1. School of Earth Science and Resources, Chang’an University, Xi’an 710054, Shaanxi 2. Xi’an Institute of Geology and Mineral Resources, China Geological Survey, Xi’an 710054, China
In order to provide scientific reference for the ecological control of the water and the risk assessment of sediment treatment, the authors analyzed the content level, the distribution characteristics and the content change trend of heavy metals such as Cu, Pb, Zn, Cd, As and Hg in water and Cr, Zn, Pb, Cu, Cd and Hg in sediments. The Nemerow Index and the Potential Ecological Risk Index were used to evaluate the accumulation degree and potential risk of heavy metal pollution in water bodies and sediments. The results show that the average content of six heavy metals in water is in the range of 0.005 7~4.796 0 mg/L, and the content exhibits the order of Zn>Cu>Cd>Pb>As>Hg. The content of As in the water body shows an increasing trend with water flow, while the other heavy metals content in water decreases obviously with the water flow. The average content of six heavy metals in the sediments is in the range of (61.6~5 999.3)×10 -6, with the order of Zn>Pb>Cu>Cd>Cr>Hg. The content of heavy metals in the sediments of the river sections has undulating changes, but the overall change trend is that the content of heavy metals in the sediments decreases obviously with flowing water. The main heavy metal pollutants in Dongdagou water are Cu, Pb, Zn and Cd, and the single factor pollution degree is in order of Cd>Pb>Zn>Cu. The Dongdagou water evaluated by the Nemerow Index shows that there are different degrees of polluted water in the river. The contaminations in sediments are heavy metal pollutants Cd, Hg, Pb and Cu, and the degree of ecological risk is in order of Cd>Hg>Pb>Cu>Zn>Cr. The evaluation of the sediments in Dongdagou by using the Potential Ecological Risk Index shows that the total potential ecological risk index of the sediments in the whole section of Dongdagou is serious.
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