Lake columnar sediment DGT probe testing device and testing method

Abstract

The invention provides a lake columnar sediment DGT probe testing device, which comprises a sampling pipe, a movable mud blocking device, a limiting mechanism, a hammering device and a floating ball,wherein a sedimentation limiting device is arranged on the outer wall face of the sampling pipe, and a DGT probe and a multi-parameter water quality detection electrode are installed in the sampling pipe; the movable mud blocking device comprises a connecting rod and a mud blocking plate, and the connecting rod rotates around a rotating shaft to drive the mud blocking plate to move to the side ofthe sampling pipe from the position where the opening in the lower end of the sampling pipe is closed; the limiting mechanism is detachably mounted outside the sampling pipe and used for limiting themovable mud blocking device and limiting the mud blocking plate to the side of the sampling pipe; the hammering device is positioned above the sampling pipe and is fixedly connected with the samplingpipe; and the floating ball is located above the hammering device and connected with the hammering device through a first pull rope. The testing device disclosed by the invention can be used for carrying out an in-situ DGT test, and meanwhile, the multi-parameter water quality detection electrode can be used for finishing a physical and chemical property test of surface sediments and finishing thecollection of columnar sediment samples in a DGT testing area.

Description

technical field [0001] The invention belongs to the fields of lake water environment science and earth environment chemistry, and in particular relates to a DGT probe test device and a test method for lake columnar deposits. Background technique [0002] Gradient diffusion film (Diffusive Gradients in Thin-films, DGT) technology mainly uses Fick's first diffusion law, by studying the gradient diffusion of elements in the DGT diffusion layer and its buffer kinetics, the effective state content and Information on spatial distribution, ion-complex binding kinetics, and solid-liquid exchange kinetics. DGT technology can be applied to many aspects of environmental research, including: geochemical characteristics of sediments, water quality monitoring, kinetic process of measured ions at the interface between DGT and soil, and bioavailability of heavy metals. [0003] The traditional analysis of active elements in the void water of lake sediments mainly collects sediment columnar...

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Problems solved by technology

[0005] The present invention solves the problem that the DGT test device in the prior art does not have the sediment sampling function, cannot synchronously collect the overlying water or sediment samples in the DGT test area, cannot realize the simultaneous measurement of the environmental condition parameters of the sediment, and is difficult to operate To solve the technical problems, and then provide a lake columnar sediment DGT probe test device that is easy to operate and can realize simultaneous sampling and environmental condition determination. The present invention also provides a test method based on the test device

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