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《Geochimica》 2017-06
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Pollution characteristics and ecological risk of heavy metals in the surface sediments of the inlets of Dongting Lake, China

LI Fen-fang;LI Li-qiang;FU Zhe;YIN Yu-ying;LIU Yan;Dongting Lake Eco-Environmental Monitoring Center;  
The concentrations, distribution characteristics, and pollution trends of nine heavy metals(As, Hg, Cd, Pb, Sb, Cu, Ni, Cr, and Zn) in the surface sediments of the seven rivers around Dongting Lake, China, were analyzed. The geo-accumulation index, Nemerow integrated pollution index, and a logistic regression model were used to evaluate the heavy metal pollution and potential ecological risk. The results showed that the mean concentrations of the nine heavy metals in the sediment samples ranged from 0.257 mg/kg to 123 mg/kg. The heavy metal contents followed the order Zn Cr Pb Cu Ni As Cd Sb Hg. Over the past 30 years, the most severe heavy metal accumulation occurred in the surface sediments of the Xiangjiang River inlet of Dongting Lake, especially for Hg and Cd. The geo-accumulation index and Nemerow single factor pollution index showed that the accumulative effects of Cd and Hg in the study area were significant. Based on the geo-accumulation index and Nemerow multi-factor synthesis pollution index, the accumulative degree of heavy metal pollution in the surface sediments of Dongting Lake rivers followed the order Xiangjiang River Zijiang River Yuanjiang River Miluojiang River Lijiang River Songzihe east branch River Xinqianghe River. The logistic regression models showed that there was most likely a high potential aquatic risk in Xiangjiang River inlet, Zijiang River inlet, and Yuanjiang River inlet sediments. The order of the potential for harm by heavy metals followed the order Xiangjiang River(most likely) Zijiang River(most likely) Yuanjiang River(most likely) Lijiang River(likely) Miluojiang River(likely) Songzihe River(likely) Xinqianghe River(no harm). The order of the potential bio-toxicological risk of each heavy metal in the whole study area was as follows As Sb Cd Ni Hg Cr Pb Zn Cu.
【Fund】: 湖南省环境保护科技计划(2015015)
【CateGory Index】: X52;X826
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