A method for separating heavy metals in different forms in soil using DGT technology

Abstract

The present invention relates to a method for morphological separation of heavy metals in soil using diffusion phase DGT technology of different thicknesses. The principle is that DGT diffusion has the ability to dissociate relatively organic easily dissociated heavy metals, and the amount of dissociated heavy metals is different with different thicknesses, so that This leads to the difference in the amount of heavy metals extracted by DGT. Through this difference, the analytical DGT dissociation kinetic formula is obtained, which can realize the separation of different forms of soil heavy metals (ionic state, organic easily dissociable state and non-easy dynamic state) in situ. This method provides a fast and convenient prediction method for future evaluation of the contribution of organic and easily dissociable heavy metals in the available content of soil heavy metals absorbed by plants. At the same time, it also enables the evaluation of the adsorption / desorption / diffusion process of heavy metals in soil and the assessment of release risks to be carried out more accurately.

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...

AI Technical Summary

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

Images