Lake water body DGT testing device and method

Abstract

The invention provides a lake water body DGT testing device. The lake water body DGT testing device comprises a floating ball and a plurality of water sampling units. Each water sampling unit is provided with a DGT detection device, a water quality multi-parameter probe detection device and a water sampling device. The water sampling device comprises a plurality of sampling bottles, a peristalticpump and a control device, wherein each sampling bottle is provided with a sample injection pipe and an exhaust pipe; a one-way electromagnetic valve is arranged on each of the sample injection pipe and the exhaust pipe; a water sample outlet of the peristaltic pump is connected with the sample injection pipes of the plurality of sampling bottles through a first multi-pass joint; meanwhile, the exhaust pipes of the plurality of sampling bottles are connected to an exhaust manifold through a second multi-pass joint; and the control device is connected with the peristaltic pump and each one-wayelectromagnetic valve. The device provided in the invention can ensure a circular DGT in-situ test of a multi-layer water depth of a lake water body, can synchronously collect a multi-layer water sample and determine physicochemical properties, and is suitable for researching distribution characteristics of multi-layer nutrient elements of a deepwater lake profile.

Description

Technical field [0001] The invention belongs to the research field of lake water body eutrophication mechanism and DGT (gradient diffusion film) technology, and specifically relates to a lake water body DGT test device and a test method. Background technique [0002] DGT (Gradient Diffusion Film) technology can be used to monitor available metals / nutrients / oxyanions in water / sediments / soil. The principle is that DGT measures the amount of solute that diffuses through the concentration gradient of the diffusion glue and the filter membrane. After the solute passes through the diffusion layer of the DGT device, it is quickly bonded by the fixed glue. The fixed glue is behind the diffusion glue and continuously faces The solute is removed and the concentration gradient during operation is maintained (Zhang et al., 1995). Based on Fick’s first law, the time average flux of DGT (F) and the time average concentration of DGT / solution interface (C DGT ). [0003] In the prior art, the ci...

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Problems solved by technology

[0008] The present invention solves the technical problem that the DGT test device in the prior art cannot realize the in-situ test of DGT at multiple water depths, and cannot collect water samples in the DGT test area synchronously, and cannot simultaneously measure the physical and chemical properties of the water body, and further provides a A DGT test device that can simultaneously realize the in-situ DGT test of the surface layer, the middle layer, and the three layers of water overlying the sediment, and simultaneously obtain the DGT concentration of nitrogen and phosphorus in the lake water profile, the concentration of the water body and the physical and chemical properties of the conventional analysis method, and can be sampled simultaneously. The present invention also provides a testing method based on the DGT testing device

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