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| Pollution status and risk assessment of heavy metal in the sediment of the severe polluted confluence area of Lake Chaohu |
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Abstract Ecological risk and accumulation of heavy metals in the sediment of the severe polluted confluence area of Lake Chaohu were studied in the present research. The results indicated that heavy metal accumulated mainly in the low-lying area which is about 700m away from the bank and which was influenced greatly by sediment distribution. Levels of heavy metal increased with the increase of sediment depth in surface sediment (0~2cm). Index of geoaccumulation and potential ecological risk index were used to evaluate extent of heavy metal pollution in the studied area. The results indicated most of the metals studied, except Hg (Eri=325.5) and Cd(Eri=240.28), had low ecological risk and they followed a descending order as: Hg>Cd>Zn>Pb>Cu>As>Cr>Ni. Among these metals studied, Hg and Cd ranked high and was classified into grade three and they might originate from the same sources. Seriously, the upper 0~14cm of sediment had presented very high ecological risk (RI>525) because of Hg and Cd. In addition, Hg in the 14~34cm of sediment still had presented moderate ecological risk. Therefore, emergent measures must be taken to control pollution of Hg and Cd in the area studied.
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Received: 31 July 2013
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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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