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Split type gas displacement type underground water sampler

A gas replacement and groundwater technology, applied in the direction of sampling devices, etc., can solve problems such as overflow, gas, and large disturbance of groundwater, and achieve the effects of low gas pressure, high sampling efficiency, and small gas consumption

Inactive Publication Date: 2010-06-02
NORTHWEST INST OF NUCLEAR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a split-type gas displacement groundwater sampler, which realizes groundwater sampling under low pressure and small gas volume conditions compared with conventional gas displacement samplers, and solves the problem of large disturbance of groundwater and the presence of gas during sampling. Technical problems such as overflow phenomenon

Method used

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  • Split type gas displacement type underground water sampler
  • Split type gas displacement type underground water sampler
  • Split type gas displacement type underground water sampler

Examples

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Effect test

Embodiment 1

[0033] Example 1: There is a monitoring well with a water level of 30 meters, and it is desired to obtain 200 liters of groundwater samples at a depth of 200 meters from the ground. Lower the sample holding tube and sampling unit into the monitoring well. The sample holding pipe 18 will be fixed at 10 meters below the water surface (that is, the depth of 40 meters from the ground), and the sampling unit will be lowered with the outlet pipe to drive the spiral plastic hose to a depth of 200 meters from the ground. To ensure that the sampling unit falls vertically in the well, tie a stainless steel or PVC weight to the bottom of the sampling unit. Groundwater sampling is realized by controlling the working gas pressure to 0.5Mpa. In this embodiment, the average sampling speed of the water sample is 2 L / min, and the sampling process of the water sample is completed after working for 100 minutes.

Embodiment 2

[0034] Embodiment 2: There is a monitoring well with a water level of 30 meters, and it is desired to obtain 50 liters of groundwater samples at a depth of 350 meters from the ground. During implementation, the sample holding tube and sampling unit are lowered into the monitoring well. The sample holding pipe will be fixed at 10 meters below the water surface (that is, at a depth of 40 meters from the ground), and the sampling unit will be lowered with the outlet pipe, driving the spiral plastic hose to a depth of 350 meters from the ground. Groundwater sampling is realized by controlling the working gas pressure to 0.5Mpa. In this embodiment, the average sampling speed of the water sample is 1 L / min, and the sampling process of the water sample is completed after working for 50 minutes.

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Abstract

The invention relates to a split type gas displacement type underground water sampler which comprises a sample containing pipe, an inflation and deflation unit and a water acquirement pipeline; the inflation and deflation unit comprises an air source, an air pipe and an air pressure controller, the upper end of the sample containing pipe is communicated with the inflation and deflation unit, and the water acquirement pipeline comprises a water outlet pipe. The underground water sampler also comprises a sampling unit, wherein the sampling unit comprises a water outlet non-return valve, a tee and a water inlet non-return valve which are sequentially communicated from top to bottom; the water acquirement pipeline also comprises a hose which is communicated with the lower end of the sample containing pipe and a middle outlet of the tee, and the water outlet non-return valve is communicated with the water outlet pipe. The invention solves the technical problems of large disturbance of underground water, existence of a gas spilling phenomenon and the like during sampling. The invention realizes the sampling of the underground water under the conditions of low air pressure and small gas quantity and has the advantage of high sampling efficiency.

Description

technical field [0001] The invention relates to a ground water sampler, in particular to a gas displacement type ground water sampler. Background technique [0002] In the investigation of groundwater pollution, obtaining representative groundwater samples from monitoring wells is the first step in investigation and monitoring. At present, the types of groundwater samplers mainly include: bucket sampler, negative pressure lift sampler, gas displacement sampler, pneumatic impeller pump, electric submersible pump, inertial lift pump, etc. (1.ASTM standard: D6634Standard guide for the selection of purging and sampling devices for groundwater monitoring wells; 2. Zheng Jitian, Wang Jianzeng, A Review of Overseas Groundwater Pollution Survey Sampling Techniques, Survey Science and Technology http: / / 171.131.80.13 / kns50 / Navi / Bridge.aspx?DBCode=cjfd&LinkType=BaseLink&Field= The BaseII sampler uses the pressure of the gas to drive the groundwater to the ground. It is composed of a p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/10
Inventor 刘文元柯昌凤涂国荣王旭辉段荔周晓华
Owner NORTHWEST INST OF NUCLEAR TECH
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