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《Acta Scientiae Circumstantiae》 2007-02
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Heavy metal pollution of Wenyu River sediment and its risk assessment

LI Lianfang 1,2,3 , ZENG Xibai 1,2,* , LI Guoxue 3 , MEI Xurong 1,2 1. Institute of Environment and Sustainable Development for Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081 2. Key Laboratory of Agro-Environment & Climate Change, Ministry of Agriculture, Beijing 100081 3. College of Resources and Environment, China Agricultural University, Beijing 100094  
Heavy metals are often regarded as very important parameters reflecting sediment quality since river sediment is an essential component of water environment. In this paper, the characteristics of heavy metal enrichment in Wenyu River sediment were surveyed. The environmental risk assessment was conducted systematically using such methods as Sediment Enrichment Factors and H kanson potential ecological risk index, and the underlying source of heavy metals was analyzed. The results indicated that concentration ranges of Ni and Cd were 19.9~41.4 mg·kg -1 and 1.19~1.67 mg·kg -1 . According to Sediment Quality Guidelines, Wenyu River sediment was moderately contaminated by Cd and Ni since their concentrations were just between LE-L (Lowest effect level) and SE-L (Severe effect level) values, which may result in negative biota effects in the watersheds. Besides, toxic element arsenic concentration in sediment was very close to LE-L value and more emphasis should be placed on arsenic control in the next step. Using enrichment factor method, heavy metal enrichment was observed for more than 80% of the sampling points, and relatively high enrichment of toxic elements As and Cd was obtained. In terms of the correlation between Fe and heavy metals content in Wenyu River sediment, it was recognized that Zn, Cu and Cr mainly originated from natural sources while the content of Cd, As and Ni in Wenyu River sediment was mainly influenced by anthropogenic activities. Compared to soil background values of Beijing, the heavy metals in Wenyu River sediment showed very strong ecological risk, and the ecological risk of five heavy metals was in the descending order of Cd、As、Cu、Cr、Zn.
【Fund】: 国家“十五”科技攻关课题(No.2004BA516A19);; 北京市自然科学基金重大项目(No.8000001)~~
【CateGory Index】: X522
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