An in-situ sampling device for analysis of pollutants in aquatic animals

Abstract

The application discloses an in-situ sampling device for analyzing pollutants in aquatic animals, and relates to the technical field of biological sampling, and specifically comprises: a sampling platform for placing aquatic animals to be sampled; a support frame arranged on one side of the sampling platform; a collecting module arranged on the support frame through a first adjusting cross rod; a sampler arranged on the support frame through a second adjusting cross rod; and a clamping device arranged on the sampling platform. The sampler is driven to rotate on the sampling platform through the second adjusting cross rod, so that the sampler is moved above the clamping device. The sampler is rotated and pressed to perform ring cutting sampling on the aquatic animals clamped on the clamping device, and the tissue sample cut in the sampler is pushed into a collecting bottle through a pushing mode. The application effectively solves the shortcomings of traditional dissection sampling, meets the selection of different tissue depths and different sampling amounts of aquatic animals, realizes fast, accurate and pollution-free sampling, and provides reliable support for the analysis of pollutants in aquatic animals.

Description

Technical Field

[0001] This invention relates to the field of biological sampling technology, specifically an in-situ sampling device for analyzing pollutants in aquatic animals. Background Technology

[0002] As an indispensable and crucial part of the ecosystem, the aquatic environment is also one of the most fragile and polluted areas within it. Changes in its ecological condition have a profound impact on the entire ecosystem and even human life. In aquatic ecosystems, crustaceans, fish, amphibians, and other aquatic animals at different trophic levels can ingest various pollutants from the water through feeding behaviors, surface contact, and other means. These pollutants threaten the life activities of aquatic animals not only through direct toxic effects (acute and chronic toxicity) but also through indirect toxic mechanisms (developmental toxicity, reproductive toxicity, neurotoxicity, endocrine disruption effects, etc.). Furthermore, aquatic pollutants accumulate and transform within aquatic animals, further transmitting them through the food chain, thus posing potential threats to the health of other organisms and humans. Therefore, achieving rapid and accurate detection of environmental pollution levels is of paramount importance and value for the scientific assessment of pollutant environmental risks. When conducting risk assessments of aquatic animals, the primary task is to accurately determine the content of pollutants within their bodies. Therefore, tissue sampling of aquatic animals is the first step in the scientific assessment of pollutant environmental risks.

[0003] Current sampling methods largely rely on dissection, which involves cutting and preserving aquatic animal tissue samples using scissors and forceps. However, this method has several shortcomings. First, the dissection process requires multiple delicate steps, such as sample recording, target tissue localization, sample cutting, sample size trimming, and sample collection. These steps are time-consuming, especially when facing large sample collection tasks or urgent testing needs, where inefficiency becomes more pronounced, severely impacting the progress of research and testing. Second, sample contamination is a significant concern. During dissection, airborne pollutants and other substances that may be carried on the surface of the dissection tools can contaminate the sample, altering its original composition and pollutant concentration, greatly interfering with subsequent accurate analysis of the actual pollutants within the aquatic animal. Furthermore, the internal structure of aquatic animal tissues is complex, and the distribution of pollutants at different depths and locations may vary. Traditional dissection tools lack the precision required to sample these subtly different areas, resulting in samples that may not accurately reflect the overall contamination status within the tissue, thus affecting the precise assessment of the aquatic animal's contamination level. Finally, for the determination of specific pollutants, such as volatile pollutants, the traditional dissection method involves a long sampling time, resulting in a significant decrease in the actual content of volatile pollutants in the sample, which cannot truly reflect the original pollution situation in aquatic animals. This invention aims to overcome these shortcomings by providing an in-situ sampling device for the analysis of pollutants in aquatic animals, thereby offering a more accurate and reliable solution for the analysis of pollutants in aquatic animals. Summary of the Invention

[0004] This invention provides an in-situ sampling device for analyzing pollutants in aquatic animals, aiming to overcome the shortcomings of existing anatomical sampling methods and achieve rapid, accurate, and pollution-free sampling of pollutants in aquatic animals, providing reliable sample data for environmental pollution assessment and ecological protection.

[0005] To achieve the above objectives, the present invention provides an in-situ sampling device for analyzing pollutants in aquatic animals, comprising: The sampling platform is used to place aquatic animals to be sampled; The support frame is located on one side of the sampling platform; The data acquisition module is mounted on the support frame via the first adjusting crossbar; The sampler is mounted on the support frame via a second adjusting crossbar; A clamp is mounted on the sampling platform; The sampler uses a second adjusting crossbar to push the support frame to rotate on the sampling platform, moving the sampler above the clamp. The sampler rotates and presses to perform circumferential sampling of the aquatic animals clamped on the clamp, and pushes the tissue sample taken in the sampler into the collection bottle.

[0006] The acquisition module includes a camera, a display, and a data storage unit, which are fixedly mounted on the first adjustment crossbar.

[0007] The sampling platform is equipped with a weight sensor; the sampling platform is also equipped with length and width scale lines.

[0008] Preferably, the support frame includes a support rod and a sleeve, with the sleeve fixedly disposed on one side of the sampling platform and the support rod rotatably disposed inside the sleeve; a pre-tightening sleeve is threadedly connected to the end of the sleeve.

[0009] Preferably, the sampler includes a sampling cylinder, a push rod, a sealing plug, and a ring cutter. The sampling cylinder is rotatably mounted at the end of the second adjusting crossbar. The sealing plug is connected to the push rod, and the push rod and the sealing plug are slidably mounted inside the sampling cylinder. The ring cutter is mounted on the sampling port at the lower end of the sampling cylinder.

[0010] It also includes a collar, which is detachably threaded to the second adjusting crossbar; the collar is rotatably sleeved on the sampling cylinder; a fixing ring is provided on the sampling cylinder, and a first spring is sleeved on the sampling cylinder, with a limit ring connected to the end of the first spring, the limit ring being sleeved on the sampling cylinder, and the collar being located between the fixing ring and the limit ring.

[0011] A locking rod is installed inside the second adjusting crossbar. Multiple locking holes are evenly distributed along the circumferential and axial directions on the support rod, and the locking rod is elastically inserted into the locking holes. The second adjusting crossbar is slidably mounted on the support rod via a sliding sleeve. A second spring is connected to the end of the locking rod, located inside the end of the second adjusting crossbar. Paddles are provided on both sides of the end of the locking rod. A first limiting groove and a second limiting groove are provided along the axial direction on the push rod. The first limiting groove and the second limiting groove form a certain angle along the horizontal direction. The upper end of the first limiting groove is connected to the lower end of the second limiting groove through an arc-shaped groove. A protrusion is provided at the upper end of the sampling cylinder; initially, the protrusion is located within the first limiting groove.

[0012] The circumferential cutter is threadedly connected to the sampling cylinder via a connecting cylinder.

[0013] Preferably, the upper end of the first adjusting crossbar is provided with a plurality of insertion holes evenly distributed along the circumference, the first adjusting crossbar is slidably disposed on the upper end of the support rod, and the upper end of the support rod is provided with an elastic insertion rod, which is inserted into the insertion hole.

[0014] Compared with existing technologies, it has the following beneficial effects: 1. Reduced contamination: The sampler of this invention, through the cooperation of the sealing plug and the sampling tube structure, forms a relatively closed environment during the process of cutting and pushing the sample to the collection bottle, effectively isolating external contaminants, ensuring the purity of the sample, and maintaining the original contaminant state of the sample to the greatest extent.

[0015] 2. Precise control of sampling position: The outer wall of the sampling cylinder of the sampler is equipped with high-precision scale lines, which can intuitively and accurately control the sampling depth. In addition, the diameter of the annular cutting blade can be adjusted as needed to meet the precise selection of different tissue depths and different sampling volumes.

[0016] 3. Highly Efficient Sampling: Traditional anatomical methods require meticulous manual cutting and separation of tissues, which is cumbersome and time-consuming, resulting in extremely low efficiency when collecting batches of samples. The in-situ sampling device of this invention significantly reduces the sampling time for a single sample, and can significantly improve overall work efficiency when dealing with large-scale sample collection tasks, meeting the needs of rapid testing. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only preferred embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of an in-situ sampling device for analyzing pollutants in aquatic animals according to this application; Figure 2 This is a schematic diagram of the in-situ sampling device for analyzing pollutants in aquatic animals according to this application; Figure 3 This is a cross-sectional view of the sampler and the second adjusting crossbar of this application; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 for Figure 3 Enlarged view of point B in the middle; Figure 6 This is a schematic diagram of the in-situ sampling device of this application; Figure 7 for Figure 6 Enlarged view of point C in the middle; Figure 8 This is a cross-sectional view of the first adjusting crossbar of this application.

[0019] Reference numerals: 1-Sampling platform; 2-Support frame; 21-Support rod; 22-Sleeve; 211-Lock hole; 3-Acquisition module; 4-Sampler; 41-Sampling cylinder; 42-Push rod; 43-Sealing plug; 44-Ring cutter; 45-Ring; 46-Fixing ring; 47-First spring; 48-Limiting ring; 411-Protrusion; 421-First limiting groove; 422-Second limiting groove; 423-Arc groove; 5-Clamping device; 6-First adjusting crossbar; 61-Insertion hole; 62-Elastic insertion rod; 7-Second adjusting crossbar; 71-Locking rod; 72-Sliding sleeve; 73-Second spring; 711-Pulley. Detailed Implementation To better understand the structure, functional features, and advantages of the present invention, preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings: Example: like Figures 1 to 8 As shown, the present invention provides an in-situ sampling device for analyzing pollutants in aquatic animals, comprising: Sampling platform 1 is the basic component used to place aquatic animals to be sampled and to perform related measurement operations; Support frame 2 is located on one side of sampling platform 1; The acquisition module 3 is mounted on the support frame 2 via the first adjusting crossbar 6; The sampler 4 is mounted on the support frame 2 via the second adjusting crossbar 7, and is used to cut into the tissue of aquatic animals for sampling. A clamping device 5, mounted on the sampling platform 1, is used to clamp and compress aquatic animals. Specifically, the clamping device 5 includes multiple arc-shaped pressure plates, which are adjustablely mounted on the sampling platform 1 via pre-tightening nuts. Rotating the pre-tightening nuts compresses the arc-shaped pressure plates onto the aquatic animals. Furthermore, the arc-shaped pressure plates of this invention are made of adjustable elastic silicone material, with a maximum opening diameter of 20cm and a non-slip textured surface to ensure a secure clamping. The clamping device 5 of this invention is used to fix aquatic animals of different species and sizes, ensuring that the animals maintain a stable position during sampling and preventing the movement of the animals from affecting the accuracy of the sampling.

[0020] The sampler 4 pushes the support frame 2 to rotate on the sampling platform 1 via the second adjusting crossbar 7, so that the sampler 4 moves above the clamp 5. The sampler rotates and presses to perform circumferential sampling of the aquatic animals clamped on the clamp 5, and pushes the tissue sample cut in the sampler into the collection bottle by pushing.

[0021] The acquisition module 3 includes a camera, a display, and a data storage unit, all fixedly mounted on the first adjusting crossbar 6. The camera lens faces the sampling area to capture relevant image information of the aquatic animal surface and the sampling site. The display shows the images captured by the camera in real time, along with operation prompts, measurement data, and other information, allowing operators to intuitively understand the sampling process. The data storage unit stores the images and video data captured by the camera, as well as various parameter data involved in the entire sampling process, providing data support for subsequent analysis and research.

[0022] Specifically, the camera has a resolution of at least 1080p and features automatic recognition and autofocus. The lens surface is treated with an anti-glare and hydrophobic anti-fog coating to ensure image quality under complex lighting conditions. Captured images are transmitted in real-time to the display and data storage unit.

[0023] Specifically, the display uses a 5-10 inch high-contrast, high-resolution OLED screen with a viewing angle of over 170° and multi-touch functionality, making it easy for operators to monitor the sampling process in real time.

[0024] Specifically, the data storage unit uses a large-capacity, high-speed solid-state drive with a read / write speed of no less than 500MB / s. It has an automatic classification and storage function, which automatically archives data based on key information such as sampling time, aquatic animal species, and sampling location, facilitating subsequent rapid retrieval and in-depth analysis.

[0025] The sampling platform 1 is equipped with a weight sensor, which utilizes a high-precision weighing sensor with an accuracy of 0.01g. Employing waterproof and corrosion-resistant encapsulation technology, it can operate stably in humid and harsh environments, accurately measuring the weight of aquatic animals. The sensor is embedded in the sampling platform 1, ensuring a secure connection. Measurement data is transmitted in real-time to the display and data storage unit via wired or wireless means. The sampling platform 1 also features length and width scales. By combining these scales with image recognition from a camera, an accuracy of 0.5mm is achieved. A high-definition camera quickly and accurately measures the length, width, and other dimensional parameters of aquatic animals and uploads the data to the display and data storage unit. Simultaneously, the length measuring device has an automatic calibration function, periodically calibrating the measurement accuracy to ensure data reliability.

[0026] See Figure 3The support frame 2 includes a support rod 21 and a sleeve 22. The sleeve 22 is fixedly mounted on one side of the sampling platform 1, and the support rod 21 is rotatably mounted inside the sleeve 22. A pre-tightening sleeve is threaded to the end of the sleeve 22 to tighten the opening at the end of the sleeve 22, thereby locking the support rod 21 onto the sleeve 22 after adjusting its height and horizontal angle. This allows for stepless adjustment of different angles to meet the needs of different sampling scenarios. The support rod 21 is made of high-strength aluminum alloy, possessing excellent strength and corrosion resistance. The telescopic design of the support rod 21 and the sleeve 22 allows for length adjustment between 20-100cm to accommodate different types and sizes of aquatic animals.

[0027] As another embodiment of the present invention, such as Figure 4 As shown, the sampler 4 of the present invention includes a sampling cylinder 41, a push rod 42, a sealing plug 43, and a ring cutter 44. The sampling cylinder 41 is rotatably disposed at the end of the second adjusting crossbar 7. The sealing plug 43 is connected to the push rod 42. The push rod 42 and the sealing plug 43 are slidably disposed inside the sampling cylinder 41. The ring cutter 44 is disposed on the sampling port at the lower end of the sampling cylinder 41. The blade of the ring cutter 44 has a serrated structure.

[0028] When the sampler 4 of the present invention pushes the sample, it ensures that the sample can be transported to the collection bottle in a relatively sealed environment, preventing sample leakage and the introduction of external contaminants.

[0029] The sampling cylinder 41 is equipped with scale lines, which allows for intuitive and precise control of the sampling depth. Furthermore, the diameter of the annular cutting blade can be adjusted as needed, satisfying the precise selection of different tissue depths and different sampling volumes.

[0030] The circumferential cutter 44 is equipped with serrations to facilitate its rotation and cutting into the aquatic animal tissue.

[0031] Specifically, the sampling cylinder 41 of this invention is made of lightweight, high-strength stainless steel with a wall thickness of 0.5-1mm. The inner wall is smooth to prevent sample damage from friction, and the outer wall has a scale accuracy of 0.1mm to indicate the sampling depth. The sleeve diameter is adjustable between 10-30mm. The bottom annular cutting blade 44 of the sampling cylinder 41 is made of medical-grade cobalt-chromium alloy, which undergoes vacuum heat treatment and precision grinding. The blade has high hardness, strong wear resistance, and is extremely sharp. The cutting edge is micro-serrated, which can effectively reduce cutting slippage. The annular diameter of the annular cutting blade 44 can be precisely adjusted within the range of 10-30mm to adapt to different aquatic animal shapes and sampling needs.

[0032] Specifically, the push rod 42 of this invention is made of stainless steel with a chrome-plated surface and has a diameter of 8 mm to improve surface hardness and wear resistance. One end of the push rod 42 is tightly connected to the sealing plug 43 by threads to ensure a stable connection when pushing the sample and to prevent leakage.

[0033] Specifically, the sealing plug 43 of the present invention is made of food-grade silicone, which is soft and elastic with a Shore hardness of 40-60HA. When the sample is pushed into the collection bottle, it can fit tightly against the inner wall of the sampling tube 41 to form a reliable seal and ensure the integrity of the sample.

[0034] See Figure 4 The present invention also includes a collar 45, which is detachably threadedly connected to the second adjusting crossbar 7; the collar 45 is rotatably sleeved on the sampling cylinder 41; a fixing ring 46 is provided on the sampling cylinder 41, and a first spring 47 is sleeved on the sampling cylinder 41. A limiting ring 48 is connected to the end of the first spring 47, and the limiting ring 48 is sleeved on the sampling cylinder 41. The collar 45 is located between the fixing ring 46 and the limiting ring 48.

[0035] See Figure 5 The second adjusting crossbar 7 of the present invention is provided with a locking rod 71. Multiple locking holes 211 are evenly distributed along the circumferential and axial directions on the support rod 21. The locking rod 71 is elastically inserted into the locking holes 211. The second adjusting crossbar 7 is slidably disposed on the support rod 21 through a sliding sleeve 72. A second spring 73 is connected to the end of the locking rod 71. The second spring 73 is located inside the end of the second adjusting crossbar 7. Paddles 711 are provided on both sides of the end of the locking rod 71.

[0036] See Figure 7 The push rod 42 of this invention is provided with a first limiting groove 421 and a second limiting groove 422 along the axial direction. The first limiting groove 421 and the second limiting groove 422 are at a certain angle along the horizontal direction. The upper end of the first limiting groove 421 is connected to the lower end of the second limiting groove 422 through an arc-shaped groove 423. The upper end of the sampling cylinder 41 is provided with a protrusion 411. In the initial state, the protrusion 411 is located in the first limiting groove 421. By setting the first limiting groove 421, the push rod 42 can drive the sampling cylinder 41 to rotate on the collar 45 when it rotates.

[0037] The first limiting groove 421 and the second limiting groove 422 of the present invention are used for the push rod 42 to push the sealing plug 43 to move within the sampling cylinder 41. By providing an arc-shaped groove 423, when the push rod 42 moves downward along the first limiting groove 421, the protrusion 411 enters the arc-shaped groove 423. By rotating the push rod 42 counterclockwise, the sampling cylinder 41 can rotate synchronously. Simultaneously, the existence of the arc-shaped groove 423 allows the push rod 42 to push the sampling cylinder 41 to compress the first spring 47 for vertical movement, thereby achieving the rotation and descent of the ring cutter 44 to cut aquatic animal tissue. The angle between the first limiting groove 421 and the second limiting groove 422 in the horizontal direction is 60-120 degrees, preferably 90 degrees.

[0038] In another embodiment of the present invention, the circumferential cutting blade 44 is threadedly connected to the sampling cylinder 41 via a connecting cylinder, so as to allow the replacement of circumferential cutting blades 44 and connecting cylinders with different diameters and sampling diameters via the connecting cylinder.

[0039] As another embodiment of the present invention, such as Figure 8 As shown, the first adjusting crossbar 6 of the present invention has a plurality of insertion holes 61 evenly distributed circumferentially on its upper end. The first adjusting crossbar 6 is slidably disposed on the upper end of the support rod 21. An elastic insertion rod 62 is disposed on the upper end of the support rod 21, and the elastic insertion rod 62 is inserted into the insertion hole 61. Specifically, the elastic insertion rod 62 is movably disposed on the upper part of the support rod 21 by means of a spring. By pulling the elastic insertion rod 62 upward, the spring is compressed, thereby disengaging the elastic insertion rod 62 from the insertion hole 61, so that the first adjusting crossbar 6 can slide linearly on the upper part of the support rod 21. Further, in order to prevent the first adjusting crossbar 6 from rotating on the upper part of the support rod 21, a strip-shaped limiting groove is provided axially on the lower part of the first adjusting crossbar 6, and a limiting protrusion is provided on the support rod 21 to slide and engage with the strip-shaped limiting groove to limit the first adjusting crossbar 6.

[0040] The sampling steps of this invention are as follows: Step 1: Place the aquatic animal to be sampled on sampling platform 1. The operator slowly adjusts the arc-shaped structure of clamp 5 according to the size of the aquatic animal, so that it gently embraces the aquatic animal and ensures that it remains stable during the sampling process; Step Two: After the aquatic animal is secured, adjust the height and angle of the support rod 21, as well as the extension of the first adjusting crossbar 6, based on real-time images of the animal's body surface captured by the camera. The animal's weight is quickly and accurately measured using the weight sensor on the sampling platform 1, and the data is transmitted to the display and data storage unit in real time. Simultaneously, the camera, in conjunction with length and width scale lines, rapidly and accurately measures the animal's length, width, and other dimensional parameters, and transmits this data instantly to the display and data storage unit, providing crucial reference for subsequent data analysis.

[0041] Step 3: Based on the determined sampling location and the shape of the aquatic animal, select a suitable sampling tube 41 and install it on the first adjusting crossbar 6. Assemble the sampler 4, insert the push rod 42 into the sleeve, ensuring smooth fit between the two, and check the firmness of the connection between the thread at one end of the push rod 42 and the sealing plug 43. Install the ring cutter 44 to the bottom of the sampling tube 41.

[0042] Step 4: Precisely align the bottom ring cutter 44 of the sampling tube 41 with the predetermined sampling location. Next, rotate the knob at the upper end of the push rod 42, causing the push rod 42 to rotate through the first limiting groove 421, thus allowing the ring cutter 44 to rotate and cut into the aquatic animal tissue. After cutting, smoothly push the push rod 42, using the sealing plug 43 to smoothly advance it inside the sleeve, pushing the cut tissue sample into the pre-prepared collection bottle.

[0043] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technology of the present invention without departing from the scope of the present invention are within the protection scope of the present invention.

Claims

1. An in-situ sampling device for analyzing pollutants in aquatic animals, characterized in that, include: Sampling platform (1) is used to place aquatic animals to be sampled; A support frame (2) is provided on one side of the sampling platform (1); The acquisition module (3) is mounted on the support frame (2) via the first adjusting crossbar (6); The sampler (4) is mounted on the support frame (2) via the second adjusting crossbar (7); A clamp (5) is provided on the sampling platform (1); The sampler (4) pushes the support frame (2) to rotate on the sampling platform (1) by the second adjusting crossbar (7), so that the sampler (4) moves above the clamp (5). The sampler (4) rotates and presses to perform circumferential cutting sampling of aquatic animals clamped on the clamp (5), and pushes the tissue sample cut in the sampler (4) into the collection bottle by pushing. The sampler (4) includes a sampling cylinder (41), a push rod (42), a sealing plug (43), and a ring cutter (44). The sampling cylinder (41) is rotatably mounted on the end of the second adjusting crossbar (7). The sealing plug (43) is connected to the push rod (42). The push rod (42) and the sealing plug (43) are slidably mounted inside the sampling cylinder (41). The ring cutter (44) is mounted on the sampling port at the lower end of the sampling cylinder (41). The push rod (42) is provided with a first limiting groove (421) and a second limiting groove (422) along the axial direction. The first limiting groove (421) and the second limiting groove (422) form a certain angle in the horizontal direction. The upper end of the first limiting groove (421) is connected to the lower end of the second limiting groove (422) through an arc groove (423). The upper end of the sampling cylinder (41) is provided with a protrusion (411). In the initial state, the protrusion (411) is located in the first limiting groove (421). It also includes a collar (45), which is detachably threaded to the second adjusting crossbar (7); the collar (45) is rotatably sleeved on the sampling cylinder (41); a fixing ring (46) is provided on the sampling cylinder (41), and a first spring (47) is sleeved on the sampling cylinder (41). A limiting ring (48) is connected to the end of the first spring (47), and the limiting ring (48) is sleeved on the sampling cylinder (41). The collar (45) is located between the fixing ring (46) and the limiting ring (48).

2. The in-situ sampling device for analyzing pollutants in aquatic animals according to claim 1, characterized in that, The acquisition module (3) includes a camera, a display and a data storage unit, which are fixedly mounted on the first adjusting crossbar (6).

3. The in-situ sampling device for analyzing pollutants in aquatic animals according to claim 2, characterized in that, The support frame (2) includes a support rod (21) and a sleeve (22). The sleeve (22) is fixedly installed on one side of the sampling platform (1), and the support rod (21) is rotatably installed inside the sleeve (22). A pre-tightening sleeve is threaded to the end of the sleeve (22).

4. The in-situ sampling device for analyzing pollutants in aquatic animals according to claim 3, characterized in that, The second adjusting crossbar (7) is provided with a locking rod (71), and the support rod (21) is provided with a plurality of locking holes (211) evenly distributed along the circumferential and axial directions. The locking rod (71) is elastically inserted into the locking holes (211). The second adjusting crossbar (7) is slidably disposed on the support rod (21) through a sliding sleeve (72). The end of the locking rod (71) is connected to a second spring (73), which is located inside the end of the second adjusting crossbar (7). The locking rod (71) is provided with paddles (711) on both sides of the end of the locking rod (71).

5. The in-situ sampling device for analyzing pollutants in aquatic animals according to claim 4, characterized in that, The ring cutter (44) is threadedly connected to the sampling cylinder (41) via a connecting cylinder.

6. The in-situ sampling device for analyzing pollutants in aquatic animals according to claim 1, characterized in that, The sampling platform (1) is equipped with a weight sensor; the sampling platform (1) is also equipped with length scale lines and width scale lines.

7. The in-situ sampling device for analyzing pollutants in aquatic animals according to claim 3, characterized in that, The first adjusting crossbar (6) has a plurality of insertion holes (61) evenly distributed around its upper end. The first adjusting crossbar (6) is slidably disposed on the upper end of the support rod (21). The upper end of the support rod (21) is provided with an elastic insertion rod (62), which is inserted into the insertion hole (61).

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