A pumpless groundwater sampling device and sampling method for detecting inert gas

Abstract

A pumpless groundwater sampling device and sampling method for detecting inert gas, the sampling device comprising a sampler, an oxygen-free copper tube, and a sealing clamp; the sampler comprising a vertical tube, the top of which is connected to an exhaust one-way check valve and a lifting ring, the lifting ring being connected to a lifting rope; a liquid inlet and discharge port being provided at the bottom of the vertical tube, a check ball being provided inside the liquid inlet and discharge port; the bottom end of the liquid inlet and discharge port being connected to a regulator, the bottom of which is connected to a liquid discharge pipe; an inlet pipe and an outlet pipe being formed at both ends of the oxygen-free copper tube; the inlet pipe being connected to one end of a rubber tube, the other end of which is connected to the liquid discharge pipe of the regulator; each clamp body end of the sealing clamp having a pinching plane; using the device, through the steps of testing the buried depth of the groundwater level, lowering the sampler for sampling, connecting the sampler to allow the water sample to stably flow through the oxygen-free copper tube, and sealing both ends of the oxygen-free copper tube, a groundwater sample containing inert gas that meets the test requirements can be obtained in an existing pumpless well.

Description

Technical Field

[0001] The invention belongs to the technical field of groundwater sampling, and in particular relates to a groundwater pumpless sampling device and a sampling method for detecting inert gas. Background Art

[0002] Groundwater refers to the water found in the pores of soil and rock below the surface. More narrowly, it refers to the water in saturated aquifers below the groundwater table. Groundwater is a vital component of water resources. Due to its stable supply and high quality, it serves as a key source of water for agricultural irrigation, industrial mining, and urban areas. However, its origin remains a crucial scientific research question: whether it is shallowly circulating groundwater with a shallow crustal origin or deeply circulating groundwater with a mantle origin. Currently, deep groundwater samples collected from pumped wells are analyzed for noble gas content and isotopes to assess whether the source of groundwater is crustal or mantle, as well as its properties.

[0003] To investigate the origins of groundwater, the content and isotopic composition of noble gases in groundwater are crucial for studying the crust and mantle origins of groundwater, and sampling is therefore essential. While existing equipment can collect water samples, the sampling requirements for noble gases in groundwater are challenging due to their high sensitivity to atmospheric influences and tight sealing. This makes collecting noble gas samples in existing pumpless wells more difficult. Summary of the Invention

[0004] In view of the above problems, the purpose of the present invention is to provide a groundwater pumpless sampling device for detecting inert gas, which has a simple structure, does not require power supply, has low cost, is easy to operate, has good sealing performance, and can be reused many times.

[0005] Another object of the present invention is to provide a pumpless groundwater sampling method for detecting inert gases, which is simple to operate, does not require power supply, and can avoid contamination of the water samples by inert gases and other gases in the atmosphere.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A pumpless groundwater sampling device for detecting inert gas, comprising a sampler, an oxygen-free copper tube and a sealing clamp;

[0008] The sampler includes a vertical pipe, the top of which is connected to an exhaust one-way check valve, and a lifting ring is provided on the top of the vertical pipe, which is connected to a lifting rope; a transition section with a gradually decreasing inner diameter is provided at the bottom of the vertical pipe, and the bottom of the transition section is connected to a liquid inlet and outlet, and a check ball with a density greater than that of water is provided inside the liquid inlet and outlet, and the ball diameter of the check ball is smaller than the inner diameter of the vertical pipe and larger than the inner diameter of the liquid inlet and outlet; the bottom end of the liquid inlet and outlet is connected to a regulator, which includes a cannula, the top of which has an inclined notch, so that the outer diameter of the top of the cannula gradually decreases; the outer diameter of the cannula corresponds to the inner diameter of the liquid inlet and outlet, so that the cannula can be inserted into the liquid inlet and outlet and can lift the check ball; the middle of the cannula is provided with a regulating valve, and the bottom is connected to the drain pipe;

[0009] The inner diameters of the two ends of the oxygen-free copper tube are smaller than the inner diameter of the middle, so that the two ends of the oxygen-free copper tube form an inlet tube and an outlet tube respectively; the inlet tube is connected to one end of the rubber tube, and the other end of the rubber tube is connected to the drain pipe of the regulator;

[0010] The sealing pliers include two pliers bodies hinged in the middle, each pliers body end has a pinching plane corresponding to the inlet pipe and the outlet pipe, and the pinching planes of the two pliers bodies can overlap with each other.

[0011] Furthermore, the volume of the oxygen-free copper tube is 50 mL.

[0012] A pumpless groundwater sampling method for detecting inert gas, using the sampling device, comprises the following steps:

[0013] Step 1: Before sampling, use a water level depth measuring instrument to measure the water level depth of the target pumped well to determine the length of the hanging rope required for this sampling, the hanging rope length = water level depth + 2m;

[0014] Step 2: Fix one end of the lifting rope to the lifting ring at the upper end of the sampler, insert the regulator into the liquid inlet and outlet without touching the check ball, and open the regulating valve; slowly lower the sampler along the wellbore of the machine well, and stop lowering the lifting rope after the length of the lifting rope reaches the length determined in step 1. The target water sample enters the liquid inlet and outlet along the drainage pipe and the cannula and lifts the check ball until the target water sample fills the vertical pipe of the sampler, and then slowly lift the sampler out of the sampling machine well;

[0015] Step 3: Use the water sample to fully rinse the rubber tube, regulator and oxygen-free copper tube, repeat several times to ensure that the target water sample is fully rinsed, and then repeat step 2 again to obtain the final target water sample;

[0016] Step 4: Connect one end of the rubber tube to the drain pipe at the lower end of the regulator, and the other end to the inlet pipe of the oxygen-free copper tube; then push up the regulator to lift the check ball, so that the final target water sample flows steadily into the oxygen-free copper tube and is discharged through the outlet pipe until the water flow through the oxygen-free copper tube is stable and gas-free. At this stage, keep the outlet pipe opening of the oxygen-free copper tube higher than the inlet pipe opening;

[0017] Step 5: After the water flow through the oxygen-free copper tube is stable and there is no gas, maintain the stable water flow for more than 10 seconds, use the sealing pliers to cut off the outlet pipe and the inlet pipe of the oxygen-free copper tube in sequence, and it is qualified if there is no water leakage at both ends after cutting.

[0018] Furthermore, in step five, the outlet pipe of the oxygen-free copper tube is first cut flush with the sealing pliers, and a certain length is reserved. If no water seepage is determined by touching or wiping with paper after cutting the seal, the inlet pipe of the oxygen-free copper tube is cut by the same method; if there is no water seepage at the port of the inlet pipe, a qualified sample is taken and sent to the laboratory for testing; if there is water seepage at the ports of the inlet and outlet pipes, the seal is cut again at a port closer to the middle of the oxygen-free copper tube until the sample is qualified.

[0019] Furthermore, in step five, if water seepage is found after the inlet pipe and the outlet pipe are cut multiple times, replace the oxygen-free copper pipe and repeat step five until the sampling is qualified.

[0020] Furthermore, in step 2, the rate at which the water sample enters the vertical pipe is regulated by adjusting the opening of the regulating valve.

[0021] The beneficial effects of the present invention are:

[0022] 1. The device and method of the present invention can obtain groundwater samples containing inert gas in existing pumpless wells, which can prevent the water samples from coming into contact with the atmosphere and greatly reduce the contamination of the water samples by inert gases and other gases in the atmosphere;

[0023] 2. The device and method of the present invention have a wide range of application conditions and can be customized according to the conditions of different sampling wells. Compared with traditional pump sampling, the cost is lower and no power supply is required. At the same time, the device of the present invention also has the advantages of simple operation and low cost.

[0024] 3. The device of the present invention does not use electric equipment, does not need to connect wires to water, will not be corroded by water and leak electricity, and the sampler part can be used in various groundwater sampling operations and can be reused many times. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a groundwater pumpless sampling device for detecting inert gas according to the present invention.

[0026] Figure 2 The present invention is a schematic structural diagram of a sampler of a groundwater pumpless sampling device for detecting inert gas.

[0027] Figure 3 The present invention is a schematic structural diagram of a regulator of a groundwater pumpless sampling device for detecting inert gas.

[0028] Figure 4 The present invention is a schematic diagram of the working state of the sealing clamp of the groundwater pumpless sampling device for detecting inert gas. DETAILED DESCRIPTION

[0029] The structure of the present invention and the technical effects to be achieved will be described below with reference to specific embodiments and accompanying drawings. However, the selected embodiments are only for illustration and explanation and are not intended to limit the scope of the present invention.

[0030] like Figure 1 As shown, the present invention provides a pumpless groundwater sampling device for detecting inert gas, comprising a sampler 1, an oxygen-free copper tube 2 and a sealing clamp 3.

[0031] like Figure 2 As shown, the sampler 1 includes a vertical tube 11. The vertical tube needs to be made of high-density material or have a counterweight added to ensure that it can sink into the water when there is no water in the vertical tube. The top of the vertical tube 11 is connected to an exhaust one-way check valve 12, which plays a role in exhausting air and discharging the water sample in the vertical tube 11 from the inside to the outside. It ensures that the water sample enters from the bottom of the vertical tube 11, while the upper end cannot enter water and can only discharge air or discharge water in one direction. The top of the vertical tube 11 is provided with a lifting ring 13, which is connected to the lifting rope 4. The lifting rope 4 of different lengths can be selected according to the depth of the groundwater level and the sampling requirements. The vertical tube 11 is the main container for water sampling. The volume is determined by the diameter and length. Different diameters and lengths can be selected according to the diameter of the sampling wellbore. If conditions permit, a vertical tube 11 with a larger volume can be selected. The bottom of the vertical tube 11 is provided with a transition section 14 with a gradually decreasing inner diameter. The bottom of the transition section 14 is connected to the liquid inlet and outlet 15. The interior of the liquid inlet and outlet 15 is equipped with a check ball 16, such as a plastic ball, having a density slightly greater than that of water. The diameter of the check ball 16 is smaller than the inner diameter of the vertical tube 11 and larger than the inner diameter of the liquid inlet and outlet 15. When the sampler 1 moves downward in the water body, the water flow entering the liquid inlet and outlet 15 can lift the check ball 16, allowing the water flow to enter the vertical tube 11. When the sampler 1 is stationary or moving upward in the water body, the check ball 16 blocks the transition section 14 under the combined action of gravity and water pressure, preventing the water sample from flowing out of the liquid inlet and outlet 15.

[0032] The bottom end of the liquid inlet and outlet 15 is connected to the regulator 5 to adjust the rate at which the water sample enters the vertical pipe 11. Figure 3As shown, the regulator 5 includes a cannula 51, the top of which has an inclined notch 52, so that the outer diameter of the top of the cannula 51 gradually decreases. The outer diameter of the cannula 51 corresponds to the inner diameter of the liquid inlet and outlet 15, so that the cannula 51 can be inserted into the liquid inlet and outlet 15 and can lift the check ball 16. When the top of the cannula 51 lifts the check ball 16, the water sample in the vertical pipe 11 can flow out through the liquid inlet and outlet 15. The middle of the cannula 51 has a regulating valve 53, and the bottom is connected to the drain pipe 54. The regulating valve 53 can adjust the rate at which the water sample enters the vertical pipe 11 when the sampler 1 is in the water body, and adjust the rate at which the water sample flows out of the vertical pipe 11 after the sampler 1 is taken out.

[0033] like Figure 1 As shown, the inner diameters of the oxygen-free copper tube 2 at both ends are smaller than the inner diameter in the middle, forming an inlet tube 21 and an outlet tube 22 at each end. The inlet tube 21 connects to one end of a rubber tube 6, the other end of which connects to the drain tube 54 of the regulator 5. The oxygen-free copper tube 2 is the main body for sealing water samples containing inert gas, used to store them for laboratory testing. The oxygen-free copper tube 2 is vacuum-sealed, air-free, and typically holds 50 mL of water.

[0034] like Figure 1 、 Figure 4 As shown, the sealing pliers 3 includes two pliers bodies 31 hinged in the middle, and the end of each pliers body 31 has a pinching plane 32 corresponding to the inlet pipe 21 and the outlet pipe 22. The pinching planes 32 of the two pliers bodies 31 can overlap with each other to pinch off the inlet pipe 21 and the outlet pipe 22. The sealing pliers 3 can be used to pinch off the inlet pipe 21 and the outlet pipe 22 and seal them at the same time to prevent the water sample from flowing out and the inert gas and other gases in the atmosphere from entering the oxygen-free copper tube 2 and contaminating the water sample.

[0035] The present invention also provides a pumpless groundwater sampling method for detecting inert gas, using the sampling device, the sampling method comprises the following steps:

[0036] Step 1: Before sampling, use a water level depth measuring instrument to measure the water level depth of the target pumped well to determine the length of the lifting rope 4 required for this sampling. The length of the lifting rope = water level depth + 2m;

[0037] Step 2: Fix one end of the lifting rope 4 to the lifting ring 13 at the upper end of the sampler 1, insert the regulator 5 into the liquid inlet and outlet 15 without touching the check ball 16, and open the regulating valve 53; slowly lower the sampler 1 along the wellbore, and stop lowering the lifting rope 4 after the length of the lifting rope 4 reaches the length determined in step 1. The target water sample enters the liquid inlet and outlet 15 along the drainage pipe 54 and the cannula 51 and lifts the check ball 16 until the target water sample fills the vertical pipe 11 of the sampler 1, and then slowly lift the sampler 1 out of the sampling well; by adjusting the opening of the regulating valve 53, the rate at which the water sample enters the vertical pipe 11 can be adjusted;

[0038] Step 3: Use the water sample to fully rinse the rubber tube 6, the regulator 5 and the oxygen-free copper tube 2. Repeat several times to ensure that the target water sample is fully rinsed, and then repeat step 2 again to obtain the final target water sample.

[0039] Step 4: Connect one end of the rubber tube 6 to the drain pipe 54 at the lower end of the regulator 5, and the other end to the inlet pipe 21 of the oxygen-free copper tube 2; then push the regulator 5 upward to lift the check ball 16, so that the final target water sample flows steadily into the oxygen-free copper tube 2 and is discharged through the outlet pipe 22 until the water flow through the oxygen-free copper tube 2 is stable and gas-free. At this stage, keep the outlet pipe 22 of the oxygen-free copper tube 2 higher than the inlet pipe 21.

[0040] Step 5: After the water flow through the oxygen-free copper tube 2 is stable and there is no gas, maintain the stable water flow for more than 10 seconds, use the sealing pliers 3 to cut the outlet pipe 22 and the inlet pipe 21 of the oxygen-free copper tube 2 in sequence. If there is no water leakage at both ends after cutting, it is qualified. The oxygen-free copper tube 2 is protected and wrapped, and then sent to the laboratory for standby testing.

[0041] Specifically, in step five, the outlet pipe 22 of the oxygen-free copper tube 2 is first cut flush with the sealing pliers 3, and a certain length is reserved. If no water seepage is detected by hand or paper wiping after cutting and sealing, the inlet pipe 21 of the oxygen-free copper tube 2 is cut in the same way; if there is no water seepage at the port of the inlet pipe 21, a qualified sample is sent to the laboratory for testing; if there is water seepage at the ports of the inlet pipe 21 and the outlet pipe 22, the seal is cut again at a port closer to the middle of the oxygen-free copper tube 2 until the sample is qualified. If there is water seepage after cutting the inlet pipe 21 and the outlet pipe 22 multiple times, another oxygen-free copper tube 2 is replaced and step five is repeated until the sample is qualified.

[0042] The sampling device and sampling method of the present invention have a wide range of usage conditions and can be customized according to the conditions of different sampling wells. The sampling device does not use electric equipment and does not need to connect wires to the water, so it will not be corroded by water and leak and fail. The sampler part can be used in a variety of groundwater sampling work and can be reused many times. At the same time, the present invention also has the advantages of simple device operation and low cost.

[0043] The present invention is defined by the claims, but those skilled in the art may make various obvious changes or modifications based on the claims, all of which are within the spirit and scope of the present invention.

Claims

1. A pumpless groundwater sampling device for detecting inert gas, characterized in that: Includes sampler, oxygen-free copper tube and sealing clamp; The sampler includes a vertical pipe, the top of which is connected to an exhaust one-way check valve, and a lifting ring is provided on the top of the vertical pipe, which is connected to a lifting rope; a transition section with a gradually decreasing inner diameter is provided at the bottom of the vertical pipe, and the bottom of the transition section is connected to a liquid inlet and outlet, and a check ball with a density greater than that of water is provided inside the liquid inlet and outlet, and the ball diameter of the check ball is smaller than the inner diameter of the vertical pipe and larger than the inner diameter of the liquid inlet and outlet; the bottom end of the liquid inlet and outlet is connected to a regulator, which includes a cannula, the top of which has an inclined notch, so that the outer diameter of the top of the cannula gradually decreases; the outer diameter of the cannula corresponds to the inner diameter of the liquid inlet and outlet, so that the cannula can be inserted into the liquid inlet and outlet and can lift the check ball; the middle of the cannula is provided with a regulating valve, and the bottom is connected to the drain pipe; The inner diameters of the two ends of the oxygen-free copper tube are smaller than the inner diameter of the middle, so that the two ends of the oxygen-free copper tube form an inlet tube and an outlet tube respectively; the inlet tube is connected to one end of the rubber tube, and the other end of the rubber tube is connected to the drain pipe of the regulator; The sealing pliers include two pliers bodies hinged in the middle, each pliers body end has a pinching plane corresponding to the inlet pipe and the outlet pipe, and the pinching planes of the two pliers bodies can overlap with each other.

2. The pumpless groundwater sampling device for detecting inert gas according to claim 1, characterized in that: The volume of the oxygen-free copper tube is 50 mL.

3. A pumpless groundwater sampling method for detecting inert gas, characterized in that: Utilizing the sampling device according to claim 1 or 2, the sampling method comprises the following steps: Step 1: Before sampling, use a water level depth measuring instrument to measure the water level depth of the target pumped well to determine the length of the hanging rope required for this sampling, the hanging rope length = water level depth + 2m; Step 2: Fix one end of the lifting rope to the lifting ring at the upper end of the sampler, insert the regulator into the liquid inlet and outlet without touching the check ball, and open the regulating valve; slowly lower the sampler along the wellbore of the machine well, and stop lowering the lifting rope after the length of the lifting rope reaches the length determined in step 1. The target water sample enters the liquid inlet and outlet along the drainage pipe and the cannula and lifts the check ball until the target water sample fills the vertical pipe of the sampler, and then slowly lift the sampler out of the sampling machine well; Step 3: Use the water sample to fully rinse the rubber tube, regulator and oxygen-free copper tube, repeat several times to ensure that the target water sample is fully rinsed, and then repeat step 2 again to obtain the final target water sample; Step 4: Connect one end of the rubber tube to the drain pipe at the lower end of the regulator, and the other end to the inlet pipe of the oxygen-free copper tube; then push up the regulator to lift the check ball, so that the final target water sample flows steadily into the oxygen-free copper tube and is discharged through the outlet pipe until the water flow through the oxygen-free copper tube is stable and gas-free. At this stage, keep the outlet pipe opening of the oxygen-free copper tube higher than the inlet pipe opening; Step 5: After the water flow through the oxygen-free copper tube is stable and there is no gas, maintain the stable water flow for more than 10 seconds, use the sealing pliers to cut off the outlet pipe and the inlet pipe of the oxygen-free copper tube in sequence, and it is qualified if there is no water leakage at both ends after cutting.

4. The pumpless groundwater sampling method for detecting inert gas according to claim 3, characterized in that: In the step five, the outlet pipe of the oxygen-free copper tube is first cut off flush with the sealing pliers, and a certain length is reserved. If no water seepage is determined by touching or wiping with paper after cutting the seal, the inlet pipe of the oxygen-free copper tube is cut off in the same way; if there is no water seepage at the port of the inlet pipe, a qualified sample is taken and sent to the laboratory for testing; if there is water seepage at the ports of the inlet pipe and the outlet pipe, the seal is cut off again at a port closer to the middle of the oxygen-free copper tube until the sample is qualified.

5. The pumpless groundwater sampling method for detecting inert gas according to claim 4, characterized in that: In step 5, if water seepage still exists after the inlet pipe and the outlet pipe are cut multiple times, replace the oxygen-free copper pipe and repeat step 5 until the sampling is qualified.

6. The pumpless groundwater sampling method for detecting inert gas according to any one of claims 3 to 5, characterized in that: In the step 2, the rate at which the water sample enters the vertical pipe is regulated by adjusting the opening of the regulating valve.

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