Freezing sampler for sediments in different depth of rivers or lakes

Abstract

The invention provides a freezing sampler for sediments in different depth of rivers or lakes. The upper end of a conical head is fixedly connected with the lower end of a sampling tube. A liquid nitrogen inducing tube is arranged in the sampling tube. The liquid nitrogen inducing tube and a venting joint are respectively and fixedly connected with an end cover 5. The lower end of the venting joint is communicated with the sampling tube. The upper end of the sampling tube is in threaded connection with the end cover. A sealing gasket is arranged between the sampling tube and the end cover. Cable holes are arranged on the end cover. The freezing sampler has a maximum sampling depth of 1.5 m in relative to the limited sampling depth of a common gravity-type columnar sampler, and the depth range of sediment sampling is enlarged. The freezing sampler, in relative to a freezing sampler which uses dry ice as a freeze agent, has the sampling tube with an appropriate thickness of tube diameter, is suitable for both loose and hard sediments, and the scope of application is expanded, and the freezing sampler has the advantages of low cost and fast and convenient sampling. Through use of the freezing sampler, disturbance on the sediments is smaller, undisturbedness of the sediments in different depth can be greatly maintained, and the accuracy of the sample analysis of the sediments can be improved.

Description

technical field [0001] The invention relates to a frozen sampler used for sediments of different depths in rivers or lakes, and belongs to the technical field of frozen samplers. Background technique [0002] The sediment of a river or lake is a mud-like substance composed of clay, silt, sand, organic matter or various minerals deposited in the bottom area of ​​a water body. For the river course, the sediment mainly comes from the erosion of soil, the decomposition of animal and plant organisms, and the particulate matter contained in the sewage discharged into the river course. Exogenous substances enter the lake and are deposited in the sediment. As the main reservoir of pollutants in rivers and lakes, the sediment can not only directly reflect the pollution history of the water body, but also under certain conditions, the pollutants in the sediment can also be released to the overlying water body through desorption, dissolution, biodegradation, etc. Various pollutants a...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the problem that the sampling depth of the existing bottom mud sediment sampler is small, and the original state of the sample is poor, and then provide a kind of frozen sampler for bottom mud of different depths in rivers or lakes

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