Sampling and pretreatment device of redox sensitive element containing water

Abstract

The invention provides a sampling and pretreatment device of redox sensitive element containing water. The device comprises a tank, a pull rod, a cover and a piston, a center hole is formed in the center of the top of the tank, a water filter pipe is arranged outside the center of the bottom of the tank, a filter membrane is arranged on the inner side of the center of the bottom of the tank, a shutoff valve is arranged on the water filter pipe, and a pipe opening of the water filter pipe is covered with the filter membrane. A sampling pipe is arranged at the bottom of the side wall of the tank, a water outlet pipe is arranged at the bottom of the sampling pipe, a three-way valve is arranged at the intersection portion of the water outlet pipe and the sampling pipe, the pull rod is sleeved with the tank, the top of the pull rod stretches out of the center hole, and a through shaft core is arranged in the axial center of the pull rod. The piston is connected with the bottom of the pull rod, a through hole is formed in the axial center of the piston, the through hole corresponds to the shaft core, and the cover and the top of the pull rod are connected in a configured mode. According to the sampling and pretreatment device, it can be avoided that redox sensitive elements are in contact with air to generate chemical changes in the water sample collecting process, the authenticity of water samples is guaranteed, the sampling device is directly utilized for suction filtration, cost is reduced, time is saved, efficiency is improved, dividing sampling is achieved, and flexibility and convenience are achieved.

Description

technical field [0001] The invention belongs to the technical field of water environment monitoring, in particular to a sampling and pretreatment device for water containing oxidation-reduction sensitive elements. Background technique [0002] With the rapid development of society and economy, the problem of surface water and groundwater pollution is becoming more and more serious, which has seriously threatened the sustainable development of human health and social economy. The restoration and treatment of surface water and groundwater pollution has become an urgent task. Due to the high cost and complicated process of pollution remediation, it is difficult to achieve the ideal remediation effect in actual operation. Therefore, before the actual remediation technology is applied, it is necessary to carry out soil column or sand tank laboratory experiments to explore the reaction and migration characteristics of related pollutants in the aquifer, and then guide the design of...

AI Technical Summary

Problems solved by technology

However, many pollutants are variable-valence elements, which are very sensitive to changes in redox conditions. If the sample is exposed to the air during sampling, these elements will react and affect the authenticity of the experimental results, especially in most soil columns at present. Under the condition of controlled water flow in the experiment, the flow rate is relatively slow, and the sampling takes a long time, and the commonly used sampling bottle is a wide-mouth bottle, so the collected water samples will be exposed to the air for a long time, and then undergo tedious pre-treatment of suction filtration process, the test results will be seriously distorted, which may lead to the failure of the experiment

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