the sealing block 21 moves backward, the liquid in the sealing frame 20 is injected into the box 1 through the second connecting pipe 24, so that the liquid at the bottom of the box 1 is injected into the top of the box 1, and the water environment microplastic sample and the persulfate solution are fully mixed, so that the two react fully.

[0040] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for pretreating microplastic samples in an aquatic environment using a persulfate oxidation method, comprising a housing (1), characterized in that: A feed hopper (2) connected to the box (1) is provided on the top of the box (1), a motor (3) is fixedly connected to the top of the box (1), a transmission rod (4) is fixedly connected to the output end of the motor (3), the transmission rod (4) passes through the box (1) and is rotatably connected thereto, a plurality of first stirring rods (5) are fixedly connected to the outer wall of the transmission rod (4), a rotating blade (6) is fixedly connected to the bottom of the transmission rod (4), two connecting rods (13) are fixedly connected to the side wall of the transmission rod (4), and the opposite sections of the two connecting rods (13) are fixedly connected to scrapers (14), two stirring mechanisms are provided in the box (1), a conveying mechanism is provided on the top of the box (1), a raw material box (26) is fixedly connected to the side wall of the box (1), a drainage pipe (27) is fixedly connected to the raw material box (26), the drainage pipe (27) passes through the box (1) and is fixedly connected thereto, and a discharge hopper (29) connected thereto is provided at the bottom of the box (1); The stirring mechanism comprises a telescopic rod (8) penetrating the box body (1) and being rotatably connected thereto, the outer wall of the telescopic rod (8) and the outer wall of the transmission rod (4) being sleeved with a belt (7), the bottom of the telescopic rod (8) being fixedly connected to a first reciprocating screw rod (9), the outer wall of the first reciprocating screw rod (9) being sleeved with a U-shaped plate (10), the U-shaped plate (10) being fixedly connected to the inner top of the box body (1), the bottom of the first reciprocating screw rod (9) being fixedly connected to a rotating rod (11), and the outer wall of the rotating rod (11) being fixedly connected to a plurality of second stirring rods (12); The conveying mechanism comprises an active bevel gear (15) fixedly connected to the outer wall of the right telescopic rod (8), the active bevel gear (15) meshing with a driven bevel gear (16), the driven bevel gear (16) being coaxially fixedly connected to a second reciprocating screw (17), the top of the box (1) being fixedly connected to a limit block (18), the second reciprocating screw (17) passing through the limit block (18) and being rotatably connected thereto, the top of the box (1) being fixedly connected to a sealing frame (20), the outer wall of the second reciprocating screw (17) A U-shaped block (19) is sleeved, the U-shaped block (19) is fixedly connected to a sealing block (21), the sealing block (21) is located in a sealing frame (20) and is slidably connected to an inner wall thereof, a first connecting pipe (22) is passed through a side wall of the box body (1) and is fixedly connected to the box body, the first connecting pipe (22) passes through the sealing frame body (20) and is fixedly connected thereto, a second connecting pipe (24) is passed through the sealing frame body (20) and is fixedly connected thereto, the second connecting pipe (24) passes through the box body (1) and is fixedly connected thereto; The outer wall of the transmission rod (4) is fixedly connected to a driving wheel, the outer wall of the telescopic rod (8) is fixedly connected to a driven wheel, and the belt (7) is sleeved on the outer walls of the driving wheel and the driven wheel; The sealing block (21) has a rectangular cross section, and the sealing block (21) is sealed with the inner wall of the sealing frame (20); the outer wall of the first connecting pipe (22) is fixedly connected to a first one-way valve (23), and the outer wall of the second connecting pipe (24) is fixedly connected to a second one-way valve (25); Four supporting legs (31) are fixedly connected to the bottom of the box body (1), and the four supporting legs (31) are installed and fixed to the box body (1) by welding, and the positions of the four supporting legs (31) are distributed in a rectangular shape; The top ends of the two connecting rods (13) are respectively fixedly connected to flow-promoting swing members (32), the flow-promoting swing members (32) comprising a plurality of self-swinging rings (3201), the plurality of self-swinging rings (3201) being sequentially sleeved on the axial flow rod (3202), the bottom end of the axial flow rod (3202) being fixedly connected to the connecting rod (13), a pleat-inducing net (3203) being connected between the plurality of self-swinging rings (3201), wherein the self-swinging ring (3201) close to the connecting rod (13) and the axial flow rod are connected to the pleat-inducing net (3203). (3202), the self-swinging ring (3201) is provided with a floating air ring (3206) and a sand bag (3205) in sequence from the inside to the outside, and a magnetic attraction ring (3207) is provided at the upper end of the self-swinging ring (3201), and a magnet block is installed on the second stirring rod (12) at the bottom end of the rotating rod (11), and the magnetism of the magnet block installed on the second stirring rod (12) and the magnetic attraction ring (3207) provided on the upper end of the self-swinging ring (3201) are opposite.

2. A device for pretreating microplastic samples in an aquatic environment using a persulfate oxidation method according to claim 1, characterized in that: The plurality of first stirring rods (5) and second stirring rods (12) are distributed at equal intervals.

3. The device for pretreating microplastic samples in an aquatic environment using a persulfate oxidation method according to claim 1, characterized in that: A first electromagnetic valve (28) is fixedly connected to the outer wall of the liquid discharge pipe (27), and a second electromagnetic valve (30) is fixedly connected to the outer wall of the material discharge hopper (29).

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