应用地积累指数法和富集因子法对铜矿区土壤重金属污染的安全评价

Application of Index of Geo-accumulation and Enrichment Factor in Safety Assessment of Heavy-metal Contamination in Soil of Copper Refining

采用地积累指数法和富集因子法对炼铜厂区土壤重金属污染进行评价,结果表明:两种方法均能对人为污染行为做出较为科学的评价,且两种方法可得到相似的评价结果。评价中采用地球化学背景值和浙江省土壤背景值对土壤重金属污染程度进行对比分析,发现两种背景值对土壤重金属的污染程度在分级上没有明显差异。土壤中Cd,Cu,Pb,Zn重金属元素显著富集,人类活动的影响比较明显,而Cr,Ni元素均处于零级别污染。厂区周围土壤受冶炼活动的影响,一些易于富集的重金属长期累积,其污染程度比远离厂区的未污染区域高出几十倍。

Assessment of heavy-metal contamination in soil of copper refining was conducted respectively by the method of index of geo-accumulation and enrichment factor. The result revealed that both methods could make a scientific assessment of contamination caused by human and could gain similar assessing conclusion. During the assessment, a contrast analysis of beavy-metal contamination level is performed by respectively adopting the value of geo-chemistry background and the value of soil background of Zhejiang province; it showed that there was no distinct difference in grading between the two values. Content of element Cd, Cu, Pb, and Zn was Oseriously increased due to human＇s activities, but content of element Cr and Ni ranked in zero-level. Contamination level of some elements in the region of copper refining was several decuple times higher than that of far away from copper refining.