Device and method for acquiring and storing sediment pore water sample

Abstract

A device for acquiring and storing a sediment pore water sample comprises a main body and sampling grid chambers, wherein a group of horizontal grooves are distributed on the main body in a grid manner, a 0.45mum aperture permeation membrane is covered on the surface of the main body, the periphery of the permeation membrane is fixed by a frame on the main body, and the grooves are filled with water to form the sampling grid chambers with a length 10-30mm, a width 1mm, a volume 10-30muL and an interval 1.0mm. The device is vertically inserted into sediment and taken out when ion diffusion is balanced, and the pore water sample in the sampling grid chamber is cooled into ice and freezing-stored under the air isolation condition. After the device is taken out, defreezing is carried out at room temperature under the air isolation condition, and the permeation membrane is pierced to get the pore water sample sucked out from the sampling grid chamber for analysis. The inventive device and method have pore water collection vertical resolution 2mm and balance time 1-3 days in sediment, and the pore water sample can be stored in the device for at least three months.

Description

technical field [0001] The invention relates to a device and method for quickly acquiring and storing interstitial water samples of lake and river sediments, which are suitable for the fields of sediment background investigation, sediment pollution evaluation and the like. Background technique [0002] With the improvement of human living standards and the continuous development of industrialization, environmental pollution has increasingly become a major problem that plagues the development of human society. Among them, water pollution is a more prominent problem, and sediment pollution is an important cause. A large amount of pollutants are accumulated in the sediment. When the environmental conditions change, the pollutants are released from the sediment to the water body, causing continuous and high-intensity pollution to the water body, threatening the ecological balance and water supply security. Sediment interstitial water, as the dissolved part, is a sensitive indic...

AI Technical Summary

Problems solved by technology

At present, the improvement of the interstitial water sample acquisition technology by using the interstitial water balance device is mainly aimed at shortening the acquisition time and improving the spatial resolution. How to adopt a suitable preservation method to avoid the interstitial water sample being oxidized by contact with air has not been reported.

Especially under the condition of miniaturization of the diffusion balance device, the amount of interstitial water samples obtained is greatly reduced. If not properly preserved, the properties of interstitial water samples will change fundamentally, resulting in distortion of the measurement results.

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