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Effects of Salinity of Porewater on Arsenic Speciations in Sediments of Bosten Lake in Xinjiang, Northwest China

Bosten Lake lies in semi-arid of the southern Xinjiang with hot summer, low precipitation and will be salinized and in which water plays a strategic role. The most toxicity trace metal arsenic (As) in lake sediment was taken as an object to study the environment effects when the water is increasingly salinized. Through sampling around the obviously salinity gradient area, the 191 field data were used to analyze the effect of salinity of porewater on the change of As risk to the environment. From the sample distribution between the As speciation (the As in the porewater, the exchangeable fraction and the carbonate fraction of the sedimentary As) vs. EC (salinity index), and ions concentration of Cl-, SO42-, Na+, Mg2+, K+ and Ca2+, it is inferred that the As risk is decreased when the water salinity is increasing.