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《Resources and Environment in the Yangtze Basin》 2008-02
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POTENTIAL BIOLOGICAL TOXICITY ASSESSMENT ON HEAVY METAL POLLUTION IN SURFACE SEDIMENTS OF XUANWU LAKE

ZOU Li-min,WANG Chao,FENG Shi-long(The Environmental Science and Engineering College,Hohai University,Nanjing 210098,China)  
The contents of Zn,Cd and Ni in the sediment of Xuanwu Lake were measured with ICP-MS,and their potential biological toxicity was analyzed using sediment quality guidelines(SQGs)and geo-accumulation index.The contents of Zn,Cd and Ni in the sediments of Xuanwu Lake were 75.26~179.11,5.17~8.98 and 47.76~147.28 mg/kg,respectively,and the contents of Zn,Cd,Ni were respectively 1.08~2.91,51.70~89.80 and 1.33~4.11 times of the their background values in soil environment in Nanjing.These suggested that the pollution degree of Zn was slight in Xuanwu Lake while Cd and Ni were much serious,which may be affected by human activities significantly.The contents of heavy metals were not evenly distributed in sediments of Xuanwu Lake.The maximum mean and peak concentrations values of Cd and Ni were in the Southeast Lake(SE-L),indicating that it was polluted by heavy metals significantly.Similar results were also obtained through appraising the biological toxicity risk on the surface sediments in Xuanwu Lake using geo-accumulation index and biology database guideline.The potential biological toxicity risk in sequence was CdNiZn,and among these sampling points,SE-L had the highest potential risk on biological toxicity.
【Fund】: 国家(973)计划资助项目(2002CB412303);; 教育部科技研究重点项目(106088)
【CateGory Index】: X824
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