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| Bioavailability and ecological risk assessment of heavy metals in surface sediments of Lake Chaohu |
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Abstract Surface sediment samples were taken from Lake Chaohu, total and fractions of six heavy metals (Cd, Cr, Cu, Zn, Ni and Pb) were studied. The pollution of heavy metals were evaluated by the potential ecological risk index (RI) and risk assessment code (RAC). Heavy metal distribution of surface sediment indicated a higher degree of contamination in the west regions, and then the east regions, the content of heavy metals in Nanfei inflow river area are higher from 1.09to 1.21times than the whole lake. Fractions of heavy metals analysis showed that Cr, Ni and Cu existed mainly in residual fraction (82.99%, 63.63% and 54.25%) and the weak acid soluble fraction was the dominant for Cd and Zn (55.96% and 35.84%), while Pb was found mainly in the reducible fraction and oxidizable fraction (39.66% and 24.56%). Potential ecological risk assessment showed that High pollution level regions were distributed in Nanfei inflow river area (351.54~381.17). The risk assessment code showed that Cd had very high risk level, Zn had high risk level, Cu and Ti were between low risk and medium risk level, Pb was between no risk and low risk level, Cr posed no risk. Therefore, emergent management measures must be taken to control pollution of Cd and Zn in Nanfei inflow river area.
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Received: 10 September 2014
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CHEN Huan-Yu, LIU Jing-Qing, WEI Zong-Yuan, ZHANG Hui-Hui, HE Xiao-Fang, ZHOU Xiao-Yan, QIU Shang-De, HU Bao-Lan, LOU Li-Ping. Radial differences in contaminant distribution in large-diameter pipe scales of main pipelines in drinking water distribution system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(9): 2706-2712. |
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