Deepwater sediment-water interface simulation experiment device

Abstract

The invention provides a deepwater sediment-water interface simulation experiment device. The deepwater sediment-water interface simulation experiment device comprises a pressure tank, a pressurized gas tank, a circulating water temperature control unit, a sampling tank, a putting device and a planar optrode unit, the pressurizing tank and the sampling tank are connected with the pressure tank, and the sampling tank is used for sampling and sampling; two sides of the pressure tank are connected with a water inlet and a water outlet of the circulating water temperature control unit; the feeding device and the planar optrode unit are arranged inside the pressure tank, the feeding device is used for feeding the sampling device, and the planar optrode unit is used for emitting a fluorescence signal. According to the invention, hydrostatic pressure, dissolved oxygen level, temperature and other related physical and chemical parameters of a water bottom sediment-water interface within 90m can be simulated, and limitation and economic pressure faced by environment in-situ monitoring are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of experimental simulation equipment, and in particular to a deep-water sediment-water interface simulation experimental device. Background Art

[0002] The complex and variable physical and chemical properties of the sediment-water interface lead to large variability in the migration and transformation of substances near the interface. Therefore, in the environmental field, the distribution and dynamics of substances on the sediment-water interface are very important. In-situ sampling techniques are usually used to collect target substances, such as the diffusion gradient technology in thin films (DGT) based on Fick's first law, which is used to obtain the spatial distribution of target substances. HR-Peeper is based on the principle of osmotic balance between inner and outer membranes to measure the distribution of vertical profiles of substances. It is widely used in the environmental field. However, when it is placed in situ, especially for deeper water bodies, the placement / recovery often fails due to the variable interface environment, resulting in waste of resources. Therefore, a device that can simulate the sediment-water interface is needed to fill this deficiency.

[0003] The existing simulation devices are usually normal pressure simulations and can only simulate shallow water environments. For pressurized simulation devices, the pressure is often released and the lid is opened to collect internal samples. Some indicators are pressure sensitive, which creates certain obstacles to the interpretation of the results. The material distribution of the sediment itself requires vertical profile sampling technology, which cannot be achieved with existing devices. In order to simulate the environment more accurately, it is necessary to monitor dissolved oxygen, but high-pressure dissolved oxygen probes are expensive, and the dissolved oxygen level in the sediment requires microelectrode technology. In order to reduce the cost of the device, this application uses planar photoelectrode technology as a substitute. This technology uses the characteristic emission light of a specific luminescent indicator to correspond to the content of the solute, thereby obtaining a high-resolution distribution of the solute in the water and sediment.

[0004] The patent document with the publication number CN118518829A discloses a simulation experimental device for the material exchange flux of the lake sediment-water interface. The temperature of the device is controlled by the temperature of the jacket between the inner liner and the outer layer. The temperature of the bottom material is changed first, which is a bottom-up change, while the actual temperature change in the lake area is a top-down change. However, the device only realizes the direct measurement of the internal temperature and pressure, and does not realize the direct measurement of indicators such as DO and pH; the device has different methods for adding and sampling from the present device. The water sample collected by the device will remain in the pipeline, while the water sample adding and sampling of the device of the present application is the same sampling tank, which can realize the reflux of residual liquid, and the device of the present application can realize the collection of sediments at a specific depth and the collection of target substances in the vertical profile of the sediment.

[0005] The patent document with publication number CN114609048A discloses a device for automatically measuring dissolved oxygen and pH at the sediment-water interface, which uses a DO / pH sensor to measure the corresponding indicators, and uses a circulating water flow to simulate the flow of water at the bottom of a natural water body, and has a temperature control unit. However, the device is a normal pressure simulation device, which can only simulate the shallow sediment-water interface, and only targets water indicators, without a detection method for sediment indicators, and lacks a dissolved oxygen control unit.

[0006] Patent document with publication number CN201110849Y discloses an indoor simulation device for studying lake sediment-water interface processes, which mainly includes a hydrodynamic disturbance device, an illumination device, a constant temperature water bath device, and an automatic sampling device. However, the patent document still has the defect of being unable to accurately simulate the experimental environment.

[0007] The patent document with publication number US20240003800A1 discloses a deep sediment flow culture system simulating in-situ water pressure, and specifically discloses that the system includes a flow culture apparatus, and an inflow pressurizer and an outflow pressure reducer respectively connected to the flow culture apparatus, and the inflow pressurizer includes a pressure tank, an air inlet pipe, a pressure regulating valve, a pressure-resistant container and a first bracket. However, the patent document still has the defect of being unable to accurately simulate the experimental environment. Summary of the invention

[0008] In view of the defects in the prior art, the object of the present invention is to provide a deep-water sediment-water interface simulation experimental device.

[0009] A deep-water sediment-water interface simulation experimental device provided by the present invention comprises: a pressure tank, a pressurized gas tank, a circulating water temperature control unit, a sampling tank, a delivery device and a planar photoelectrode unit;

[0010] The pressurized tank and the sampling tank are connected to the pressure tank, and the sampling tank is used for sampling and injection; the two sides of the pressure tank are connected to the water inlet and the water outlet of the circulating water temperature control unit;

[0011] The delivery device and the planar optode unit are arranged inside the pressure tank, the delivery device is used for delivering the sampling device, and the planar optode unit is used for emitting a fluorescent signal.

[0012] Preferably, the delivery device comprises: a remote control motor, a rotating shaft, a limiting shaft and a packaging film;

[0013] The sampling device is installed in the pressure tank through the limiting shaft, and the limiting shaft is used to limit and fix the sampling device;

[0014] The packaging film wraps the sampling device, the remote control motor is connected to the packaging film via the rotating shaft, and the packaging film and the sampling device are located in the sediment in the pressure tank;

[0015] When the remote control motor is driven, the remote control motor peels the packaging film off the sampling device through the rotating shaft.

[0016] Preferably, the planar photoelectrode unit comprises: an LED array;

[0017] The pressure tank is provided with a window, and a photosensitive film is provided on the window, and the photosensitive film is used to obtain the fluorescent signal emitted by the LED array;

[0018] The pressure tank is provided with a light source external interface, and the light source external interface is connected to the LED array.

[0019] Preferably, the pressure tank comprises a tank body and an acrylic liner, and the acrylic liner is arranged in the tank body;

[0020] The viewing window includes a first viewing window and a second viewing window, wherein the first viewing window is arranged on the acrylic liner, and the second viewing window is arranged on the tank body corresponding to the first viewing window.

[0021] Preferably, the sampling tank comprises: a first sampling tank;

[0022] The first sampling tank is connected to the pressure tank via a first sampling tank connecting valve, and a first sampling tank injection valve and a first sampling tank sampling valve are provided on the first sampling tank.

[0023] Preferably, the sampling tank further comprises: a second sampling tank;

[0024] The second sampling tank is connected to the pressure tank via a second sampling tank connecting valve, and a second sampling tank injection valve and a second sampling tank sampling valve are provided on the second sampling tank.

[0025] Preferably, the pressurized gas tank comprises: a helium tank, an oxygen tank and a pressurized gas valve;

[0026] The helium tank is provided with a helium tank gas valve, and the oxygen tank is provided with an oxygen tank gas valve. The helium tank gas valve and the oxygen tank gas valve are connected to the pressure tank through the pressurizing gas valve.

[0027] Preferably, the circulating water temperature control unit comprises: a temperature-controlled circulating water pump, a circulating water inlet valve and a circulating water outlet valve;

[0028] The water inlet of the pressure tank is connected to the water outlet of the temperature-controlled circulating water pump through the circulating water inlet valve, and the water outlet of the pressure tank is connected to the water inlet of the temperature-controlled circulating water pump through the circulating water outlet valve.

[0029] Preferably, a dissolved oxygen probe and a pH / ORP probe are provided on the top cover of the pressure tank, and the dissolved oxygen probe and the pH / ORP probe are located inside the pressure tank;

[0030] The top cover of the pressure tank is provided with a dissolved oxygen probe external interface and a pH / ORP probe external interface, the dissolved oxygen probe external interface is connected to the dissolved oxygen probe, and the pH / ORP probe external interface is connected to the pH / ORP probe.

[0031] Preferably, the pressure tank is provided with a safety valve and a sediment sampling valve.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The present invention has the following significant advantages:

[0034] 1. The present invention can simulate the hydrostatic pressure, dissolved oxygen level, temperature and other relevant physical and chemical parameters of the bottom sediment-water interface within 90m, alleviating the limitations and economic pressures faced by in-situ environmental monitoring.

[0035] 2. The present invention can realize real-time monitoring of DO, pH and ORP in the tank, obtain data with higher accuracy, and detect the dissolved oxygen level in the sediment.

[0036] 3. The present invention can realize the collection and addition of materials in the pressure tank and the delivery of DGT under constant pressure, eliminating the influence of the change of hydrostatic pressure on the sediment-water interface.

[0037] 4. The planar optode technology coupled by the present invention can significantly reduce the cost of monitoring.

[0038] 5. The present invention solves the technical problem of how to simulate deep-water environment. The physical and chemical properties of the sediment-water interface are relatively complex, and solves the technical problem of how to monitor the internal environment and how to achieve it using a low-cost and easy-to-operate method.

[0039] 6. The purpose of the simulation of the present invention is to achieve a replacement for the actual in-situ research, so the device should realize the operations of sample collection, material addition, etc. in the in-situ research, especially to minimize the interference with the internal environment (pressure, temperature, gas composition).

[0040] 7. For the simulation cycle, the sampling device of the present invention adopts DGT / HR-Peeper. The equilibrium time of DGT / HR-Peeper is generally short, so it is necessary to insert DGT / HR-Peeper during the simulation process. Opening the pressurized gas tank will cause a significant change in pressure. In order to reduce the impact of this variable, it is necessary to place the device during the pressurization process.

[0041] 8. The present invention adopts the setting of independent inner liner and double sampling tank to realize more control experiments. The internal acrylic liner can be replaced with containers of other sizes and shapes to realize multiple groups of control experiments.

[0042] 9. The DGT / Peeper delivery device of the present invention is relatively independent and can be delivered at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0044] Figure 1 It is a schematic diagram of the overall structure of the deep-water sediment-water interface simulation experimental device;

[0045] Figure 2 To highlight the schematic diagram of the pressure tank;

[0046] Figure 3 To highlight the structure of the pressure tank cover and liner Figure 1 ;

[0047] Figure 4 To highlight the structure of the pressure tank cover and liner Figure 2 ;

[0048] Figure 5 A schematic diagram showing the structure of the delivery device.

[0049] The figure shows:

[0050] First sampling tank injection valve 1 Helium tank valve 19

[0051] First sampling tank 2 Oxygen tank valve 20

[0052] Sampling valve of the first sampling tank 3 Circulating water outlet valve 21

[0053] Pressure gauge 4 Helium tank 22

[0054] Safety valve 5 Oxygen tank 23

[0055] Dissolved oxygen probe external interface 6 First sampling tank connection valve 24

[0056] Pressure tank cover 7 Dissolved oxygen probe 25

[0057] Circulating water inlet valve 8 pH / ORP probe 26

[0058] Light source external interface 9 Second window 27

[0059] Pressure tank 10 Acrylic liner 28

[0060] First viewing window 11 Second sampling tank connecting valve 29

[0061] Sediment sampling valve 12 Heat exchange tube 30

[0062] Temperature controlled circulating water pump 13 LED array 31

[0063] Second sampling tank injection valve 14 remote control motor 32

[0064] Second sampling tank 15 Rotating shaft 33

[0065] Second sampling tank sampling valve 16 limit shaft 34

[0066] Pressurized air valve 17 Delivery device 35

[0067] pH / ORP probe external interface 18 Packaging film 36 DETAILED DESCRIPTION

[0068] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0069] Embodiment 1:

[0070] like Figure 1-5 As shown, this embodiment provides a deep-water sediment-water interface simulation experimental device, including: a pressure tank 10, a pressurized gas tank, a circulating water temperature control unit, a sampling tank, a delivery device and a planar photoelectrode unit; the pressurized tank and the sampling tank are connected to the pressure tank 10, and the sampling tank is used for sampling and injection; the two sides of the pressure tank 10 are connected to the water inlet and outlet of the circulating water temperature control unit; the delivery device and the planar photoelectrode unit are arranged inside the pressure tank 10, the delivery device is used to deliver the sampling device 35, and the planar photoelectrode unit is used to emit a fluorescent signal. The pressure tank 10 is provided with a safety valve 5 and a sediment sampling valve 12. The pressure tank 10 is provided with a pressure gauge 4.

[0071] The sampling tank includes: a first sampling tank 2; the first sampling tank 2 is connected to the pressure tank 10 through a first sampling tank connecting valve 24, and the first sampling tank 2 is provided with a first sampling tank injection valve 1 and a first sampling tank sampling valve 3. The sampling tank also includes: a second sampling tank 15; the second sampling tank 15 is connected to the pressure tank 10 through a second sampling tank connecting valve 29, and the second sampling tank 15 is provided with a second sampling tank injection valve 14 and a second sampling tank sampling valve 16. The pressurized gas tank includes: a helium tank 22, an oxygen tank 23 and a pressurized gas valve 17; the helium tank 22 is provided with a helium tank valve 19, the oxygen tank 23 is provided with an oxygen tank valve 20, and the helium tank valve 19 and the oxygen tank valve 20 are connected to the pressure tank 10 through the pressurized gas valve 17.

[0072] The delivery device includes: a remote control motor 32, a rotating shaft 33, a limiting shaft 34 and a packaging film 36; the sampling device 35 is installed in the pressure tank 10 through the limiting shaft 34, and the limiting shaft 34 is used to limit and fix the sampling device 35; the packaging film 36 is wrapped around the sampling device 35, and the remote control motor 32 is connected to the packaging film 36 through the rotating shaft 33, and the packaging film 36 and the sampling device 35 are located in the sediment in the pressure tank 10; when the remote control motor 32 is driven, the remote control motor 32 peels the packaging film 36 off the sampling device 35 through the rotating shaft 33.

[0073] The sampling device 35 is a DGT / HR-Peeper device structure. The DGT / HR-Peeper is in the shape of a long strip and is directly inserted into the sediment. After a period of time, it is taken out to measure the concentration of the target substance adsorbed by the DGT membrane or the concentration of the target substance in the pore water collected by the HR-Peeper. This device pre-wraps the DGT with a polyethylene packaging film 36 and inserts it into the sediment. When sampling is required, the remote control motor 32 rotates the rotating shaft 33 to peel off the packaging film 36, and the DGT / HR-Peeper is still fixed in the sediment to achieve the above-mentioned sampling operation.

[0074] The circulating water temperature control unit includes: a temperature-controlled circulating water pump 13, a circulating water inlet valve 8 and a circulating water inlet valve 8; the water inlet of the pressure tank 10 is connected to the water outlet of the temperature-controlled circulating water pump 13 through the circulating water inlet valve 8, and the water outlet of the pressure tank 10 is connected to the water inlet of the temperature-controlled circulating water pump 13 through the circulating water outlet valve 21.

[0075] A dissolved oxygen probe 25 and a pH / ORP probe 26 are provided on the pressure tank top cover 7 of the pressure tank 10, and the dissolved oxygen probe 25 and the pH / ORP probe 26 are located inside the pressure tank 10; a dissolved oxygen probe external interface 6 and a pH / ORP probe external interface 18 are provided on the pressure tank top cover 7, and the dissolved oxygen probe external interface 6 is connected to the dissolved oxygen probe 25, and the pH / ORP probe external interface 18 is connected to the pH / ORP probe 26.

[0076] The planar photoelectrode unit includes: an LED array 31; a window is provided on the pressure tank 10, and a photosensitive film is provided on the window, and the photosensitive film is used to obtain the fluorescent signal emitted by the LED array 31; a light source external interface 9 is provided on the pressure tank 10, and the light source external interface 9 is connected to the LED array 31.

[0077] The pressure tank 10 includes a tank body and an acrylic liner 28 ; the acrylic liner 28 is disposed in the tank body, and the viewing windows include a first viewing window 11 and a second viewing window 27 , the first viewing window 11 is disposed on the acrylic liner 28 , and the second viewing window 27 is disposed on the tank body corresponding to the first viewing window 11 .

[0078] The acrylic inner liner 28 is directly placed in the tank body, and the circulating water heat exchange pipe 30 is directly connected to the inner side of the tank body through a quick-tightening straight-through joint, and has no direct connection with the acrylic inner liner 28 .

[0079] This embodiment provides an experimental device, which includes a pressure tank body, a pressurized gas tank, a circulating water temperature control, a sampling / injection tank, a DGT / HR-Peeper delivery device, and a planar optode unit. The sampling / injection tank is connected to the tank body, and its spatial position is adjustable. The pressurized gas tank is connected to the upper part of the tank body. The two sides of the pressure tank are connected to the water inlet and outlet of the circulating water temperature control unit. The DGT delivery device and the planar optode are integrated inside the pressure tank. The specific structure of this embodiment, such as Figure 1-5 shown.

[0080] The device of this embodiment can simulate deep water environment, measure physical and chemical parameters in real time, collect and add samples, place DGT / HR-Peeper and measure dissolved oxygen by planar photode. The specific working process is as follows:

[0081] Deepwater environment simulation: mainly the simulation of temperature, pressure and dissolved oxygen level. The ratio of internal gas components and the overall pressure are controlled by switching the helium valve 19 and the oxygen valve 20. The concentration of dissolved oxygen in the internal water sample is further controlled by monitoring the corresponding indicators through the pressure gauge 4, the dissolved oxygen probe 25 and the pH / ORP probe 26. The circulating water inlet valve 8 and the circulating water outlet valve 21 are opened, and the temperature-controlled circulating water pump 13 is operated to exchange heat with the internal environment through the heat exchange tube 30, thereby achieving temperature control.

[0082] Sample collection: close the first sampling tank injection valve 1 and the first sampling tank sampling valve 3, open the first sampling tank connection valve 24, and press the internal water sample into the first sampling tank 2 under the pressure difference between the inside and outside, then close the first sampling tank connection valve 24, open the first sampling tank sampling valve 3 to let the sample flow out of the first sampling tank 2, and then open the first sampling tank injection valve 1 to balance the pressure difference between the inside and outside of the sampling tank, and the second sampling tank is the same. The sediment sample is pressed out of the pressure tank 10 by opening the sediment sampling valve 12 under the pressure difference between the inside and outside.

[0083] Sample addition: close the first sampling tank sampling valve 3 and the first sampling tank connecting valve 24, open the first sampling tank injection valve 1, inject liquid into the first sampling tank 2, close the first sampling tank injection valve 1, open the first sampling tank connecting valve 24, increase the potential of the first sampling tank 2, and let the internal liquid flow from the first sampling tank 2 into the acrylic liner 28 in the pressure tank 10 under the action of gravity. The same applies to the second sampling tank.

[0084] DGT / HR-Peeper placement: The remote control motor 32 is connected to the rotating shaft 33, and the DGT / HR-Peeper is pre-buried in the sediment under the packaging film 36. The top of the packaging film is connected to the rotating shaft 33. After the pressure tank is pressurized, at a predetermined time, the remote control motor 32 is turned on to drive the rotating shaft 33 to peel off the packaging film 36 from the outside of the DGT / HR-Peeper, and the DGT / HR-Peeper is fixed in the sediment by the limiting shaft 34, completing the constant pressure placement of the sampling device. The high-pressure window 11 can be used to check whether the placement is successful. After the balance is completed, the pressure is released through the pressurized air valve 17. After the internal and external pressure differences are balanced, the pressure tank top cover 7 is opened to take out the device for subsequent analysis.

[0085] Planar photoelectrode method for determination of dissolved oxygen: the photosensitive film is adsorbed on the inner side of the second window 27, the switch of the LED array 31 is controlled, and the fluorescence signal is obtained through the first window 11. The signal data is processed and matched with the value measured by the dissolved oxygen probe 25, so as to obtain the signal-concentration curve under this working condition. In the case of removing the dissolved oxygen probe, this method can be used to determine the dissolved oxygen in the water body and sediment. The first window 11 is a high-pressure window. The second window 27 is a glass window. The LED array 31 is a UV LED array.

[0086] Description of the main features:

[0087] a. The set pressure of the safety valve is less than the withstand pressure of the pressure tank and the maximum withstand pressure of the internal working components, about 10atm;

[0088] b. The outer diameter of the pressurized gas tank is 325mm, the inner diameter is 319mm, and the height is 300mm. The outer diameter of the acrylic liner is 320mm, the inner diameter is 300mm, and the height is 260mm. The volume of the sampling tank is 2L, and the tube diameter can be replaced with DN6-15;

[0089] c. The internal exhaust port connected to the pressurized air valve, the position of the sampling tank, the internal injection port and the position of the internal injection port of the sediment sampling valve can be adjusted;

[0090] d. The heat exchange tube is made of copper;

[0091] e. The glass window and high-pressure window on the acrylic liner have high light transmittance, and the geometric center of the window is 150mm above the bottom of the liner;

[0092] f. The gap between the limit axes of the DGT / HR-Peeper delivery device is slightly smaller than the thickness of the DGT / HR-Peeper.

[0093] This embodiment can simulate the hydrostatic pressure, dissolved oxygen level, temperature and other relevant physical and chemical parameters of the bottom sediment-water interface within 90 m, alleviating the limitations and economic pressures faced by in-situ environmental monitoring.

[0094] This embodiment can realize real-time monitoring of DO, pH, and ORP in the tank, obtain higher-precision data, and detect the dissolved oxygen level in the sediment. This embodiment can realize the collection and addition of substances in the pressure tank and DGT delivery under constant pressure, eliminating the impact of changes in hydrostatic pressure on the sediment-water interface. The planar optode technology coupled in this embodiment can significantly reduce the cost of monitoring. The setting of the independent liner and double sampling tanks in this embodiment can realize more control experiments.

[0095] The internal acrylic liner of this embodiment can be replaced with containers of other sizes and shapes to achieve multiple groups of control experiments. The DGT / Peeper delivery device of this embodiment is relatively independent and can be delivered at the same time. This embodiment adds a mixing device to quickly balance the dissolved oxygen and temperature.

[0096] The mixing device can be realized through the existing modules: the air inlet can be placed below the water surface by adjusting the spatial position of the air outlet inside, and the gas-liquid mixing is achieved through the turbulent flow generated by the air intake, promoting the dissolution balance. Since the circulating water temperature is lower than the ambient temperature of the device, the fluid around the heat exchange tube has a lower temperature than the entire internal system, and mixing can be completed through convection.

[0097] The present invention can simulate the hydrostatic pressure, dissolved oxygen level, temperature and other relevant physical and chemical parameters of the bottom sediment-water interface within 90 m, alleviating the limitations and economic pressures faced by in-situ environmental monitoring.

[0098] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0099] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A deep-water sediment-water interface simulation experimental device, characterized in that: include: A pressure tank (10), a pressurized gas tank, a circulating water temperature control unit, a sample taking and feeding tank, a delivery device and a planar photoelectrode unit; The pressurizing tank and the sampling tank are connected to the pressure tank (10), and the sampling tank is used for sampling and injection; the two sides of the pressure tank (10) are connected to the water inlet and the water outlet of the circulating water temperature control unit; The delivery device and the planar optode unit are arranged inside the pressure tank (10); the delivery device is used to deliver the sampling device (35); and the planar optode unit is used to emit a fluorescent signal.

2. The deep-water sediment-water interface simulation experimental device according to claim 1, characterized in that: The delivery device comprises: a remote control motor (32), a rotating shaft (33), a limiting shaft (34) and a packaging film (36); The sampling device (35) is installed in the pressure tank (10) via the limiting shaft (34), and the limiting shaft (34) is used to limit and fix the sampling device (35); The packaging film (36) is wrapped around the sampling device (35), the remote control motor (32) is connected to the packaging film (36) via the rotating shaft (33), and the packaging film (36) and the sampling device (35) are located in the sediment in the pressure tank (10); When the remote control motor (32) is driven, the remote control motor (32) peels the packaging film (36) off the sampling device (35) via the rotating shaft (33).

3. The deep-water sediment-water interface simulation experimental device according to claim 1, characterized in that: The planar photoelectrode unit comprises: an LED array (31); The pressure tank (10) is provided with a viewing window, and a photosensitive film is provided on the viewing window, and the photosensitive film is used to obtain the fluorescent signal emitted by the LED array (31); The pressure tank (10) is provided with a light source external interface (9), and the light source external interface (9) is connected to the LED array (31).

4. The deep-water sediment-water interface simulation experimental device according to claim 3, characterized in that: The pressure tank (10) comprises a tank body and an acrylic liner (28), wherein the acrylic liner (28) is arranged in the tank body; The viewing window comprises a first viewing window (11) and a second viewing window (27); the first viewing window (11) is arranged on the acrylic inner liner (28); and the second viewing window (27) is arranged on the tank body corresponding to the first viewing window (11).

5. The deep-water sediment-water interface simulation experimental device according to claim 1, characterized in that: The sampling tank comprises: a first sampling tank (2); The first sampling tank (2) is connected to the pressure tank (10) via a first sampling tank connecting valve (24), and the first sampling tank (2) is provided with a first sampling tank injection valve (1) and a first sampling tank sampling valve (3).

6. The deep-water sediment-water interface simulation experimental device according to claim 5, characterized in that: The sampling tank further comprises: a second sampling tank (15); The second sampling tank (15) is connected to the pressure tank (10) via a second sampling tank connecting valve (29), and the second sampling tank (15) is provided with a second sampling tank injection valve (14) and a second sampling tank sampling valve (16).

7. The deep-water sediment-water interface simulation experimental device according to claim 1, characterized in that: The pressurized gas tank comprises: a helium tank (22), an oxygen tank (23) and a pressurized gas valve (17); The helium tank (22) is provided with a helium tank valve (19), and the oxygen tank (23) is provided with an oxygen tank valve (20). The helium tank valve (19) and the oxygen tank valve (20) are connected to the pressure tank (10) via the pressurizing valve (17).

8. The deep-water sediment-water interface simulation experimental device according to claim 1, characterized in that: The circulating water temperature control unit comprises: a temperature-controlled circulating water pump (13), a circulating water inlet valve (8) and a circulating water outlet valve (21); The water inlet of the pressure tank (10) is connected to the water outlet of the temperature-controlled circulating water pump (13) via the circulating water inlet valve (8), and the water outlet of the pressure tank (10) is connected to the water inlet of the temperature-controlled circulating water pump (13) via the circulating water outlet valve (21).

9. The deep-water sediment-water interface simulation experimental device according to claim 1, characterized in that: A dissolved oxygen probe (25) and a pH / ORP probe (26) are provided on a pressure tank top cover (7) of the pressure tank (10), and the dissolved oxygen probe (25) and the pH / ORP probe (26) are located inside the pressure tank (10); The pressure tank top cover (7) is provided with a dissolved oxygen probe external interface (6) and a pH / ORP probe external interface (18); the dissolved oxygen probe external interface (6) is connected to the dissolved oxygen probe (25), and the pH / ORP probe external interface (18) is connected to the pH / ORP probe (26).

10. The deep-water sediment-water interface simulation experimental device according to claim 1, characterized in that: The pressure tank (10) is provided with a safety valve (5) and a sediment sampling valve (12).

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