A dgt device for gradient thin film diffusion method and method of use

Abstract

The present application relates to the technical field of gradient thin film diffusion, and discloses a DGT device for gradient thin film diffusion method and a use method, the device comprising a gradient thin film detection device, a soil positioning device arranged below the gradient thin film detection device and capable of being inserted into soil; the gradient thin film detection device comprises a detector mounting structure, a gradient thin film detector arranged on the detector mounting structure, and an elastic expansion device arranged inside the detector mounting structure and capable of contacting the gradient thin film detector; the use method comprises the following steps: S1, placing the DGT detection device into soil; S2, closely contacting the gradient detection module with soil; S3, gradient diffusion detection; the device can closely contact the gradient detection module with soil, and the detection range of soil is more extensive, which is conducive to promoting accurate detection of heavy metal content in soil.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gradient thin film diffusion technology, in particular to a DGT device for gradient thin film diffusion method and a use method thereof. BACKGROUND

[0002] It is of great significance to study the stabilization efficiency and ecological risk assessment of the repaired soil. The main methods for assessing the ecological risk of soil at home and abroad include chemical leaching method, biological method and material structure characterization. Gradient thin film diffusion technology (DGT) can obtain the effective content and spatial distribution of target substances in the environment medium, ion-state-complexation state binding kinetics and solid-liquid exchange kinetics by studying the gradient diffusion of target substances in the diffusion layer and the buffer kinetics process. Therefore, gradient diffusion technology is usually used to study soil at home and abroad, which has the advantages of accurate analysis results, simple operation, low cost, short experimental period and strong controllability, and is gradually used in risk assessment of heavy metal contaminated soil in many countries.

[0003] In the prior art, gradient thin film diffusion technology is usually used in the laboratory to detect a small amount of soil samples for determining heavy metals in soil. Therefore, a device capable of directly detecting soil by gradient thin film diffusion outdoors is needed to improve the convenience of risk assessment of heavy metal contaminated soil.

[0004] The gradient thin film diffusion detection device in the prior art can usually only detect soil in the horizontal direction, and the operation process is complex. The operator needs to smear the detection soil on the surface of the gradient detection module, and then place the gradient detection module on the soil for gradient thin film diffusion detection. The technical problems existing in the prior art are that the gradient detection device is not closely combined with the soil, and the detection range is small, which leads to inaccurate detection of heavy metals in the soil. SUMMARY

[0005] The technical problem solved by the present application is that the gradient detection device provided by the prior art is not closely combined with the soil, and can only detect soil in the horizontal direction and has a small detection range, which leads to inaccurate detection of heavy metals in the soil.

[0006] The technical solution of the present application is a DGT device for gradient thin film diffusion method, which comprises a gradient thin film detection device for detecting heavy metal pollution in soil, and a soil positioning device arranged below the gradient thin film detection device and capable of being inserted into the soil.

[0007] The gradient thin film detection device comprises a detector mounting structure fixedly mounted on a soil positioning device, a plurality of gradient thin film detectors arranged on the detector mounting structure, and an elastic expansion device arranged inside the detector mounting structure and capable of contacting the gradient thin film detectors;

[0008] The detector mounting structure is a rectangular block; the rectangular block is hollow inside and is provided with an expansion cavity;

[0009] A bottom detection port communicating with the expansion cavity is arranged on the lower end surface of the rectangular block; side surface detection ports communicating with the expansion cavity are arranged on the four side surfaces of the rectangular block; and a top connecting port is arranged on the upper end surface of the rectangular block;

[0010] The gradient thin film detector comprises a detection ring movably embedded in the bottom detection port and the side surface detection ports, a sealing cover inlaid and sealed outside the detection ring, and a gradient detection module arranged inside the detection ring and capable of contacting the elastic expansion device;

[0011] The elastic expansion device comprises a mounting table horizontally mounted in the top connecting port and an air bag arranged below the mounting table; a gas inlet port connected with the air bag is arranged in the middle of the mounting table;

[0012] The air bag can extrude the gradient detection module through the bottom detection port and the side surface detection ports after being inflated;

[0013] The gradient detection module comprises a filter membrane arranged on the detection ring and close to the sealing cover, a fixed membrane arranged on the detection ring and close to the air bag, and a diffusion membrane arranged between the filter membrane and the fixed membrane.

[0014] Description: The filter membrane can block large-particle impurities in the soil; the filter membrane and the diffusion membrane serve as diffusion materials for heavy metal ions; and the fixed membrane serves as a fixed material for absorbing metal ions, which can effectively collect heavy metal ions.

[0015] Further, the soil positioning device comprises two U-shaped forks arranged below the detector mounting structure and a connecting baffle arranged between the two U-shaped forks;

[0016] The U-shaped forks are respectively arranged below the two sides of the detector mounting structure and have openings facing downward; and a rib groove is vertically arranged on the U-shaped fork.

[0017] Description: The U-shaped fork can fix the detector mounting structure on the soil, improve the stability of the detector mounting structure and the soil, and ensure effective detection of the gradient detection module.

[0018] Further, a grab handle is fixedly arranged on the sealing cover;

[0019] The bottom detection port, the side detection port, and the four corners of the side detection port are provided with clamping grooves; clamping columns are fixed in the clamping grooves;

[0020] The detection ring is provided with connecting ears corresponding to the clamping grooves; the connecting ears are provided with clamping holes corresponding to the clamping columns.

[0021] Description: The clamping grooves and the clamping columns can quickly clamp the connecting ears, facilitating the quick installation and disassembly of the sealing cover.

[0022] Further, the shape of the air bag after inflation is one of a sphere and a rectangular block.

[0023] The air bag and the fixed film are clamped with a silica gel baffle.

[0024] The silica gel baffle and the air bag are provided with a pressure sensor.

[0025] Description: The pressure data detected by the pressure sensor determines that the air pressure of the air bag reaches a predetermined pressure, facilitating the control of the air pressure of the air bag; the silica gel baffle deforms under the expansion and extrusion of the air bag, and can seal the side detection port and the bottom detection port, preventing soil and other impurities from entering the inside of the gradient film detection device.

[0026] Further, the installation table is provided with an automatic inflation rod.

[0027] The automatic inflation rod comprises a handheld operation pipe vertically arranged on the installation table, a mounting bracket arranged inside the handheld operation pipe, a portable power supply arranged in the middle of the mounting bracket, an air inlet pump arranged inside the handheld operation pipe above the mounting bracket, and an operation controller arranged on the mounting bracket and electrically connected to the air inlet pump and the portable power supply.

[0028] An air inlet window is arranged on the upper end of the handheld operation pipe and communicates with the air inlet of the air inlet pump; the air outlet of the air inlet pump and the inflation port are communicated through an air pipe.

[0029] Description: The handheld operation pipe facilitates the operation of the staff; the portable power supply, the air inlet pump, and the operation controller can complete the inflation of the air bag; and the gradient film detection device has the inflation function.

[0030] Further, a first circular baffle is horizontally arranged on the upper end surface of the detector mounting structure.

[0031] The upper end of the sealing cover is hingedly connected to the lower surface of the first circular baffle; and the lower end of the sealing cover is clamped with the side detection port.

[0032] Illustration: The first circular baffle can protect the handheld operation tube from contacting the soil.

[0033] Further, the sealing cover is internally provided with an opening downward extension detection module.

[0034] Illustration: The extension detection module arranged in the sealing cover can collect and detect the heavy metals on the soil surface, which is beneficial to expand the detection range and improve the detection accuracy.

[0035] Further, the upper end surface of the detector mounting structure is horizontally provided with a second circular baffle.

[0036] The surface of the second circular baffle is provided with a notch corresponding to the side detection port; the sealing cover is provided with a pull rope; and the pull rope pulls the sealing cover to move upward and penetrate the notch.

[0037] Illustration: The notch arranged on the second circular baffle enables the sealing cover to penetrate the notch under the pulling of the pull rope, so that the sealing cover is taken out; in use, the handheld operation tube is directly used to insert the gradient film detection device into the soil, so that the second circular baffle is flush with the soil, the pull rope is pulled to take out the sealing cover, and the gradient detection module is in contact with the soil for detection.

[0038] A use method of a DGT device for gradient film diffusion method, comprising the following steps:

[0039] S1, placing the DGT detection device into the soil

[0040] The sealing cover of the gradient film detector installed on the bottom detection port and the side detection port is opened; the upper end of the detection mounting structure is held to make the soil positioning device enter the soil; and the upper end surface of the detection mounting structure is pressed to be flush with the upper surface of the soil.

[0041] S2, the gradient detection module is in close contact with the soil

[0042] Then, the air bag is inflated through the inflation port; the air bag extrudes the gradient detection module through the bottom detection port and the side detection port, so that the gradient detection module is in close contact with the soil for effective detection; the pressure data detected by the pressure sensor is used to determine whether the air pressure of the air bag reaches the predetermined pressure, and the inflation is stopped.

[0043] S3, gradient diffusion detection

[0044] The gradient detection module utilizes the principle of free diffusion, so that the heavy metal ions pass through the filter membrane and the diffusion membrane in a diffusion manner, and then are captured by the fixed membrane and linearly distributed on the diffusion membrane.

[0045] The beneficial effects of the present application are that the DGT device for gradient thin film diffusion method provided by the present application can comprehensively sample and detect heavy metals in soil through the detection module arranged on the side surface and the bottom surface of the detector mounting structure; the heavy metals in the soil on the horizontal plane can be detected through the bottom surface detection module; the heavy metals in the vertical soil section around the device can be collected and detected through the side detection module, so that the detection range of the soil is wider, and the accurate detection of the heavy metal content in the soil is facilitated.

[0046] The present application sets an expansion cavity on the detector mounting structure, sets an air bag inside the expansion cavity, and makes the gradient detection module and the soil in close contact through the expansion and extrusion of the air bag, so that the accuracy of soil detection of a single gradient detection module is effectively improved, and the data reliability of gradient diffusion detection is improved.

[0047] The present application sets a first circular baffle on the upper end surface of the detector mounting structure, sets a detection module in the sealing cover, can collect and detect the heavy metals on the surface of the soil, and further expands the detection range. The second circular baffle and the notch are set to enable the staff to pull the drawstring to take out the sealing cover, and the operation convenience is improved.

[0048] The present application utilizes the principle of free diffusion, makes the heavy metal ions pass through the filter membrane and the diffusion membrane in a diffusion manner, and then are captured by the fixed membrane and linearly distributed on the diffusion membrane, has the advantages of accurate analysis result, simple operation, low cost, short experimental period, strong controllability and the like. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 is a structural schematic diagram of the whole of embodiment 1 of the present application;

[0050] Figure 2 is a structural schematic diagram of the detector mounting structure of embodiment 1 of the present application;

[0051] Figure 3 is a structural schematic diagram of the elastic expansion device of embodiment 1 of the present application;

[0052] Figure 4 is a structural schematic diagram of the gradient thin film detector of embodiment 1 of the present application;

[0053] Figure 5 is a structural schematic diagram of the gradient detection module of embodiment 1 of the present application;

[0054] Figure 6 is a structural schematic diagram of the automatic inflation rod of embodiment 3 of the present application;

[0055] Figure 7 is a structural schematic diagram of the first circular baffle of embodiment 4 of the present application;

[0056] Figure 8 This is a schematic diagram of the structure of the second circular baffle in Embodiment 5 of the present invention;

[0057] Among them, 1-gradient thin film detection device, 10-detector mounting structure, 100-expansion cavity, 101-bottom detection port, 102-side detection port, 103-top connection port, 11-gradient thin film detector, 110-detection ring, 111-sealing cover, 112-gradient detection module, 1120-filter membrane, 1122-fixed membrane, 1121-diffusion membrane, 113-handle pull ring, 114-clamping groove, 115-clamping post, 116-connecting ear, 117-clamping hole 118-Silicone baffle; 12-Elastic expansion device; 120-Mounting platform; 121-Airbag; 122-Inflation port; 13-First circular baffle; 14-Second circular baffle; 15-Groove; 16-Pull rope; 2-Soil positioning device; 20-U-shaped fork; 21-Connecting baffle; 22-Rib groove; 3-Automatic inflation rod; 30-Handheld operating tube; 31-Mounting frame; 32-Portable power supply; 33-Air pump; 34-Operating controller; 35-Air inlet window; 36-Air pipe. Detailed Implementation

[0058] Example 1

[0059] like Figure 1 The present invention discloses a DGT device for gradient thin film diffusion method, comprising a gradient thin film detection device 1 for detecting heavy metal pollution in soil, and a soil positioning device 2 disposed below the gradient thin film detection device 1 and capable of being inserted into the soil.

[0060] The gradient film detection device 1 includes a detector mounting structure 10 fixedly installed on the soil positioning device 2, four gradient film detectors 11 disposed on the detection mounting structure 10, and an elastic expansion device 12 disposed inside the detector mounting structure 10 and capable of contacting the gradient film detectors 11.

[0061] The detector mounting structure 10 is a rectangular block; the rectangular block is hollow inside and has an expansion cavity 100.

[0062] like Figure 2 , Figure 3 As shown, a bottom detection port 101 communicating with the expansion cavity 100 is provided on the lower end face of the rectangular block; side detection ports 102 communicating with the expansion cavity 100 are provided on the four sides of the rectangular block; and a top connection port 103 is provided on the upper end face of the rectangular block.

[0063] The gradient film detector 11 comprises a detection ring 110 movably embedded in the bottom detection port 101 and the side detection port 102, a sealing cover 111 inlaid and sealed outside the detection ring 110, and a gradient detection module 112 arranged inside the detection ring 110 and capable of contacting the elastic expansion device 12;

[0064] The elastic expansion device 12 comprises a mounting table 120 horizontally mounted in the top connecting port 103 and an air bag 121 arranged below the mounting table 120; the mounting table 120 is provided with an inflation port 122 connected with the air bag 121 in the middle;

[0065] The air bag 121 can extrude the gradient detection module 112 through the bottom detection port 101 and the side detection port 102 after being inflated.

[0066] As shown in Figure 1 The soil positioning device 2 comprises two U-shaped forks 20 arranged below the detector mounting structure 10 and a connecting baffle 21 arranged between the two U-shaped forks 20.

[0067] The U-shaped forks 20 are arranged below the two sides of the detector mounting structure 10 and open downward; the U-shaped forks 20 are vertically provided with rib grooves 22.

[0068] As shown in Figure 4 The sealing cover 111 is fixedly provided with a handle pull ring 113.

[0069] The bottom detection port 101 and the side detection port 102 are provided with clamping grooves 114 around; the clamping grooves 114 are fixedly provided with clamping columns 115.

[0070] The detection ring 110 is correspondingly provided with connecting ears 116 capable of clamping the clamping grooves 114 around; the connecting ears 116 are provided with clamping holes 117 capable of connecting with the clamping columns 115.

[0071] As shown in Figure 5 The gradient detection module 112 comprises a filter membrane 1120 arranged on the detection ring 110 and close to the sealing cover 111, a fixed membrane 1122 arranged on the detection ring 110 and close to the air bag 121, and a diffusion membrane 1121 arranged between the filter membrane 1120 and the fixed membrane 1122.

[0072] The shape of the air bag 121 after being inflated is spherical;

[0073] The air bag 121 and the fixed membrane 1122 are clamped with a silica gel baffle 118 therebetween;

[0074] A pressure sensor is arranged between the silica gel baffle 118 and the air bag 121.

[0075] The pressure sensor, the filter membrane 1120, the fixed membrane 1122 and the diffusion membrane 1121 are all products of the prior art, and the specific product model can be selected by a person skilled in the art according to the needs.

[0076] Embodiment 2

[0077] A method for using a DGT device for gradient thin film diffusion method, comprising the following steps:

[0078] S1, placing the DGT detection device into the soil

[0079] Open the sealing cover 111 of the gradient thin film detector 11 installed on the bottom detection port 101 and the side detection port 102; hold the upper end of the detection installation structure 10, so that the soil positioning device 2 enters the soil; press the detection installation structure 10 so that the upper end surface thereof is flush with the upper surface of the soil;

[0080] S2, the gradient detection module is in close contact with the soil

[0081] Then inflate the air bag 121 through the inflation port 122; make the air bag 121 extrude the gradient detection module 112 through the bottom detection port 101 and the side detection port 102, so that the gradient detection module 112 is in close contact with the soil for effective detection; stop inflating when the pressure data detected by the pressure sensor determines that the air pressure of the air bag 121 reaches a predetermined pressure;

[0082] S3, gradient diffusion detection

[0083] The gradient detection module 112 utilizes the principle of free diffusion to make the heavy metal ions pass through the filter membrane 1120 and the diffusion membrane 1121 in a diffusion manner, and then be captured by the fixed membrane 1122 and linearly gradiently distributed on the diffusion membrane 1121.

[0084] Embodiment 3

[0085] Compared with embodiment 1, the difference is that:

[0086] As shown in Figure 6 , the installation table 120 is provided with an automatic inflation rod 3;

[0087] The automatic inflation rod 3 comprises a handheld operation pipe 30 vertically arranged on the installation table 120, a mounting bracket 31 arranged inside the handheld operation pipe 30, a portable power supply 32 arranged in the middle of the mounting bracket 31, an air inlet pump 33 arranged inside the handheld operation pipe 30 and located above the mounting bracket 31, and an operation controller 34 arranged on the mounting bracket 31 and electrically connected with the air inlet pump 33 and the portable power supply 32;

[0088] The upper end of the handheld operating tube 30 is provided with an air intake window 35 that communicates with the air intake port of the air intake pump 33; the exhaust port of the air intake pump 33 and the air inlet 122 are connected by an air pipe 36.

[0089] Example 4

[0090] The difference compared to Example 2 is:

[0091] like Figure 7 As shown, a first circular baffle 13 is horizontally arranged on the upper surface of the detector mounting structure 10;

[0092] The upper end of the sealing cover 111 is hinged to the lower surface of the first circular baffle 13; the lower end of the sealing cover 111 is snapped into the side detection port 102.

[0093] The sealing cover 111 has an extended detection module with an opening facing downwards inside.

[0094] Example 5

[0095] The difference compared to Example 3 is:

[0096] like Figure 8 As shown, a second circular baffle 14 is horizontally arranged on the upper end surface of the detector mounting structure 10;

[0097] The second circular baffle 14 has a slot 15 on its surface that corresponds to the side detection port 102; the sealing cover 111 is provided with a pull rope 16; the pull rope 16 pulls the sealing cover 111 upward and moves it through the slot 15.

Claims

1. A DGT device for gradient thin-film diffusion, characterized in that, It includes a gradient film detection device (1) for detecting heavy metal pollution in soil, and a soil positioning device (2) disposed below the gradient film detection device (1) and capable of being inserted into the soil. The gradient film detection device (1) includes a detector mounting structure (10) fixedly installed on the soil positioning device (2), a plurality of gradient film detectors (11) disposed on the detector mounting structure (10), and an elastic expansion device (12) disposed inside the detector mounting structure (10) and capable of contacting the gradient film detectors (11). The detector mounting structure (10) is a rectangular block; the rectangular block is hollow inside and has an expansion cavity (100). The rectangular block has a bottom detection port (101) communicating with the expansion cavity (100) on its lower end face; the rectangular block has side detection ports (102) communicating with the expansion cavity (100) on its four sides; and the rectangular block has a top connection port (103) on its upper end face. The gradient thin film detector (11) includes a detection ring (110) movably embedded in the bottom detection port (101) and the side detection port (102), a sealing cover (111) embedded and sealed on the outside of the detection ring (110), and a gradient detection module (112) disposed on the inside of the detection ring (110) and capable of contacting the elastic expansion device (12). The elastic expansion device (12) includes a mounting platform (120) horizontally installed in the top connection port (103) and an airbag (121) disposed below the mounting platform (120); the mounting platform (120) is provided with an inflation port (122) connected to the airbag (121) in the middle. After the airbag (121) is inflated, it can squeeze the gradient detection module (112) through the bottom detection port (101) and the side detection port (102). The gradient detection module (112) includes a filter membrane (1120) disposed on the detection ring (110) and close to the sealing cap (111), a fixed membrane (1122) disposed on the detection ring (110) and close to the airbag (121), and a diffusion membrane (1121) disposed between the filter membrane (1120) and the fixed membrane (1122). The inflated shape of the airbag (121) is either spherical or rectangular. A silicone baffle (118) is sandwiched between the airbag (121) and the fixing membrane (1122). A pressure sensor is provided between the silicone baffle (118) and the airbag (121); An automatic inflation rod (3) is provided on the mounting platform (120); The automatic inflation rod (3) includes a handheld operating tube (30) vertically mounted on the mounting platform (120), a mounting frame (31) inside the handheld operating tube (30), a portable power supply (32) in the middle of the mounting frame (31), an air pump (33) inside the handheld operating tube (30) and above the mounting frame (31), and an operating controller (34) mounted on the mounting frame (31) and electrically connected to the air pump (33) and the portable power supply (32). The upper port of the handheld operating tube (30) is provided with an air intake window (35) that is connected to the air intake port of the air intake pump (33); the exhaust port of the air intake pump (33) and the air filling port (122) are connected by an air pipe (36).

2. The DGT device for gradient thin film diffusion according to claim 1, characterized in that, The soil positioning device (2) includes two U-shaped forks (20) disposed below the detector mounting structure (10) and a connecting baffle (21) disposed between the two U-shaped forks (20). The U-shaped forks (20) are respectively arranged on both sides below the detector mounting structure (10) with their openings facing downwards; the U-shaped forks (20) are vertically provided with rib grooves (22).

3. The DGT device for gradient thin film diffusion according to claim 1, characterized in that, A gripper ring (113) is fixedly provided on the sealing cover (111). The bottom detection port (101) and the side detection port (102) are provided with snap-fit ​​grooves (114) around them; snap-fit ​​posts (115) are fixed in the snap-fit ​​grooves (114); The detection ring (110) is provided with connecting ears (116) around its perimeter, which can be engaged with the locking groove (114); the connecting ears (116) are provided with locking holes (117) that can be engaged with the locking post (115).

4. The DGT device for gradient thin film diffusion according to claim 1, characterized in that, A first circular baffle (13) is horizontally arranged on the upper surface of the detector mounting structure (10). The upper end of the sealing cover (111) is hinged to the lower surface of the first circular baffle (13); the lower end of the sealing cover (111) is snapped into the side detection port (102).

5. The DGT device for gradient thin film diffusion according to claim 4, characterized in that, The sealing cover (111) is provided with an extended detection module with an opening facing downwards.

6. The DGT device for gradient thin film diffusion according to claim 1, characterized in that, A second circular baffle (14) is horizontally provided on the upper end face of the detector mounting structure (10). The second circular baffle (14) has a groove (15) on its surface that corresponds to the side detection port (102); the sealing cover (111) is provided with a pull rope (16); the pull rope (16) pulls the sealing cover (111) upward and moves it through the groove (15).

7. A method of using a DGT device for gradient thin-film diffusion according to any one of claims 1-6, characterized in that, Includes the following steps: S1. Place the DGT detection device in the soil. Open the sealing cap (111) of the gradient film detector (11) installed on the bottom detection port (101) and the side detection port (102); hold the upper end of the detection installation structure (10) and let the soil positioning device (2) enter the soil; press the detection installation structure (10) so that its upper end is flush with the upper surface of the soil. S2, the gradient detection module is in close contact with the soil. Then, air is injected into the airbag (121) through the inflation port (122); the airbag (121) squeezes the gradient detection module (112) through the bottom detection port (101) and the side detection port (102), so that the gradient detection module (112) is in close contact with the soil for effective detection; the pressure data detected by the pressure sensor determines that the air pressure of the airbag (121) has reached the predetermined pressure, and the inflation stops. S3, Gradient Diffusion Detection The gradient detection module (112) utilizes the principle of free diffusion to allow heavy metal ions to diffuse through the filter membrane (1120) and the diffusion membrane (1121), and then be captured by the fixed membrane (1122), forming a linear gradient distribution on the diffusion membrane (1121).

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