A pollutant enrichment sampling device for lake and reservoir water inlets and outlets
By designing an olive-shaped streamlined detection frame and a limiting and fixing mechanism at the inlet and outlet of the lake/reservoir, the problem of detection error caused by rapid water flow was solved, and the accurate enrichment and detection of pollutants in high-velocity water bodies was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HYDROLOGICAL BUREAU OF PEARL RIVER WATER CONSERVANCY COMMISSION MINISTRY OF WATER RESOURCES
- Filing Date
- 2025-07-10
- Publication Date
- 2026-06-12
AI Technical Summary
Existing detection devices at the inlet and outlet of lakes and reservoirs suffer from large errors in detection results due to the rapid water flow, which causes different vertical detection surfaces to be affected by the water flow differently. This makes it impossible to accurately reflect the dynamic changes of pollutants.
A pollutant enrichment sampling device for lake and reservoir inlets and outlets was designed. It adopts an axially extended socket and an olive-shaped streamlined detection frame. The enrichment devices are set on both sides of the widest part of the detection frame cross-section. Combined with the fixing mechanism of limit blocks and springs, it ensures that each enrichment device works in a similar hydrodynamic environment, thereby reducing detection errors.
It improves the accuracy of detection results, reduces device vibration and deflection caused by water flow impact, ensures that each enrichment device is independently exposed to the water, reduces detection errors, and is suitable for high-velocity water environments.
Smart Images
Figure CN224354145U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water sample enrichment technology, and in particular to a pollutant enrichment and sampling device for the inlet and outlet of a lake or reservoir. Background Technology
[0002] Water pollution is becoming increasingly prominent, with pollutants becoming more complex and their concentrations gradually decreasing, placing higher demands on water environment monitoring. Traditional water sampling and analysis methods have many limitations. For example, instantaneous sampling can only obtain water samples at a specific moment and location, making it difficult to comprehensively reflect the dynamic changes of pollutants in time and space and their long-term exposure levels. Furthermore, potential contamination during sample collection, transportation, and storage, as well as losses during cumbersome pretreatment processes such as filtration, extraction, and concentration, all affect the accuracy of the test results.
[0003] Against this backdrop, passive sampling techniques, developed since the 1970s, have been widely applied in the field of water monitoring. Among them, thin-film diffusion gradient (DGT) technology uses diffusion to adsorb target substances from the environment onto a specific binding phase, thereby achieving in-situ sampling and quantitative analysis of pollutants. Its advantages include providing time-weighted average concentrations, reflecting the bioavailability of pollutants, in-situ filtration and enrichment reducing subsequent sample processing time, and optimizing detection limits. Circular DGTs can be used to determine nutrients (nitrogen / phosphorus), heavy metals, nutrients, rare earth elements, and organic pollutants such as antibiotics, prohibited drugs, pesticides, polycyclic aromatic hydrocarbons, perfluorinated compounds, pharmaceuticals and personal care products, and endocrine disruptors in water bodies. Currently, DGT testing methods for lake water generally involve constructing simple devices, mounting circular DGTs on these devices, placing the devices in the lake water, and performing in-situ testing of surface water or sediment overlying water. The equipment used in the prior art generally includes: multiple DGTs installed on multiple vertical detection surfaces (four mutually perpendicular detection surfaces) outside the PVC pipe, the PVC pipe is placed in surface water, and the DGTs are used to test the surface water.
[0004] Although the above-mentioned testing device can complete the DGT test in the surface water or overlying water of lakes, it has the following disadvantages: when the test needs to be carried out in the environment of the lake or reservoir inlet and outlet, the water flow at the lake or reservoir inlet and outlet is abnormally rapid, which causes different vertical test surfaces of the PVC pipe to be affected by the water flow differently, resulting in deviations in the test results. This makes the test results of each vertical test surface too large, resulting in inaccurate results. Utility Model Content
[0005] To address the aforementioned technical problems, this utility model provides a pollutant enrichment and sampling device for the inlet and outlet of lakes and reservoirs.
[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:
[0007] A pollutant enrichment and sampling device for the inlet and outlet of a lake or reservoir includes an axially extending socket, a detection frame movable along the axial direction of the socket, and several enrichment devices.
[0008] The cross-section of the detection frame has a wider width in the middle than at both ends, and the cross-section has an olive-shaped streamlined structure.
[0009] The testing frame is connected to the socket via a fixing mechanism, and the testing frame has symmetrical mounting slots on both sides in the middle.
[0010] The enrichment device is detachably mounted in the mounting slot.
[0011] Preferably, the detection frame has an olive-shaped streamlined structure on the outside, with its ends facing the direction of water flow.
[0012] Furthermore, the socket includes a plurality of positioning holes arranged in a row on the outside of the socket; the detection frame is sleeved on the outside of the socket and is limitedly connected to the positioning holes by a fixing mechanism.
[0013] Furthermore, the fixing mechanism includes a limiting block and a spring, and the detection frame is provided with a limiting groove, which connects to limiting hole a and limiting hole b; the limiting block is movably fixed in the limiting groove by the spring, and can move through limiting hole a and positioning hole.
[0014] Preferably, the limiting block includes a ball or a cylinder, and the limiting block is fixedly connected to the spring and disposed in the limiting groove, with the spring and the limiting groove forming an abutment.
[0015] Furthermore, the mounting slot is a slot in which several enrichment devices are engaged, and the limiting hole b is located above the slot. The limiting block can also pass through the limiting hole b to limit the enrichment devices.
[0016] Furthermore, the mounting slot also includes a limiting rail, which limits the movement of several enrichment devices within the slot groove.
[0017] Preferably, the limiting block can also pass through the limiting hole b to vertically limit the enrichment device; the limiting rail can laterally limit the several enrichment devices in the positioning groove.
[0018] Furthermore, the socket is provided with a guide rail, and the testing frame is provided with a guide groove. The guide rail of the socket is set on the guide groove of the testing frame to form a sliding fit.
[0019] Furthermore, the socket includes a tapered structure or a pin structure below it.
[0020] Furthermore, the pin structure includes a pin head and a pin seat, wherein the pin head and the pin seat are detachably abutted.
[0021] Furthermore, the outside of the detection frame is also equipped with a guide plate for guiding the flow of water.
[0022] Furthermore, the enrichment device includes a DGT device, which comprises an adsorption membrane, a diffusion membrane, a filter membrane, and a housing.
[0023] Compared with the prior art, the beneficial effects of this utility model's technical solution are:
[0024] ① The detection frame has an olive-shaped streamlined structure with its ends facing the direction of water flow. The enrichment devices are concentrated on both sides of the widest part of the detection frame's cross-section. When water flows through this position, the flow velocity distribution is relatively uniform, and the influence of the flow around the device body is minimal. This ensures that each enrichment device is exposed to a similar hydrodynamic environment, reduces the detection error between each vertical detection surface, and thus improves the accuracy of the detection results.
[0025] ② The olive-shaped streamlined structure of the detection frame has a small cross-section at both ends. The ends are placed facing the direction of water flow, forming a "teardrop"-shaped flow guide structure at the ends. This can evenly disperse the impact force of the water flow along the axial direction, significantly reduce the resistance at the water-facing end, reduce the vibration or deflection of the device caused by the impact of the water flow, and avoid local deformation or breakage caused by stress concentration. It is especially suitable for high-velocity water bodies (such as rivers and tidal areas).
[0026] ③ The enrichment device is embedded in the side slot of the detection frame. The surface of the enrichment device is flush with or slightly concave with the outer contour of the detection frame to avoid the device protruding and causing local turbulence or mutual obstruction, and to ensure that each enrichment device is independently and fully exposed to the water.
[0027] ④ The combination design of springs and limit blocks (such as ball / cylinder) provides elastic locking force to ensure that the detection frame and socket are not easily loosened in dynamic water, while allowing buffer protection when subjected to external impact;
[0028] The vertical limiting hole b and the limiting block, combined with the lateral constraint of the guide rail, effectively prevent the enrichment device from shifting due to water flow impact or equipment movement, thus improving data reliability.
[0029] ⑤ The socket adopts a conical structure or a detachable pin structure (the pin head and pin seat are designed separately), which can adapt to various water bottom environments such as soft mud or hard riverbed, and is convenient for transportation and assembly. Attached Figure Description
[0030] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0031] Figure 1 This is a schematic diagram of the detection device;
[0032] Figure 2 This is a schematic diagram of the testing frame;
[0033] Figure 3 This is a structural diagram of the socket;
[0034] Figure 4 This is a front view of the detection device;
[0035] Figure 5 This is a cross-sectional view of the detection device;
[0036] Figure 6 This is an enlarged diagram of A;
[0037] Figure 7 This is a top view of the detection device;
[0038] Figure 8 This is an enlarged diagram of B;
[0039] Figure 9 This is a schematic diagram of the enrichment device;
[0040] Figure 10 This is a front view of the detection device installed underwater;
[0041] Figure 11 This is a top view of the detection device installed underwater;
[0042] Figure 12 This is a schematic diagram of the structure of Example 3.
[0043] The reference numerals in the attached figures are as follows:
[0044] 1. Socket; 101. Positioning hole; 2. Testing frame; 201. Mounting slot; 202. Limiting groove; 203. Limiting hole a; 204. Limiting hole b; 3. Enrichment device; 4. Limiting block; 5. Spring; 6. Guide rail; 7. Guide groove; 8. Pin head; 9. Pin seat; 10. Guide plate; 11. Adsorption membrane; 12. Diffusion membrane; 13. Filter membrane; 14. Housing. Detailed Implementation
[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this application. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the described embodiments without creative effort are within the scope of protection of this application.
[0046] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0047] Example 1
[0048] like Figure 1-11 As shown, this embodiment discloses a pollutant enrichment and sampling device for the inlet and outlet of a lake or reservoir, including an axially extending socket 1, a detection frame 2 that can move along the axial direction of the socket 1, and several enrichment devices 3.
[0049] The cross-section of the detection frame 2 has a wider width in the middle than at both ends, and the cross-section has an olive-shaped streamlined structure.
[0050] The testing frame 2 is connected to the socket 1 through a fixing mechanism, and the testing frame 2 has symmetrical mounting slots 201 on both sides of the middle.
[0051] The enrichment device 3 is detachably installed in the mounting slot 201.
[0052] The socket 1 includes a plurality of positioning holes 101 arranged in a row on the outside of the socket 1; the detection frame 2 is sleeved on the outside of the socket 1 and is limitedly connected to the positioning holes 101 by a fixing mechanism.
[0053] The fixing mechanism includes a limiting block 4 and a spring 5. The detection frame 2 is provided with a limiting groove 202, which connects to a limiting hole a203 and a limiting hole b204. The limiting block 4 is movably fixed in the limiting groove 202 by the spring 5, and can move through the limiting hole a203 and the positioning hole 101.
[0054] The mounting slot 201 is a slot in which several enrichment devices 3 are engaged. The limiting hole b204 is located above the slot, and the limiting block 4 can also pass through the limiting hole b204 to limit the enrichment device 3.
[0055] The mounting slot 201 also includes a limiting rail, which limits the movement of several enrichment devices 3 within the slot.
[0056] When the enrichment device 3 is installed, multiple enrichment devices 3 (such as DGT devices) are pushed laterally into the slot of the mounting slot 201, and the limiting rail constrains the lateral displacement of the enrichment device 3.
[0057] Then, under the action of spring 5, the limiting block 4 passes through the limiting hole b204 to vertically limit the enrichment device 3 and prevent it from falling off; the enrichment devices 3 are symmetrically installed on both sides of the detection frame 2 to ensure balance.
[0058] Then, for the equipment installation location, insert the bottom of socket 1 into the bottom sediment (such as mud or rock) of the lake or reservoir, ensuring that socket 1 is fixed vertically;
[0059] According to the target sampling water depth, the detection frame 2 is slid up and down along the socket 1, so that the detection frame 2 moves to the target height through the sliding cooperation of the guide groove 7 and the guide rail 6. Then, under the action of the spring 5, the limiting block 4 is inserted into the limiting groove 202, passes through the limiting hole a203 and the positioning hole 101, and the detection frame 2 is fixed, thereby adapting to the sampling needs of different water depths (such as shallow sediment interface or middle water body) and improving the adjustment accuracy.
[0060] Finally, adjust the direction of the testing frame 2 so that the end of the testing frame 2 faces the direction of water flow, and the guide plate 10 assists in guiding the direction of water flow.
[0061] The water flow is diverted by the streamlined structure with an olive-shaped cross-section of the detection frame 2, which can reduce turbulence; the guide plate 10 further stabilizes the water flow, so that the laminar flow containing pollutants passes through the enrichment device 3 evenly; the DGT device continuously adsorbs pollutant molecules in the water through the synergistic effect of the filter membrane 13, the diffusion membrane 12 and the adsorption membrane 11, realizing time integral enrichment.
[0062] After a certain period of enrichment sampling, the detection frame 2 is released by pressing the limiting block 4, and then the detection frame 2 is lifted to the water surface along the guide rail 6; the enrichment device 3 is released by pressing the limiting block 4 again, and then taken out and sent to the laboratory for analysis of pollutant concentration; a specific enrichment device 3 can also be replaced separately, reinstalled and monitored again.
[0063] When testing is required at the inlet and outlet of a lake or reservoir, the water flow at the inlet and outlet is extremely turbulent. The cross-section of the testing frame 2 is an olive-shaped streamlined structure with its ends facing the direction of water flow. The enrichment devices 3 are concentrated on both sides of the widest part of the cross-section in the middle of the testing frame 2. When the water flows through this position, the velocity distribution is relatively uniform and the influence of the flow around the device body is minimal. This ensures that each enrichment device 3 is exposed to a similar hydrodynamic environment, reduces the detection error between each vertical testing surface, and thus improves the accuracy of the test results.
[0064] The cross-section of the test frame 2 in this application is smaller at both ends, forming an overall "olive-shaped" flow guide structure. This structure can evenly distribute the water flow impact force along the axial direction, significantly reduce the resistance at the water-facing end, reduce the vibration or deflection of the device caused by the water flow impact, and avoid local deformation or breakage caused by stress concentration.
[0065] Specifically, the enrichment device 3 is embedded in the side slot of the detection frame 2. Since the surface of the enrichment device 3 is flush with or slightly concave with the outer contour of the detection frame 2, it can avoid the device protruding and causing local turbulence or mutual shading, ensuring that each enrichment device 3 is independently and fully exposed to the water.
[0066] As one embodiment, the socket 1 is provided with a guide rail 6, and the test frame 2 is provided with a guide groove 7. The guide rail 6 of the socket 1 is set on the guide groove 7 of the test frame 2 to form a sliding fit.
[0067] Specifically, the socket 1 is vertically fixed to the bottom sediment of the lake or reservoir using a pin structure or a conical base, ensuring that the guide rail 6 extends axially along the direction of water flow. This effectively reduces sliding resistance and allows the lifting and positioning of the testing frame 2 to be completed in a short time.
[0068] Then the operator holds the testing frame 2, aligns the guide groove 7 with the guide rail 6 of the socket 1, and slides the testing frame 2 along the axial direction of the guide rail 6; the precise fit between the guide groove 7 and the guide rail 6 ensures that there is no deviation during the sliding process until the testing frame 2 moves to the target height; the spring 5 pushes the limiting block 4 through the limiting hole a203 and the positioning hole 101 to achieve the vertical fixation of the testing frame 2.
[0069] Specifically, the guide rail 6 has an anti-biofouling coating, and the guide groove 7 can also prevent siltation from jamming the sliding structure, ensuring that the equipment can work continuously for many days without failure in eutrophic waters.
[0070] As one embodiment, the external part of the detection frame 2 is also provided with a guide plate 10 for guiding the flow of water.
[0071] Specifically, the tilt adjustment function of the guide vane 10 can improve the stability of the test frame 2 in rapid flow.
[0072] Specifically, the flow deflector 10 is made of transparent polycarbonate material, which reduces interference with the behavior of aquatic organisms and is suitable for monitoring in ecologically sensitive areas.
[0073] As one embodiment, the enrichment device 3 includes a DGT device, which includes an adsorption membrane 11, a diffusion membrane 12, a filter membrane 13, and a housing 14.
[0074] When assembling the enrichment device 3, the DGT device is first assembled in the laboratory. The filter membrane 13, diffusion membrane 12, and adsorption membrane 11 are stacked sequentially inside the outer shell 14, ensuring that each membrane layer is tightly bonded and free of air bubbles. Then, the assembled DGT device is pushed horizontally into the mounting slot 201 of the detection frame 2 for underwater enrichment sampling.
[0075] Water flows through the front opening of the housing 14 of the DGT device, and sequentially passes through the filter membrane 13 (filtering suspended solids and organisms) and the diffusion membrane 12 (controlling the diffusion rate of pollutants). Finally, the target pollutants are selectively enriched by the adsorption membrane 11. The diffusion membrane 12 forms a fixed diffusion gradient, so that the pollutants are captured by the adsorption membrane 11 at a steady-state rate according to the molecular weight / charge characteristics, realizing time-integrated sampling.
[0076] Example 2
[0077] like Figure 1-11 As shown, this embodiment discloses a pollutant enrichment sampling device for the inlet and outlet of a lake or reservoir. When the riverbed is a "soft bottom" such as bottom mud and gravel, the socket 1 of this application has a conical structure below it.
[0078] During operation, the conical structure of socket 1 is vertically inserted into the bottom sediment (such as silt, sand or clay) of the lake or reservoir. The conical tip is penetrated into the bottom sediment by manual or mechanical pressure, and the conical surface contacts the bottom sediment to form a friction anchor.
[0079] At this point, the conical structure is completely submerged in the bottom mud, with only the top positioning hole 101 exposed. The conical tip of the socket 1 is embedded in the cracks of the bottom mud and gravel, and its sidewalls adhere to the bottom material to enhance stability.
[0080] When water flows and impacts the testing frame 2, the wedge-shaped effect of the conical structure of the socket 1 converts the lateral impact force into a vertical component force. The overturning moment is offset by the reaction force of the bottom sediment, which can increase the anti-tipping ability of this equipment.
[0081] When the equipment needs to be recycled, the top of the conical structure is clamped and an upward pulling force is slowly applied. The separation effect between the conical surface and the bottom sediment reduces the adsorption resistance of the bottom sediment, thus achieving non-destructive recycling.
[0082] Specifically, the conical base can be hollowed out and filled with counterweight materials (such as lead pellets) or sensors (such as inclinometers) to allow for adjustable center of gravity.
[0083] This embodiment solves the technical problem of poor stability and easy overturning of traditional sampling equipment in riverbeds with sediment and gravel by optimizing the mechanical properties of the conical structure and designing for environmental adaptability. It provides a highly reliable hardware foundation for monitoring pollutant flux at the inlet and outlet of lakes and reservoirs.
[0084] Example 3
[0085] like Figure 1-12 As shown in the figure, this embodiment discloses a pollutant enrichment sampling device for the inlet and outlet of a lake or reservoir. When the riverbed is a "hard bottom" such as a rock bottom or a concrete bottom, the socket 1 of this application has a pin structure below it.
[0086] As one embodiment, the socket 1 has a pin structure below it; the pin structure includes a pin head 8 and a pin seat 9, and the pin head 8 and the pin seat 9 are detachably connected.
[0087] During operation, a hole is drilled on the surface of a hard substrate (such as rock or concrete). The hole diameter matches the outer diameter of the pin seat 9, and the depth is 1.2-1.5 times the length of the pin seat 9. The pin seat 9 is then embedded into the drilled hole, and an anchoring agent (such as epoxy resin) is injected to fix it. After curing, a permanent anchoring point is formed. The top of the pin seat 9 protrudes from the surface of the substrate and has an internal thread or slot interface. The pin seat 9 is permanently anchored to the hard substrate, and the same anchor point can be repeatedly connected to the detection frame 2, reducing the cost of multi-point monitoring.
[0088] During installation, align the pin 8 at the bottom of socket 1 with the pin seat 9, and lock it with a threaded connection or a snap-lock to complete the detachable rigid connection between socket 1 and the hard base.
[0089] Specifically, a rubber sealing ring is installed at the interface between pin 8 and pin seat 9 to prevent water seepage and corrosion, and to ensure connection stability during long-term monitoring.
[0090] Specifically, multiple pin seats 9 can be deployed on the rigid substrate, supporting the array arrangement of sockets 1 to simultaneously monitor the spatial distribution gradient of pollutants.
[0091] Specifically, pin 8 and pin seat 9 are made of duplex stainless steel, which can reduce the corrosion rate in brackish lake water environments.
[0092] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A pollutant enrichment and sampling device for the inlet and outlet of a lake or reservoir, characterized in that: It includes an axially extending socket (1), a detection frame (2) movable along the axial direction of the socket (1), and several enrichment devices (3); The cross-section of the detection frame (2) is wider in the middle than at both ends, and the cross-section is a streamlined olive-shaped structure. The testing frame (2) is connected to the socket (1) through a fixing mechanism, and the testing frame (2) has symmetrical mounting slots (201) on both sides in the middle. The enrichment device (3) is detachably disposed within the mounting slot (201).
2. The pollutant enrichment and sampling equipment at the inlet and outlet of a lake or reservoir according to claim 1, characterized in that, The socket (1) includes a plurality of positioning holes (101), which are arranged in a row on the outside of the socket (1); the detection frame (2) is fitted on the outside of the socket (1) and is limitedly connected to the positioning holes (101) by a fixing mechanism.
3. The pollutant enrichment and sampling equipment at the inlet and outlet of a lake or reservoir according to claim 2, characterized in that, The fixing mechanism includes a limiting block (4) and a spring (5). The detection frame (2) is provided with a limiting groove (202), which connects to a limiting hole a (203) and a limiting hole b (204). The limiting block (4) is movably fixed in the limiting groove (202) by the spring (5) and can move through the limiting hole a (203) and the positioning hole (101).
4. The pollutant enrichment and sampling equipment at the inlet and outlet of a lake or reservoir according to claim 3, characterized in that, The mounting slot (201) is a slot groove in which several enrichment devices (3) are engaged. The limiting hole b (204) is located above the slot groove. The limiting block (4) can also pass through the limiting hole b (204) to limit the enrichment device (3).
5. The pollutant enrichment and sampling device at the inlet and outlet of a lake or reservoir according to claim 4, characterized in that, The mounting slot (201) also includes a limiting rail, which limits the movement of several enrichment devices (3) in the slot groove.
6. The pollutant enrichment and sampling device for the inlet and outlet of a lake or reservoir according to claim 1, characterized in that, The socket (1) is provided with a guide rail (6), and the testing frame (2) is provided with a guide groove (7). The guide rail (6) of the socket (1) is set on the guide groove (7) of the testing frame (2) to form a sliding fit.
7. The pollutant enrichment and sampling device for the inlet and outlet of a lake or reservoir according to claim 1, characterized in that, The socket (1) includes a tapered structure or a pin structure below it.
8. The pollutant enrichment and sampling device for the inlet and outlet of a lake or reservoir according to claim 7, characterized in that, The pin structure includes a pin head (8) and a pin seat (9), and the pin head (8) and the pin seat (9) are detachably connected.
9. The pollutant enrichment and sampling device for the inlet and outlet of a lake or reservoir according to claim 1, characterized in that, The detection frame (2) is also provided with a guide plate (10) for guiding the flow of water.
10. The pollutant enrichment and sampling device for the inlet and outlet of a lake or reservoir according to claim 1, characterized in that, The enrichment device (3) includes a DGT device, which includes an adsorption membrane (11), a diffusion membrane (12), a filter membrane (13), and a housing (14).