Chemical pesticide water-sediment system metabolism experiment device

Abstract

The invention discloses a metabolism experiment device for a chemical pesticide water-sediment system. The metabolism experiment device comprises a box body, a culture assembly arranged in the box body, a reaction assembly arranged on the culture assembly, an adjusting assembly arranged in the box body and connected with the reaction assembly, and a gas chromatograph-mass spectrometer arranged at the top end of the box body, the device is reasonable in structural design, can accurately control key environmental parameters such as temperature, dissolved oxygen and pH value, simulates various natural environments such as aerobic environment and anaerobic environment, provides reliable environmental conditions for the research of the metabolic process of chemical pesticides, can be suitable for the metabolic research of different types of chemical pesticides in different water-sediment systems, and has wide application prospects. And reliable data support is provided for environmental risk assessment of pesticides.

Description

Technical Field

[0001] This invention relates to the field of experimental equipment technology, specifically to an experimental apparatus for the metabolism of chemical pesticide water-sediment systems. Background Technology

[0002] Chemical pesticides, as a crucial means of controlling pests and diseases and ensuring grain yield in agricultural production, inevitably lead to some residues entering natural aquatic environments such as rivers, lakes, and wetlands through agricultural runoff, soil leaching, and atmospheric deposition. In natural aquatic ecosystems, the water-sediment system is one of the core fate sites for pesticide residues. Within this system, pesticides undergo complex physical, chemical, and biological metabolic behaviors, including adsorption-desorption between the aqueous phase and sediment, microbial-mediated biodegradation, chemical transformations such as hydrolysis / oxidation / reduction, and interfacial migration and diffusion. These metabolic processes directly determine the environmental persistence, bioaccumulation, and ecological risks of pesticides, and are the core basis for assessing the environmental safety of pesticides, formulating pesticide use standards, and developing pollution remediation plans. Therefore, accurately revealing the metabolic patterns of chemical pesticides in the water-sediment system has significant theoretical and practical implications for agricultural ecological environmental protection, agricultural product quality and safety, and ecological risk prevention and control. Currently, experimental devices used for studying the metabolism of chemical pesticides in water-sediment systems generally suffer from technical problems such as inaccurate environmental simulation, unscientific sampling processes, low functional integration, and narrow applicability. These problems result in insufficient reliability of experimental data, low research efficiency, and difficulty in meeting the actual needs of precise research on pesticide environmental behavior and ecological risk assessment. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a chemical pesticide water-sediment system metabolic experimental device.

[0004] The technical solution of the present invention is as follows: a chemical pesticide water-sediment system metabolic experimental device, comprising a box, a culture component disposed inside the box, a reaction component disposed on the culture component, an adjustment component disposed inside the box and connected to the reaction component, and a gas chromatograph-mass spectrometer disposed at the top of the box; the box includes an insulated box and a storage box disposed on a base; both the insulated box and the storage box are movably hinged with a door; The cultivation component includes a water bath at the bottom of the incubator, an electric heating tube at the bottom of the water bath, and a light shield that is movable and clipped inside the incubator and fitted outside the water bath; a perforated plate is installed inside the water bath and above the electric heating tube, and several card holders are evenly distributed on the upper surface of the perforated plate. The reaction assembly includes a reaction flask and a sediment holder that is movably snapped into the bottom of the reaction flask; a sealing cap is movably snapped into the top of the reaction flask, and several connecting branches are provided on the outer wall of the reaction flask; several reaction flasks are provided, and each reaction flask is movably snapped into another reaction flask. The assembly includes an oxygen cylinder, a nitrogen cylinder, a first absorption bottle, a second absorption bottle, and a third absorption bottle, which are respectively movably snapped into the storage box; the oxygen cylinder and the nitrogen cylinder are respectively connected to the connecting branch pipes on each reaction bottle through conduits; the first absorption bottle, the second absorption bottle, and the third absorption bottle are connected to each other in sequence through conduits, and the first absorption bottle is connected to the connecting branch pipe on the reaction bottle through a conduit. The gas chromatograph-mass spectrometer is located on top of the storage box.

[0005] Furthermore, a temperature sensor is installed inside the water bath, and a temperature controller is installed on the outer wall of the water bath, which is electrically connected to the temperature sensor and the electric heating tube respectively. Description: The water temperature inside the water bath is monitored in real time by a temperature sensor, and the water temperature is precisely controlled by a temperature controller, providing a realistic environmental condition for the study of chemical pesticide metabolism processes.

[0006] Furthermore, the inside of the insulated box is equipped with guide rods that slide and engage with the light shield and lifting screws that are threadedly connected to the light shield on both sides. The top of the insulated box is equipped with lifting motors that provide power to the two lifting screws respectively. Explanation: The lifting motor drives the lifting screw to rotate, causing the sunshade to move up and down along the guide rod under the action of the lifting screw. This facilitates the control of opening and closing the sunshade and helps improve work efficiency.

[0007] Furthermore, the insulated box is equipped with a limiting component that connects to the light shield. The limiting component includes a connecting bracket set at the top of the light shield and a limiting plate set at the top of the insulated box that can be movably engaged with the connecting bracket set. The outer wall of the connecting bracket set is provided with an annular groove. Several limiting rods are slidably engaged with the inner side of the limiting plate, and the limiting plate is equipped with locking springs that abut against each of the limiting rods. Note: When the sunshade moves to the top of the insulated box, the connecting bracket aligns with the limiting bracket. At this time, the limiting rod engages with the annular groove on the connecting bracket under the action of the locking spring, preventing the sunshade from accidentally slipping off.

[0008] Furthermore, each of the limiting rods has a roller rotatably engaged at the opposite end; the top of the connecting bracket is rounded. Note: By installing rollers at the end of the limit rod, the convenience of docking the limit rod with the connecting seat is improved.

[0009] Furthermore, an agitator screw is rotatably engaged inside the water bath and between several adjacent mounting brackets. The end of each agitator screw penetrates the water bath and is connected to a sprocket. Two sprockets spaced apart from each other are connected by a chain drive. A circulating motor that provides power to one of the agitators is installed on the outer wall of the water bath. Note: When using this method, the circulating motor drives one of the agitators to rotate, causing the two adjacent agitators to rotate in opposite directions. This improves the fluidity of the water inside the water bath, ensuring that the water temperature remains consistent throughout the bath and thus enhancing the reliability of the experimental results.

[0010] Furthermore, the bottom of the sunshade is provided with a pressure seat that can abut against each of the sealing covers, and a clamping spring that abuts against each of the pressure seats is movably engaged inside the sunshade. Note: When the light shield is placed outside the water bath, the pressure seat abuts against the upper end of the corresponding sealing cap, which helps to improve the tightness of the connection between the sealing cap and the reaction flask.

[0011] Furthermore, a hollow tube is movably engaged at the top of the sediment support, and a sediment sampling component is installed inside the hollow tube. The sediment sampling component includes a pull rod sleeved inside the hollow tube, a sampling tube located at the bottom of the pull rod, and a closed sleeve slidably engaged inside the sampling tube. Several guide discs are sleeved on the pull rod and slidably engaged with the inner wall of the hollow tube. The two ends of the sampling tube are closed, and several sampling slots are evenly distributed at the lower position of the outer wall of the sampling tube. The bottom end of the closed sleeve is open, and a pull rope penetrating the pull rod is installed at the top of the closed sleeve. A return spring is installed at the top of the closed sleeve and sleeved outside the pull rope. Instructions: When collecting sediment samples to test the metabolic efficiency of chemical pesticides in sediments, use the pull rod to push the sampling tube into the sediment. Pull the rope to move the closed sleeve upward inside the sampling tube and rotate the pull rod. At this time, the sediment sample enters the sampling tube through the sampling slot. Finally, use the pull rod to pull the sampling tube out of the hollow tube.

[0012] Furthermore, inclined plates are provided on the outer wall of the sampling tube and at positions corresponding to each sampling slot; a pointed tip is provided at the bottom of the sampling tube. Explanation: By setting an inclined plate on the outer wall of the sampling tube, the sediment sample can be quickly entered into the sampling tube during the rotation of the sampling tube; and by setting a tip at the bottom of the sampling tube, the sampling tube can be quickly inserted into the sediment.

[0013] Furthermore, a liquid phase collection tube is installed inside the reaction flask and above the sediment support via a tube seat. A telescopic tube is sleeved inside the liquid phase collection tube, and an adjusting push rod connected to the telescopic tube is slidably engaged on the tube seat. Instructions: When using this device, use the adjusting lever to move the telescopic tube on the liquid phase collection tube to facilitate the collection of water samples at different depths, which helps improve the accuracy of chemical pesticide metabolite detection.

[0014] The working principle of this invention is as follows: When using, add sediment samples into the sediment holder, then add water samples into the reaction bottle and seal the bottle; add NaOH solution, ethylene glycol solution and H2SO4 solution into the first absorption bottle, second absorption bottle and third absorption bottle respectively. The reaction flask is placed on the holder on the surface of the perforated plate, and the test pesticide is added into the reaction flask through one of the connecting branches. Finally, the water in the water bath is heated to 20°C using an electric heating tube, and the light shield is placed on the outside of the water bath to keep the reaction flask in a dark environment. During the experiments, in the aerobic metabolism experiment, oxygen from the oxygen cylinder was introduced into the reaction flask to maintain a dissolved oxygen concentration of 7-10 mg / L; in the anaerobic metabolism experiment, nitrogen from the nitrogen cylinder was introduced into the reaction flask to maintain a redox potential of less than 100 mV for the water and sediment inside the reaction flask; CO2 generated during the experiment was absorbed using NaOH solution, volatile organic compounds generated during the experiment were absorbed using ethylene glycol solution, and alkaline volatile substances generated during the experiment were absorbed using NaOH solution. After the experiment, water and sediment samples were collected from the reaction bottle, and the concentrations of the tested pesticides and metabolites in the water and sediment samples were detected by gas chromatography-mass spectrometry.

[0015] Compared with the prior art, the beneficial effects of the present invention are reflected in the following aspects: First, the present invention has a reasonable structural design, which can accurately control key environmental parameters such as temperature, dissolved oxygen, and pH value, and simulate various natural environments such as aerobic and anaerobic environments. It provides reliable environmental conditions for the study of chemical pesticide metabolism processes, and can be applied to the metabolic study of different types of chemical pesticides in different water-sediment systems, providing reliable data support for pesticide environmental risk assessment. Secondly, by setting an agitation spiral inside the water bath, the present invention can improve the fluidity of the water inside the water bath, so that the water temperature in various areas inside the water bath remains consistent, which is beneficial to improving the reliability of the experimental results. Third, the device of the present invention can collect water and sediment samples at different depths separately, effectively avoiding cross-contamination during the sampling process and ensuring the accuracy of chemical pesticide metabolite detection. Attached Figure Description

[0016] Figure 1 This is a longitudinal sectional view of the present invention; Figure 2This is a schematic diagram showing the connection between the electric heating element and the water bath of the present invention; Figure 3 This is a schematic diagram showing the connection between the light shield and the insulated box of the present invention; Figure 4 This is a schematic diagram of the structure of the limiting component of the present invention; Figure 5 This is a schematic diagram of the internal structure of the reaction flask of the present invention; Figure 6 This is a schematic diagram of the sediment sampling component of the present invention; Figure 7 This is a schematic diagram of the sampling tube of the present invention; Figure 8 This is a schematic diagram of the connection between the telescopic tube and the liquid phase collection tube of the present invention; Figure 9 This is a schematic diagram of the structure of the adjustment component of the present invention; Figure 10 This is a schematic diagram showing the connection between the stirring spiral and the water bath of the present invention; Among them, 1-box body, 10-insulation box, 11-storage box, 2-culture component, 20-water bath, 21-electric heating tube, 22-light shield, 220-guide rod, 221-lifting screw, 23-mesh plate, 230-card seat, 24-temperature controller, 25-lifting motor, 26-limiting component, 260-connecting card seat, 2600-annular slot, 261-limiting chuck, 262-limiting rod, 2620-locking spring, 2621-roller, 3-reaction component, 30-reaction bottle, 300-sealing cap, 301-connecting branch pipe, 31-sediment bracket, 310-hollow tube, 3 2-Sediment sampling component, 320-Pull rod, 321-Sampling tube, 3210-Sampling slot, 3211-Inclined plate, 3212-Tip, 322-Sealing sleeve, 323-Guide plate, 324-Pull rope, 325-Reset spring, 33-Liquid phase collection tube, 330-Tube seat, 331-Telescopic tube, 332-Adjusting push rod, 4-Adjusting assembly, 40-Oxygen cylinder, 41-Nitrogen cylinder, 42-First absorption bottle, 43-Second absorption bottle, 44-Third absorption bottle, 5-Gas chromatograph-mass spectrometer, 6-Stirring screw, 60-Sprocket, 61-Circulating motor, 7-Pressure seat, 70-Compression spring. Detailed Implementation

[0017] Example 1 like Figure 1The apparatus shown is a chemical pesticide water-sediment system metabolic experimental device, including a box 1, a culture component 2 disposed inside the box 1, a reaction component 3 disposed on the culture component 2, an adjustment component 4 disposed inside the box 1 and connected to the reaction component 3, and a gas chromatograph-mass spectrometer 5 disposed at the top of the box 1; the box 1 includes an insulated box 10 and a storage box 11 disposed on a base; both the insulated box 10 and the storage box 11 are hinged to doors; like Figure 1 , 10 As shown, the cultivation component 2 includes a water bath 20 disposed at the bottom of the incubator 10, an electric heating tube 21 disposed at the bottom of the water bath 20, and a light shield 22 that is movably snapped into the inside of the incubator 10 and fitted onto the outside of the water bath 20; a perforated plate 23 is disposed inside the water bath 20 and above the electric heating tube 21, and nine card holders 230 are evenly distributed on the upper surface of the perforated plate 23; the electric heating tube 21 adopts a product of existing technology, such as a finned heating tube produced by Jiangsu Shenli Power Technology Co., Ltd. like Figure 1 , 5 As shown, the reaction assembly 3 includes a reaction bottle 30 and a sediment holder 31 that is movably snapped into the bottom of the reaction bottle 30; a sealing cap 300 is movably snapped into the top of the reaction bottle 30, and several connecting branches 301 are provided on the outer side wall of the reaction bottle 30; there are 9 reaction bottles 30, and each reaction bottle 30 is movably snapped into another reaction bottle 30. like Figure 9 As shown, the assembly 4 includes an oxygen cylinder 40, a nitrogen cylinder 41, a first absorption bottle 42, a second absorption bottle 43, and a third absorption bottle 44, which are respectively movably attached inside the storage box 11; the oxygen cylinder 40 and the nitrogen cylinder 41 are respectively connected to the connecting branch pipes 301 on each reaction bottle 30 through conduits; the first absorption bottle 42, the second absorption bottle 43, and the third absorption bottle 44 are connected in sequence through conduits, and the first absorption bottle 42 is connected to the connecting branch pipe 301 on the reaction bottle 30 through a conduit; like Figure 1 As shown, the gas chromatograph-mass spectrometer 5 is located at the top of the storage box 11. The gas chromatograph-mass spectrometer 5 is a product using existing technology, such as the GC-MS6800 gas chromatograph-mass spectrometer manufactured by Tianrui Instruments Co., Ltd.

[0018] Example 2 The difference between this embodiment and Embodiment 1 is that: like Figure 2As shown, a temperature sensor (commercially available product) is installed inside the water bath 20, and a temperature controller 24 is installed on the outer wall of the water bath 20, which is electrically connected to the temperature sensor and the electric heating tube 21 respectively. The temperature controller 24 adopts the BWDK-S201D dry-type temperature controller produced by Fuzhou Inno Electronics Technology Co., Ltd. The temperature sensor senses the heating temperature of the water inside the water bath in real time, and the temperature controller 24 is used to accurately control the water temperature, providing a real environmental condition for the study of chemical pesticide metabolism process.

[0019] Example 3 The difference between this embodiment and Embodiment 2 is that: like Figure 1 , 3 As shown, the inside of the heat preservation box 10 is provided with guide rods 220 that are slidably engaged with the light shield 22 and lifting screws 221 that are threadedly connected to the light shield 22 on both sides. The top of the heat preservation box 10 is provided with lifting motors 25 (commercially available products) that provide power to the two lifting screws 221 respectively. The lifting motors 25 drive the lifting screws 221 to rotate, so that the light shield 22 moves up and down along the guide rods 220 under the action of the lifting screws 221, thereby facilitating the control of the opening and closing of the light shield 22 and improving work efficiency.

[0020] Example 4 The difference between this embodiment and embodiment 3 is that: like Figure 1 , 4 As shown, the insulated box 10 is equipped with a limiting component 26 connected to the light shield 22. The limiting component 26 includes a connecting bracket 260 located at the top of the light shield 22 and a limiting plate 261 located at the top of the insulated box 10 and capable of being movably engaged with the connecting bracket 260. An annular groove 2600 is provided on the outer wall of the connecting bracket 260. Several limiting rods 262 are slidably engaged with the inner side of the limiting plate 261. The limiting plate 261 is equipped with various limiting rods 262 respectively engaged with each limiting rod 262. Each limiting rod 262 abuts against a locking spring 2620; each limiting rod 262 has a roller 2621 rotatably engaged at the opposite end; the top of the connecting bracket 260 is rounded; when the light shield 22 moves to the top of the insulation box 10, the connecting bracket 260 engages with the limiting plate 261, and at this time, the limiting rod 262 is engaged and locked with the annular groove 2600 on the connecting bracket 260 under the action of the locking spring 2622, so as to prevent the light shield 22 from accidentally slipping off.

[0021] Example 5 The difference between this embodiment and embodiment 4 is that: like Figure 10As shown, agitator spirals 6 are rotatably engaged inside the water bath 20 and between several adjacent mounting brackets 230. The ends of each agitator spiral 6 penetrate the water bath 20 and are connected to sprockets 60. Two sprockets 60 spaced apart are connected by chain drive. A circulating motor 61 (commercially available product) is provided on the outer wall of the water bath 20 to power one of the agitator spirals 6. The circulating motor 61 drives one of the agitator spirals 6 to rotate, causing two adjacent agitator spirals 6 to rotate in opposite directions. This improves the fluidity of the water inside the water bath 20, keeps the water temperature in all areas of the water bath 20 consistent, and helps improve the reliability of the experimental results.

[0022] Example 6 The difference between this embodiment and embodiment 5 is that: like Figure 1 As shown, the bottom of the light shield 22 is provided with a pressure seat 7 that can abut against each of the sealing caps 300. The light shield 22 is movably engaged with a compression spring 70 that abuts against each of the pressure seats 7. When the light shield 22 is fitted outside the water bath 20, the pressure seat 7 abuts against the upper end of the corresponding sealing cap 300, which helps to improve the tightness of the connection between the sealing cap 300 and the reaction bottle 30.

[0023] Example 7 The difference between this embodiment and embodiment 6 is that: like Figure 5 , 6As shown in Figure 7, a hollow tube 310 is movably engaged at the top of the sediment support 31, and a sediment sampling component 32 is disposed inside the hollow tube 310. The sediment sampling component 32 includes a pull rod 320 sleeved inside the hollow tube 310, a sampling cylinder 321 disposed at the bottom end of the pull rod 320, and a closed sleeve 322 slidably engaged inside the sampling cylinder 321. Several guide discs 323 are sleeved on the pull rod 320 and are slidably engaged with the inner wall of the hollow tube 310. The two ends of the sampling cylinder 321 are closed, and three sampling slots 3210 are equidistantly distributed on the lower part of the outer wall of the sampling cylinder 321. Inclined plates 3211 are disposed on the outer wall of the sampling cylinder 321 at positions corresponding to the positions of each sampling slot 3210. The sample tube 321 has a pointed tip 3212 at its bottom end; the bottom end of the closed sleeve 322 is open, and the top end of the closed sleeve 322 is provided with a pull rope 324 that passes through the pull rod 320; the top end of the closed sleeve 322 is provided with a return spring 325 sleeved on the outside of the pull rope 324; when it is necessary to collect sediment samples to detect the metabolic efficiency of chemical pesticides in sediments, the pull rod 320 is used to push the sampling tube 321 into the sediment, the pull rope 324 is used to pull the closed sleeve 322 upward inside the sampling tube 321, and the pull rod 320 is rotated. At this time, the sediment sample enters the sampling tube 321 through the sampling slot 3210, and finally the sampling tube 321 is pulled out from the hollow tube 310 by the pull rod 320.

[0024] Example 8 The difference between this embodiment and embodiment 7 is that: like Figure 8 As shown, a liquid phase collection tube 33 is installed inside the reaction flask 30 and above the sediment support 31 via a tube seat 330. A telescopic tube 331 is sleeved inside the liquid phase collection tube 33. An adjusting push rod 332 connected to the telescopic tube 331 is slidably engaged on the tube seat 330. The adjusting push rod 332 is used to push the telescopic tube 331 to move on the liquid phase collection tube 33, which facilitates the collection of water samples at different depths and helps to improve the accuracy of chemical pesticide metabolite detection.

Claims

1. A chemical pesticide water-sediment system metabolic experimental apparatus, characterized in that, The system includes a housing (1), a culture component (2) disposed inside the housing (1), a reaction component (3) disposed on the culture component (2), an adjustment component (4) disposed inside the housing (1) and connected to the reaction component (3), and a gas chromatograph-mass spectrometer (5) disposed at the top of the housing (1); the housing (1) includes an insulated box (10) and a storage box (11) disposed on a base. The culture component (2) includes a water bath (20) located at the bottom of the incubator (10), an electric heating tube (21) located at the bottom of the water bath (20), and a light shield (22) that is movably snapped into the incubator (10) and fitted onto the outside of the water bath (20); a perforated plate (23) is provided inside the water bath (20) and above the electric heating tube (21). The reaction assembly (3) includes a reaction bottle (30) and a sediment holder (31) that is movably snapped into the bottom of the reaction bottle (30); a sealing cap (300) is movably snapped into the top of the reaction bottle (30). The section assembly (4) includes an oxygen cylinder (40), a nitrogen cylinder (41), a first absorption bottle (42), a second absorption bottle (43), and a third absorption bottle (44), which are respectively movably snapped into the storage box (11); the oxygen cylinder (40) and the nitrogen cylinder (41) are respectively connected to each reaction bottle (30); the first absorption bottle (42), the second absorption bottle (43), and the third absorption bottle (44) are connected in sequence by conduits, and the first absorption bottle (42) is connected to the reaction bottle (30); The gas chromatograph-mass spectrometer (5) is located on top of the storage box (11).

2. The chemical pesticide water-sediment system metabolic experimental apparatus according to claim 1, characterized in that, A temperature sensor is installed inside the water bath (20), and a temperature controller (24) is installed on the outer wall of the water bath (20) and is electrically connected to the temperature sensor and the electric heating tube (21).

3. The chemical pesticide water-sediment system metabolic experimental apparatus according to claim 1, characterized in that, The heat preservation box (10) has guide rods (220) that are slidably engaged with the light shield (22) and lifting screws (221) that are threadedly connected to the light shield (22) on both sides of its interior. The heat preservation box (10) has lifting motors (25) that provide power to the two lifting screws (221) respectively.

4. The chemical pesticide water-sediment system metabolic experimental apparatus according to claim 1, characterized in that, The heat preservation box (10) is provided with a limiting component (26) connected to the light shield (22). The limiting component (26) includes a connecting bracket (260) provided at the top of the light shield (22) and a limiting chuck (261) provided at the top of the heat preservation box (10) and capable of being movably engaged with the connecting bracket (260). An annular groove (2600) is provided on the outer wall of the connecting bracket (260). Several limiting rods (262) are slidably engaged on the inner side of the limiting chuck (261). The limiting chuck (261) is provided with locking springs (2620) that abut against each of the limiting rods (262).

5. The chemical pesticide water-sediment system metabolic experimental apparatus according to claim 1, characterized in that, The water bath (20) is fitted with several agitating spirals (6) inside, and the ends of each agitating spiral (6) penetrate the water bath (20) and are connected to sprockets (60); two sprockets (60) spaced apart from each other are connected by chain drive; a circulating motor (61) is provided on the outer wall of the water bath (20) to provide power to one of the agitating spirals (6).

6. The chemical pesticide water-sediment system metabolic experimental apparatus according to claim 1, characterized in that, The top of the sediment holder (31) is movably engaged with a hollow tube (310), and a sediment sampling component (32) is provided inside the hollow tube (310). The sediment sampling component (32) includes a pull rod (320) sleeved inside the hollow tube (310), a sampling tube (321) located at the bottom of the pull rod (320), and a closed sleeve (322) slidably engaged inside the sampling tube (321). Several different types of sampling tubes are sleeved on the pull rod (320). A guide disc (323) is slidably engaged with the inner wall of the hollow tube (310); the two ends of the sampling tube (321) are closed, and several sampling slots (3210) are evenly distributed at the lower position of the outer side wall of the sampling tube (321); the bottom end of the closed sleeve (322) is open, and the top end of the closed sleeve (322) is provided with a pull rope (324) that passes through the pull rod (320); the top end of the closed sleeve (322) is provided with a return spring (325) sleeved on the outside of the pull rope (324).

7. The chemical pesticide water-sediment system metabolic experimental apparatus according to claim 1, characterized in that, A liquid phase collection tube (33) is provided inside the reaction bottle (30) and above the sediment holder (31) via a tube seat (330). A telescopic tube (331) is sleeved inside the liquid phase collection tube (33). An adjusting push rod (332) connected to the telescopic tube (331) is slidably engaged on the tube seat (330).

8. The chemical pesticide water-sediment system metabolic experimental apparatus according to claim 1, characterized in that, The water bath (20) is equipped with a temperature sensor and a temperature controller (24).

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