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Ecological risk assessment of heavy metals in water of Xinjiang Area |
LI Qiang1, LIU yun-qing1, CHEN Wang-xiang1, WANG Xing-lei1, ZHOU Xiao-hua1, FENG Wei-ying2 |
1. Yili Normal University, Yining 835000, China; 2. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China |
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Abstract The exposure characteristics of heavy metals in surface aquatic environments of Xinjiang area were analyzed, the safety threshold method was employed to evaluate the ecological risks of 6kinds of typical heavy metals. The results showed that the average order of heavy metals exposure concentration was Ni > Zn > Cu > Cr > Cd > Pb, all heavy metals under the health standards for drinking water of WHO. The ecological risk assessment of heavy metals showed that MOS10 of six heavy metals were more than one, the probability of exposure concentrations (Cr, Cd, Cu, Pb, Ni and Zn) more than the concentrations of affecting 10% aquatic organisms were 9.95%, 9.40%, 9.40%, 1.72%, 6.08% and 0, the ecological risk to aquatic organisms was negligible for a short time respectively. Nevertheless, for a long time, MOS10 of Zn were more than one, MOS10 of Cr, Cd, Cu, Pb and Ni were less than one, respectively. The probability of exposure concentrations (Cr, Cd, Cu, Pb, Ni and Zn) more than the concentrations of affecting 10% aquatic organisms were 15.40%, 12.01%, 24.80%, 15.70%, 98.25% and 0, which revealed that ecological risk of Zn was negligible, and ecological risks of Cr, Cd, Cu, Pb and Ni were higher on aquatic organisms, and the ecological risk of six main heavy metals was in order Ni > Cu > Pb > Cr > Cd > Zn.
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Received: 15 October 2017
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