Distribution and Speciation of Selenium, Antimony, and Arsenic in Soils and Sediments Around the Area of Xikuangshan (China)

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• 作者：Hailin Yang and Mengchang He
• 刊名：CLEAN 胠SOIL, AIR, WATER
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：44
• 期：11
• 页码：1538-1546
• 全文大小：1122K
• ISSN：1863-0669

文摘

Selenium (Se), antimony (Sb), and arsenic (As) throughout the world naturally or anthropogenically in the environment are of great concern. In this study, the distribution and speciation of Se, Sb, and As in four types of environmental matrices (paddy soils, dry-land soils, soil profiles, and sediments) from an antimony mine area were investigated. Significant correlations between the total Se and Sb and As contents were observed, which, in association with the geochemical fractions and species, may help predict the distribution and availability of these metalloids in mining/smelting-impacted soils and sediments. The maximum Se, Sb, and As concentrations were found in the sediments, where a significant decrease in the soluble and exchangeable fractions and an increase in the residual fraction were observed with an increasing distance from the river's headstream. In the environment, Se, Sb, and As are commonly present as either Se(IV), Se(VI), Sb(III), Sb(V), As(III), or As(V). These inorganic forms of Se, Sb, and As, as well as methylated forms, are subject to various biogeochemical processes with natural components, such as organic matter and mineral phases. Because of the toxicity and persistency of metalloids, a better understanding of Se, Sb, and As speciation is crucial for predicting and protecting environmental health.