Distribution characteristics and ecological risk assessment of heavy metals in sediments from Xiang River
SHENG Wei-kang1, HOU Qing-ye1, YANG Zhong-fang1, YU Tao1, YUAN Jia-xin1, DAI Gao-le1, TANG Zhi-min2
1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;
2. Nanjing Center of Geological Survey, China Geological Survey, Nanjing, Jiangsu 210016, China
The total contents of nine heavy metals (As、Cd、Cr、Cu、Hg、Ni、Pb、Sb、Zn)in sediments from Xiang River were analyzed. Geoaccumulation index (Igeo) was used to analyze the trend of pollution since 1982. The degrees of heavy metals pollution and potential aquatic organism risk were evaluated by using enrichment factor (EF) and logarithm regression models, respectively. Possible pollution source of heavy metals were deduced according to the results of principal component analysis (PCA). The results showed that the spatial distribution of these heavy metals in sediments in Xiang River were highly heterogeneous. In general, the Igeo of most heavy metals from whole Xiang River had increased slowly in the past 30 years with the exception that it decreased in the Changsha-Zhuzhou-Xiangtan section and Hengyang section. In Xiang River, the most polluted heavy metal was Cd, followed by As and Hg. ChenZhou was the most polluted area and its pollution could be characterized as the combined pollution dominated by Cd. There were two possible pollution sources of heavy metals in sediments. One source was the discharge of industrial wastewater including selecting and smelting wastewater, as well as the leakage of tailings ponds. The other source was the chemical weathering of rocks and river transportation.
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