A passive sampler for determining antibiotics in river water and application thereof

Abstract

The application discloses a passive sampler for determining antibiotics in river water bodies, comprising a top plate, a switching telescopic sleeve rod, and high-speed sampling components, medium-speed sampling components and low-speed sampling components arranged in sequence from top to bottom; the switching telescopic sleeve rod comprises a first telescopic rod and a switching tube sleeved on the first telescopic rod; the high-speed sampling components, the medium-speed sampling components and the low-speed sampling components are all composed of an internally hollow baffle, a first sampling bottle, a liquid-driven component and a fourth ratchet plate; and the elasticity of the liquid capsule rods of the high-speed sampling components, the medium-speed sampling components and the low-speed sampling components increases in sequence; the passive sampler is applied to determining the concentration of antibiotics in river water bodies, and can collect water samples under different flow rates according to the flow rate change of the river water bodies, thereby improving the determination accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sampling, in particular to a passive sampler for determining antibiotics in river water and application thereof. BACKGROUND

[0002] Antibiotics are a class of natural, semi-synthetic or artificially synthesized compounds with microbial resistance activity. As broad-spectrum antibacterial drugs, they are widely used in the treatment of infectious diseases in humans and animals, and are often added as growth promoters in feed. The main sources of antibiotic pollution in the environment are municipal sewage treatment plant wastewater, hospital wastewater, industrial wastewater, and livestock and aquaculture wastewater. After being used by humans and animals, due to poor intestinal absorption or incomplete metabolism, most of the antibiotics are excreted as parent compounds or metabolites into the water body, sediment and soil environment.

[0003] When using the passive sampler to collect antibiotics in river water, the flow rate of the river is not controlled. In the water body with fast flow rate, the contact time between the adsorbent and the pollutant is relatively short, which may reduce the opportunity of the pollutant adsorbed on the adsorbent and affect the final determination result. Therefore, the present application designs a passive sampler for determining antibiotics in river water to solve this problem. SUMMARY

[0004] To solve the above technical problems, the present application provides a passive sampler for determining antibiotics in river water and application thereof.

[0005] The technical scheme of the present application is: a passive sampler for determining antibiotics in river water, comprising a top plate, a switching telescopic sleeve rod arranged on the top plate, and a high-speed sampling assembly, a medium-speed sampling assembly and a low-speed sampling assembly arranged in sequence from top to bottom on the switching telescopic sleeve rod, the switching telescopic sleeve rod comprises a first telescopic rod and a switching pipe sleeved on the first telescopic rod, the inner wall of the switching pipe is provided with a clamping ring corresponding to the height difference of adjacent two sampling assemblies, each clamping ring is provided with a notch and is distributed at equal angles, and the first telescopic rod is provided with a clamping block for passing through the notch,

[0006] The high-speed sampling assembly, the medium-speed sampling assembly and the low-speed sampling assembly each comprise an internally hollow baffle, a first sampling bottle rotatably arranged on the baffle, a liquid power assembly arranged inside the baffle for changing according to the flow rate of the river, and a fourth ratchet plate for opening the liquid power assembly by the first sampling bottle,

[0007] The hydraulic assembly includes a liquid bladder rod for extending according to the water flow rate, a docking plate disposed at one end of the liquid bladder rod, and a water pipe disposed at the other end of the liquid bladder rod. A third air bladder rod for pushing the water pipe back to its original position is provided inside the baffle. A third ratchet plate is provided on one side of the first sampling bottle. The third ratchet plate is connected to the baffle through a seventh air bladder rod. One end of the liquid bladder rod has an opening, and the other end of the liquid bladder rod has a water passage hole.

[0008] The top plate is hollow inside, and the upper end of the switching pipe extends into the top plate and is equipped with a first ratchet. A first ratchet plate is provided on one side of the first ratchet, and the first ratchet plate is connected to the top plate through a second airbag rod. A first air transmission pipe is provided on the top plate, and the lower end of the first air transmission pipe is equipped with a first airbag rod for corresponding to the position of the water pipe.

[0009] Each baffle is equipped with two fourth airbag rods. One of the fourth airbag rods is connected to the seventh airbag rod in its corresponding baffle, and the other fourth airbag rod is connected to the third airbag rod in the upper baffle. The lower end of the first air transmission tube is equipped with a switching plate for squeezing the fourth airbag rod.

[0010] Furthermore, the first sampling bottle includes a filter cartridge, an arc plate fixedly sleeved on the filter cartridge, and an annular plate that is rotatably and sealingly sleeved with the arc plate. The filter cartridge contains an adsorbent for adsorbing antibiotics. The annular plate is provided with through holes for water to pass through. The annular plate of the first sampling bottle is sleeved with a second ratchet and a third ratchet that meshes with a third ratchet plate. The liquid bladder rod is provided with a second ratchet plate that meshes with the second ratchet.

[0011] Instructions: The sampling bottle can be opened or closed by rotating it; the operation is simple.

[0012] Furthermore, the baffle is provided with a second sampling bottle with the same structure as the first sampling bottle, the ring plate of the second sampling bottle is fitted with a first gear, and the liquid bladder rod is provided with a first toothed plate that meshes with the first gear for transmission.

[0013] Note: Setting up a second sampling bottle allows for the collection of more samples without switching sampling components, reduces vertical expansion, and facilitates storage. The first sampling bottle is closed and the second sampling bottle is opened or closed by the extension and retraction of the liquid bladder rod. The structure is simple and has an autonomous adjustment function, eliminating the need for electrical components such as motors.

[0014] Furthermore, the baffle is provided with a sealing and rotating docking plate. One end of the docking plate is provided with a water inlet, and the other end of the docking plate is provided with a docking hole for rotating docking with one end of the liquid bladder rod. A fourth ratchet is sleeved on the docking plate, and the fourth ratchet plate meshes with both the second and fourth ratchet wheels for transmission.

[0015] Note: By opening the first sampling bottle, the liquid bladder rod is simultaneously connected to the river water, saving the time required to connect the liquid bladder rod and the river water separately, thus improving the ease of use of the sampler.

[0016] Furthermore, the top plate is rotatably provided with a second telescopic rod and a third telescopic rod fixedly connected to the second telescopic rod. The bottom of the first sampling bottle is provided with a second gear, and sleeves are sequentially sleeved from the inside to the outside. The sleeves are provided with a third gear that meshes with the corresponding second gear, and the outermost sleeve is provided with a connecting rod that connects to the telescopic end of the first telescopic rod.

[0017] Note: The second telescopic rod can be set up to adjust the sampling depth of the passive sampler, and the passive sampler can be turned on or off by rotating the second telescopic rod in both directions, making the operation simple.

[0018] Furthermore, the top plate is provided with a third toothed plate and a fifth airbag rod with a gap to the third toothed plate. The fixed end of the second telescopic rod is provided with a fourth gear that meshes with the third toothed plate. The switching plate is provided with a sixth airbag rod for pushing the corresponding water pipe. The sixth airbag rod is connected to the fifth airbag rod through a second air transmission pipe.

[0019] Note: The above structure allows the entire passive sampler to be shut down by rotating the second telescopic rod regardless of the state, without the need for additional electrical components, thus improving the ease of use of the passive sampler.

[0020] Furthermore, the filter cartridge is made of 80-120 mesh stainless steel wire mesh, and the adsorbent is selected from any one of activated carbon, ceramic particles or iron oxide.

[0021] Note: The above filter cartridge can reduce the impact of large impurities on water samples, and the above adsorbent has a strong adsorption capacity for antibiotics.

[0022] According to any of the above-mentioned applications of a passive sampler for determining antibiotics in river water, the passive sampler is applied to determine the concentration of antibiotics in river water.

[0023] The beneficial effects of this invention are:

[0024] (1) The passive sampler designed in this invention can automatically switch between low-speed, medium-speed and high-speed sampling components according to the influence of river flow velocity on the expansion and contraction of different elastic liquid bladder rods. This avoids the high-velocity water body from knocking away the antibiotics adsorbed in the low-speed water sample when sampling at high flow velocity, thus destroying the sampling results. It can also obtain water samples at multiple flow velocities, thereby making the antibiotic determination results more comprehensive and accurate.

[0025] (2) The passive sampler designed in this invention can adjust the corresponding sampling components to the same sampling depth when the river flow velocity changes from low speed to medium speed and from medium speed to high speed, so as to avoid the difference in sampling results due to the difference in river flow velocity at different sampling depths, and further improve the accuracy of antibiotic water sampling. Attached Figure Description

[0026] Figure 1 This is an overall appearance view of Embodiment 1 of the passive sampler of the present invention;

[0027] Figure 2 This is a rear view structural diagram of Embodiment 1 of the passive sampler of the present invention;

[0028] Figure 3 This is a structural diagram of the internal structure of the first sampling bottle of the passive sampler of the present invention;

[0029] Figure 4 This is a diagram showing the internal structure of the baffle in Embodiment 1 of the passive sampler of the present invention;

[0030] Figure 5 This is an internal structural diagram of the passive sampler switching telescopic sleeve of the present invention;

[0031] Figure 6 This is a diagram of the internal structure of the top plate of Embodiment 1 of the passive sampler of the present invention;

[0032] Figure 7 This is an overall appearance view of Embodiment 2 of the passive sampler of the present invention;

[0033] Figure 8 This is a diagram of the internal structure of the baffle in Embodiment 3 of the passive sampler of the present invention;

[0034] Figure 9 This is a rear view structural diagram of embodiment 3 of the passive sampler of the present invention;

[0035] Figure 10 This is a diagram of the internal structure of the top plate of Embodiment 3 of the passive sampler of the present invention;

[0036] Among them, 1-top plate, 11-second airbag rod, 111-first ratchet plate, 12-third toothed plate, 13-fifth airbag rod, 2-first telescopic rod, 21-clamping block, 3-baffle, 31-first sampling bottle, 311-filter cartridge, 312-arc plate, 313-ring plate, 314-through hole, 315-second ratchet, 316-third ratchet, 317-second gear, 32-second sampling bottle, 321-first gear, 33-liquid airbag rod, 331-fourth ratchet, 332-second ratchet plate, 3 33-First ratchet plate, 334-Dating plate, 35-Fourth ratchet plate, 36-Third airbag rod, 361-Third ratchet plate, 362-Seventh airbag rod, 363-Fourth airbag rod, 4-Switching plate, 41-First airbag rod, 42-First air transmission tube, 43-Support plate, 44-Sixth airbag rod, 45-Second air transmission tube, 5-Switching tube, 51-First ratchet, 52-Snap-fit ​​ring, 6-Second telescopic rod, 61-Third gear, 62-Connecting rod, 63-Fourth gear, 7-Third telescopic rod. Detailed Implementation

[0037] The present invention will now be described in more detail with reference to specific embodiments, so as to better demonstrate the advantages of the present invention.

[0038] Example 1: A passive sampler for determining antibiotics in river water, such as... Figure 1 and Figure 6 As shown, the device includes a top plate 1, a switching telescopic sleeve rod disposed on the top plate 1, and a high-speed sampling component, a medium-speed sampling component, and a low-speed sampling component arranged sequentially from top to bottom on the switching telescopic sleeve rod. The switching telescopic sleeve rod includes a first telescopic rod 2 and a switching tube 5 sleeved on the first telescopic rod 2. The inner wall of the switching tube 5 is provided with a locking ring 52 corresponding to the height difference between two adjacent sampling components. Each locking ring is provided with a notch and is staggered at equal angles (e.g., 45°). The first telescopic rod 2 is provided with a locking block 21 for passing through the notch.

[0039] like Figure 1 , Figure 2 and Figure 4As shown, the high-speed sampling component, medium-speed sampling component, and low-speed sampling component all consist of a hollow baffle 3, a first sampling bottle 31 rotatably mounted on the baffle 3, a hydraulic component inside the baffle 3 for changing according to the river flow velocity, and a fourth ratchet plate 35 that uses the first sampling bottle 31 to open the hydraulic component. The hydraulic component includes a liquid bladder rod 33 for extending according to the water flow velocity, a docking plate 334 at one end of the liquid bladder rod 33, and a water pipe 34 at the other end of the liquid bladder rod 33. A third air bladder rod 36 is provided inside the baffle 3 for pushing the water pipe 34 back to its original position. A third ratchet plate 361 is provided on one side of the first sampling bottle 31. The third ratchet plate 361 is connected by a seventh air bladder rod 361. The bladder rod 362 is connected to the baffle 3. One end of the bladder rod 33 has an opening, and the other end of the bladder rod 33 has a water passage hole. The elasticity of the bladder rod 33 corresponding to the high-speed sampling component, the medium-speed sampling component, and the low-speed sampling component increases sequentially. That is, the speed range corresponding to the bladder rod 33 of the low-speed sampling component before it extends to the maximum extent is low speed V1. The speed range corresponding to the bladder rod 33 of the low-speed sampling component when it extends to the maximum extent and the bladder rod 33 of the medium-speed sampling component before it extends to the maximum extent is medium speed V2. The speed range corresponding to the bladder rod 33 of the medium-speed sampling component when it extends to the maximum extent and the bladder rod 33 of the high-speed sampling component before it extends to the maximum extent is high speed V3.

[0040] like Figure 1 , Figure 4 and Figure 5 As shown, the first sampling bottle 31 includes a filter cartridge 311, an arc plate 312 fixedly sleeved on the filter cartridge 311, and an annular plate 313 that is rotatably and sealingly sleeved with the arc plate 312. The filter cartridge 311 contains activated carbon adsorbent for adsorbing antibiotics. The filter cartridge is made of 100-mesh stainless steel wire mesh. The annular plate 313 is provided with through holes 314 for water to pass through. The annular plate 313 of the first sampling bottle 31 is sleeved with a second ratchet 315 and a third ratchet 316 that meshes with a third ratchet plate 361. The liquid bladder rod 33 is provided with a second ratchet plate 33 that meshes with the second ratchet 315. 2. A docking plate 334 is sleeved on the liquid bladder rod 33. The docking plate 334 has a docking hole for rotating docking with the water outlet. A fourth ratchet 331 is sleeved on the docking plate 334. A fourth ratchet plate 35 is provided inside the baffle 3, which meshes with both the second ratchet 315 and the fourth ratchet 331. The fourth ratchet plate 35 has a frictional force between itself and the inner wall of the baffle 3 to prevent the fourth ratchet plate 35 from returning to its original position. It can be understood that the second ratchet plate 332 and the fourth ratchet plate 35 are located at different heights, and the thickness of the second ratchet 315 can mesh with both the second ratchet plate 332 and the fourth ratchet plate 35.

[0041] like Figure 2 and Figure 6As shown, the top plate 1 is hollow inside, and the upper end of the switching pipe 5 extends into the top plate 1 and is provided with a first ratchet 51. A first ratchet plate 111 is provided on one side of the first ratchet 51. The first ratchet plate 111 is connected to the top plate 1 through a second airbag rod 11. A first air transmission pipe 42 is provided on the top plate 1, and the lower end of the first air transmission pipe 42 is provided with a first airbag rod 41 for corresponding to the position of the water pipe 34.

[0042] like Figure 2 and Figure 4 As shown, each baffle 3 is provided with two fourth airbag rods 363. One of the fourth airbag rods 363 is connected to the seventh airbag rod 362 in its corresponding baffle 3, and the other fourth airbag rod 363 is connected to the third airbag rod 36 in the upper baffle 3. The lower end of the first air transmission tube 42 is provided with a switching plate 4 for squeezing the fourth airbag rods 363. That is, the switching plate 4 is provided with a through groove that provides a downward passage for each fourth airbag rod 363. Each through groove is provided with a support plate 43 connected to the switching plate 4 by a torsion spring.

[0043] As not shown in the figure, each baffle 3 is equipped with a forward and reverse motor that drives the corresponding first sampling bottle 31 to rotate to open or close.

[0044] The application method of the above-mentioned passive sampler for determining the concentration of antibiotics in river water is as follows:

[0045] First, the first sampling bottle 31 of the low-speed sampling component is opened by the forward and reverse motor to collect water samples. The first sampling bottle 31 rotates clockwise, and the second ratchet 315 drives the fourth ratchet 331 to rotate through the fourth ratchet plate 35, so that the docking hole on the docking plate 334 is connected to the opening of one end of the liquid bladder rod 33, and then the water flows into the liquid bladder rod 33 of the low-speed sampling component. Under the impact of the water flow, a thrust is generated on the other end of the liquid bladder rod 33. The current water flow rate is indicated by the elongation of the liquid bladder rod 33.

[0046] Low speed throughout: When the low speed is maintained, the liquid bladder rod 33 of the low speed sampling component remains in a normal state. The normal state means that the liquid bladder rod 33 is not compressed or extended. After the sampling is completed, the first sampling bottle 31 is closed by the forward and reverse motor.

[0047] The speed gradually increases: After reaching the medium speed state, the liquid bladder rod 33 of the low-speed sampling component expands and extends to its maximum extent. The second ratchet plate 332 drives the first sampling bottle 31 to stop low-speed sampling, and the water pipe 34 moves outward to squeeze the first air bladder rod 41. This causes the first ratchet plate 111 on the second air bladder rod 11 to drive the switching tube 5 to rotate, thereby aligning the notch of the locking ring 52 with the locking block 21 of the highest layer. This causes the medium-speed sampling component to move down to the same sampling position as the low-speed sampling component for sampling. During the downward movement of the medium-speed sampling component, its corresponding stop... The fourth airbag rod 363 on plate 3 is compressed under the resistance of support plate 43, causing the third airbag rod 36 of the low-speed sampling component baffle 3 to extend and push the liquid bladder rod 33 of the low-speed sampling component to reset. At the same time, another fourth airbag rod 363 causes the seventh airbag rod 362 of the medium-speed sampling component to extend, driving the third ratchet plate 361 to move, opening the first sampling bottle 31 of the medium-speed sampling component, and opening the liquid bladder rod 33 for medium-speed sampling. The process is the same after reaching the high-speed state. After sampling is completed, the first sampling bottle 31 is closed by the forward and reverse motor.

[0048] Example 2: This example differs from Example 1 in that, as Figure 7 As shown, a second telescopic rod 6 and a third telescopic rod 7 fixedly connected to the second telescopic rod 6 are rotatably provided on the top plate 1. A second gear 317 is provided at the bottom of the first sampling bottle 31. A sleeve is sequentially sleeved on the telescopic end of the second telescopic rod 6 from the inside to the outside. A third gear 61 that meshes with the corresponding second gear 317 is provided on the sleeve. A connecting rod 62 that connects to the telescopic end of the first telescopic rod 2 is provided on the outermost sleeve.

[0049] The working principle of this embodiment differs from that of Embodiment 1 in that the second telescopic rod 6 is rotated counterclockwise to open the first sampling bottle 31 of the low-speed sampling component through the meshing transmission of the second gear 317 and the third gear 61. After sampling is completed, the first sampling bottle 31 is closed by rotating the second telescopic rod 6 clockwise, thereby reducing the use of electrical components such as forward and reverse motors and reducing energy consumption.

[0050] Example 3: This example differs from Example 2 in that, as Figure 8 As shown, the baffle 3 is provided with a second sampling bottle 32 with the same structure as the first sampling bottle 31. The ring plate 313 of the second sampling bottle 32 is fitted with a first gear 321. The liquid bladder rod 33 is provided with a first toothed plate 333 that meshes with the first gear 321 for transmission. The fourth air bladder rod 363 is provided with a self-locking structure that self-locks after compression. That is, the existing self-locking structure for connecting the mobile phone to the memory card slot can be used.

[0051] like Figure 9 and Figure 10As shown, the top plate 1 is provided with a third toothed plate 12 and a fifth airbag rod 13 with a gap (e.g., 5 cm) with the third toothed plate 12. The fixed end of the second telescopic rod 6 is provided with a fourth gear 63 that meshes with the third toothed plate 12. The switching plate 4 is provided with a sixth airbag rod 44 for pushing the corresponding water pipe 34. The sixth airbag rod 44 is connected to the fifth airbag rod 13 through the second air transmission pipe 45.

[0052] The working principle of this embodiment differs from that of Embodiment 1 in that, before the river accelerates but reaches a medium speed, for example, when the river flow speed is between 0 and 1 / 2 medium speed, the liquid bladder rod 33 of the low-speed sampling component remains in a normal state or extends until the first toothed plate 333 does not contact or mesh with the first gear 321. At this time, only the first sampling bottle 31 is opened, which is one sampling range of the low-speed sampling component. When the river flow speed is between 1 / 2 medium speed and medium speed, the liquid bladder rod 33 of the low-speed sampling component gradually expands and extends until the first toothed plate 333 is used to open the second sampling bottle 32 to sample the river water. This is another range of the low-speed sampling component, which can increase the sampling amount in the low-speed to medium speed sampling range.

[0053] When the medium-speed sampling component is opened, the fourth airbag rod 363 on the baffle 3 of the medium-speed sampling component is squeezed. The fourth airbag rod 363 is locked by the self-locking structure and no longer rebounds, thereby inhibiting the recovery of the liquid bladder rod 33 of the low-speed sampling component under the impact of water flow. After the entire passive sampler has finished sampling, the self-locking structure is manually pressed to restore the fourth airbag rod 363 and the liquid bladder rod 33 to their normal state.

[0054] After the second sampling bottle 32 has finished sampling, the second telescopic rod 6 is rotated clockwise without affecting the closed state of the first sampling bottle 31 (that is, after the liquid bladder rod 33 drives the first sampling bottle 31 to close, the ring plate 313 still has rotational margin to keep the first sampling bottle 31 closed), causing the third toothed plate 12 to squeeze the fifth air bladder rod 13, thereby driving the sixth air bladder rod 44 to push the corresponding water pipe 34, thereby compressing the liquid bladder rod 33 and closing the second sampling bottle 32.

Claims

1. A passive sampler for determining antibiotics in river water, characterized in that, The device includes a top plate (1), a switching telescopic sleeve rod set on the top plate (1), and a high-speed sampling component, a medium-speed sampling component, and a low-speed sampling component set on the switching telescopic sleeve rod from top to bottom. The switching telescopic sleeve rod includes a first telescopic rod (2) and a switching tube (5) sleeved on the first telescopic rod (2). The inner wall of the switching tube (5) is provided with a snap ring (52) corresponding to the height difference between two adjacent sampling components. Each snap ring is provided with a notch and is staggered at an equal angle. The first telescopic rod (2) is provided with a snap block (21) for passing through the notch. The high-speed sampling component, medium-speed sampling component, and low-speed sampling component are all composed of an internally hollow baffle (3), a first sampling bottle (31) rotatably mounted on the baffle (3), a hydraulic component mounted inside the baffle (3) for changing according to the river flow velocity, and a fourth ratchet plate (35) that uses the first sampling bottle (31) to open the hydraulic component. The hydraulic assembly includes a liquid bladder rod (33) for extending according to the water flow rate, a docking plate (334) disposed at one end of the liquid bladder rod (33), and a water pipe (34) disposed at the other end of the liquid bladder rod (33). A third air bladder rod (36) for pushing the water pipe (34) to reset is provided in the baffle (3). A third ratchet plate (361) is provided on one side of the first sampling bottle (31). The third ratchet plate (361) is connected to the baffle (3) through a seventh air bladder rod (362). One end of the liquid bladder rod (33) has an opening, and the other end of the liquid bladder rod (33) has a water passage hole. The top plate (1) is hollow inside, and the upper end of the switching pipe (5) extends into the top plate (1) and is provided with a first ratchet (51). A first ratchet plate (111) is provided on one side of the first ratchet (51). The first ratchet plate (111) is connected to the top plate (1) through a second airbag rod (11). A first air transmission pipe (42) is provided on the top plate (1), and the lower end of the first air transmission pipe (42) is provided with a first airbag rod (41) corresponding to the position of the water pipe (34). Each baffle (3) is provided with two fourth airbag rods (363), one of which is connected to the seventh airbag rod (362) in its corresponding baffle (3), and the other is connected to the third airbag rod (36) in the upper baffle (3). The lower end of the first air transmission pipe (42) is provided with a switching plate (4) for squeezing the fourth airbag rod (363). The first sampling bottle (31) includes a filter cartridge (311), an arc plate (312) fixedly sleeved on the filter cartridge (311), and an annular plate (313) that is sealed and rotated with the arc plate (312). The filter cartridge (311) is filled with an adsorbent for adsorbing antibiotics. The annular plate (313) is provided with through holes (314) for water to pass through. The annular plate (313) of the first sampling bottle (31) is sleeved with a second ratchet (315) and a third ratchet (316) that meshes with a third ratchet plate (361). The liquid bladder rod (33) is provided with a second ratchet plate (332) that meshes with the second ratchet (315). The baffle (3) is provided with a sealing and rotating docking plate (334). One end of the docking plate (334) is provided with a water inlet, and the other end of the docking plate (334) is provided with a docking hole that is rotatably connected to one end of the liquid bladder rod (33). A fourth ratchet (331) is sleeved on the docking plate (334). The fourth ratchet plate (35) is engaged with the second ratchet (315) and the fourth ratchet (331) for transmission.

2. A passive sampler for determining antibiotics in river water according to claim 1, characterized in that, The baffle (3) is provided with a second sampling bottle (32) with the same structure as the first sampling bottle (31). The ring plate (313) of the second sampling bottle (32) is fitted with a first gear (321). The liquid bladder rod (33) is provided with a first toothed plate (333) that meshes with the first gear (321).

3. A passive sampler for determining antibiotics in river water according to claim 1, characterized in that, The top plate (1) is rotatably provided with a second telescopic rod (6) and a third telescopic rod (7) fixedly connected to the second telescopic rod (6). The bottom of the first sampling bottle (31) is provided with a second gear (317). The telescopic end of the second telescopic rod (6) is fitted with a sleeve from the inside to the outside. The sleeve is provided with a third gear (61) that meshes with the corresponding second gear (317). The outermost sleeve is provided with a connecting rod (62) that connects to the telescopic end of the first telescopic rod (2).

4. A passive sampler for determining antibiotics in river water according to claim 2, characterized in that, The top plate (1) is provided with a third toothed plate (12) and a fifth airbag rod (13) with a gap to the third toothed plate (12). The fixed end of the second telescopic rod (6) is provided with a fourth gear (63) that meshes with the third toothed plate (12). The switching plate (4) is provided with a sixth airbag rod (44) for pushing the corresponding water pipe (34). The sixth airbag rod (44) is connected to the fifth airbag rod (13) through the second air transmission pipe (45).

5. A passive sampler for determining antibiotics in river water according to claim 1, characterized in that, The filter cartridge is made of 80-120 mesh stainless steel wire mesh, and the adsorbent is selected from any one of activated carbon, ceramic particles or iron oxide.

6. The application of a passive sampler for determining antibiotics in river water according to any one of claims 1 to 5, characterized in that, The passive sampler was used to determine the concentration of antibiotics in river water.

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