Method for dividing sediment-water interface in water ecosystem

Abstract

The invention relates to a method for dividing a sediment-water interface in a water ecosystem. The method comprises the following steps: step 1, collecting a sediment columnar core sample at a preset sampling point by utilizing a gravity type sediment sampler; step 2, placing the collected sediment columnar core sample in a constant-temperature water tank, and performing simulated culture under the condition that the temperature is close to that of a sampling point; step 3, acquiring vertical distribution characteristics of the concentration of a target object in the columnar core sample of the sediment by adopting a flat plate type DGT device; step 4, enabling the concentration of the target object on the adsorption film to correspond to the one-dimensional section of the columnar core sample of the sediment to obtain the concentration distribution of the one-dimensional section of the target object of the environmental medium or the micro-interface; and 5, dividing the concentration of the target object into intervals according to the gradient limit value, and marking different colors to finish division. According to the method, the sediment-water interface in the water ecosystem can be accurately divided, and a scientific basis is provided for in-depth research on migration and transformation rules and environmental behaviors of various pollutants on the sediment-water interface.

Description

Technical field [0001] The invention relates to the technical field of environmental protection, and in particular to a method for dividing sediment-water interfaces in aquatic ecosystems. Background technique [0002] The Sediment-water interface (SWI) in the aquatic ecosystem is the habitat of benthic organisms and an important part of the aquatic ecosystem. It is also the most significant difference in physical, chemical and biological characteristics of natural water bodies. environmental boundaries. This interface is a "hot zone" where matter participates in environmental geochemical cycles and biological coupling. With the participation of microorganisms, substances near the sediment-water interface undergo a series of physical, chemical and biological reactions (such as migration, transformation, adsorption / desorption, diffusion, burial and bioturbation, etc.), which is the key to regulating and controlling the relationship between sediment and water bodies. An impo...

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Problems solved by technology

However, at present, there is no accurate and reliable method for determining the three-dimensional scale of this interface in the academic circles, which makes it necessary to construct some related models of the sediment-water interface, as well as to study the physical and chemical properties of various substances in the interface area in the aquatic ecosystem. and biological reactions lack certain scientific basis

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