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《Journal of Anhui Agricultural Sciences》 2010-25
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Heavy Metal Pollution and Ecological Risk Assessment of Drainage Ditch Sediment in Lanzhou

AN Juan et al (Institute of Environmental Sciences,School of Earth and Environmental Sciences,Lanzhou University,Lanzhou,Gansu 730000)  
Through analyzing the content of heavy metal in surface drainage ditch sediments of Lanzhou,the article expounds the distribution features of these heavy metals;by comparing with the greatest content of heavy metals in sediments before the modern industrialization,the paper discusses the accumulation coefficient and potential ecological risk (PER) coefficients of these heavy metals,and then assess the ecological risk by adopting the method for evaluating PER index proposed by Lars Hakanson.The results indicate that the accumulating order for these heavy metals is:CdZnPb,and the order of pollution level is:CdPbZn.The analysis of comprehensive pollution index shows that the three drainage ditches of Lanzhou haven’t been highly polluted.
【Fund】: 国家自然科学基金项目(40773064)
【CateGory Index】: X52;X820.4
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