Ecological risk assessment and source analysis of heavy metals in sediments of Liujiang River Catchment
Xiao-Yu ZHONG1, Tian-Sheng WU1, Jie LI1(), Guo-Dong ZHEN1, Xiao-Xiong ZHUO1, Dong-Chao GUAN2, Lei WANG3, Bing-Ji MO4
1. Guangxi Geological Survey,Nanning 530023,China 2. Guangxi Geological and Mineral Testing Research Center,Nanning 530023,China 3. Geology Team No.4 of Guangxi, Nanning 530031, China 4. Institute of Regional Geological Survey of Guangxi,Guilin 541003,China
In this study, 91 sediment samples were collected from the middle and lower reaches of Liujiang River. The geochemical characteristics of As, Cd, Cr, Cu, Hg, Ni, Pb, Zn and other elements were analyzed. The current pollution situation and potential risks were predicted and evaluated, and the sources of heavy metals were analyzed. The results show that: The spatial dispersion of elements in the sediments of Liujiang River Catchment is relatively large, and the distribution of heavy metal elements shows strong regional characteristics.Distribution of heavy metal elements in Liujiang River Catchment shows strong regional characteristics.As, Cr, Cu, Hg and Ni are mainly from natural sources, while Cd and Pb are mainly from human sources. The high-value areas of Cd natural source contribution mainly distribute in Longjiang River Catchment, while the high-value areas of industrial and mining sources contribution mainly distribute around Jincheng River and Liuzhou District of Liujiang River.
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