Study on Trace Elements of Water in Xiaolangdi Reservoir,China

概要

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As one of the strategic projects, Xiaolangdi Dam Project has many functions, including flood control, water supply for municipal and irrigation, etc. And water quality of Xiaolangdi reservoir will directlyaffects industrial and agricultural production and health of residents in the reservoir area and downstream areas. So the fate of toxic heavy metals in water of the Xiaolangdi is highly concerned.Samples of surface water from Mingzhudao and Zhangling in the Xiaolangdi reservoir，were analyzed to assess the water quality. Nine trace elements, including Hg, Se, Cd，Cr, Cu, Zn, Fe, Mn and F were determined. Concentrations of As, Cr, Cu, and Zn were lower than the detection limit in the Xiaolangdi water.The mean concentration of mercury in the studied areas was higher than the III class of Chinese surface water quality standards limit, while other elements were lower than the limit. And the concentration of mercury increases as water depth increases，it may be due to sedimentation of mercury micro-organisms or biogeochemical cycle of mercury. Se and Cd in the XiaolangdiReservoir were distributed evenly, and their contents changed little with water depth.