EEMs characteristics of dissolved organic matter in water environment and its implications for antimony contamination in antimony mine of Xikuangshan, Hunan Province

Abstract

Dissolved organic matter (DOM) is an important factor affecting the migration and transformation of antimony(Sb). The Hunan Xikuangshan Sb mine is the largest Sb mine in the world and antimony pollution in the aquatic environment is serious. To determine the characteristics of DOM in the water environment of the Xikuangshan mining area and its influences, three-dimensional fluorescence analysis was performed on the water environment samples of the Xikuangshan mining area. PARAFAC was used to extract the natural organic components in the water environment and the relationship between each component and Sb was explored. The analysis shows that the DOM in the water environment of the mining area is characterized by low humification and mixed sources of terrestrial and microbial sources, and most water samples are mainly terrestrial organic matter. There are three different components in the water body of the Sb mining area of Xikuangshan: the C1 component is terrestrial humus; the C2 component is quinone humus; the C3 component is protein-like (tyrosine). The relative content of the C1 component in the water environment is the highest and the relative content of the C3 component in surface water is higher than that in groundwater. Studies have shown that there are the following ways to affect the release of Sb in the groundwater environment: (1) the complexation of protein-like components with Sb promotes the dissolution and release of Sb; (2) the direct complexation of humus components with Sb. The relative content of natural organic components in surface water with low Sb is affected by dilution. The relative content of natural organic components in surface water with high Sb has a certain indication for the source of Sb.

Keywords

• antimony mine of xikuangshan
• antimony
• dissolved organic matter
• excitation-emission-matrix spectra