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《》 2004-01
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Risk assessment of heavy metals contamination of soils around mining area

CAI Mei-fang, DANG Zhi, WEN Zhen, ZHOU Jian-min Department of Applied Chemistry, South China University of Technology, Guangzhou 510641, China  
Ecosystem has been badly contaminated by heavy metals near Dabaoshan mine, Guangdong province. To study its risk assessment, the total content and chemical forms of heavy metals in soil, plants and sediment near Dabaoshan mine were characterized in details by using two different approaches respectively, i.e., total content and sequential extraction. The levels of Pb, Zn, Cu and Cd in the sediment of Hengshi river with mine drainage afflux are found as high as 1841.02, 2326.28, 1522.61 and 10.33 mg/kg respectively, which are beyond their contents in the control samples. The paddy fields irrigated by Hengshi river have been found serious pollution of heavy metals too. The concentration of these four heavy elements is far beyond that recommended in soil standard (GB15618-1995). The results show that the plants have been seriously contaminated by heavy metals. And the ability of different plants to absorb and accumulate heavy metals was distinctly different. The sequential extraction results demonstrate that heavy metals were primarily in the residual fraction. However, the percents of heavy metals in Fe-Mn oxidation fraction and organic fraction are also high. It indicates serious contamination of toxic heavy metals in soils around this mine.
【Fund】: 国家自然科学基金项目(批准号为49873033);; 广东省环保局开发基金项目(2001-27)
【CateGory Index】: X825
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