Method for separating different forms of heavy metals in soil by using DGT (diffusive gradient in thin films) technique

Abstract

The invention relates to a method for performing form separation on soil heavy metals by using a different-thickness diffusive phase DGT (diffusive gradient in thin films) technique. The principle is as follows: the DGT diffusive phases have the dissociation capacity for organic dissociable heavy metals, and have different heavy metal dissociation quantities for different thicknesses, thereby causing the difference in quantities of heavy metals extracted by DGT; and when the difference is utilized to obtain the DGT dissociation kinetic formula, different forms (ionic, organic dissociable and non-movable) of soil heavy metals can be separated in situ. The invention provides a quick and convenient prediction method for evaluating contribution of organic dissociable heavy metals in the plant absorption of effective soil heavy metal content. The method can accurately evaluate the adsorption / desorbption diffusion process of heavy metals in soil and evaluate the release risk of heavy metals.

Description

technical field [0001] The invention belongs to the fields of environmental science and earth science, and in particular relates to a method for separating heavy metals in different forms by using DGT technology in environmental media such as soil, water body and sediment. Background technique [0002] Soil heavy metal pollution, especially farmland heavy metal pollution is a long-term complex problem in environmental governance in my country. Heavy metal pollution not only destroys the natural environment, but also seriously threatens human survival and health. How to monitor and control heavy metals in the environment has become a hot topic in recent years. The bioavailable forms of heavy metals that play a decisive role in the toxicity of heavy metals in soil have also become the focus of people's research. The commonly used heavy metal effective state extraction technology is a chemical method. Although this method is effective, it is restricted by a series of external...

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Problems solved by technology

[0003] Although the commonly used BCR three-step method and Tessier continuous extraction method can separate the various components of the effective state of heavy metals in the soil, the method based on chemical extractants will still be affected by chemical reagents, and it is easy to cause heavy metals in the extraction process. Changes in shape

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