铅锌矿尾渣土壤中重金属的形态及潜在生态风险  

Forms of heavy metals in lead zinc ore tailings and its potential ecological risk

作　　者：彭晖冰[1] 刘云国[1] 李爱阳[2] 

机构地区：[1]湖南大学环境科学与工程学院,湖南长沙410082 [2]湖南工学院化学化工系,湖南衡阳421001

出　　处：《湖南农业大学学报（自然科学版）》2007年第3期345-347,共3页Journal of Hunan Agricultural University(Natural Sciences)

基　　金：国家"863"攻关项目(2001AA644020);湖南省自然科学基金项目(04JJ3013)

摘　　要：采用优化的BCR连续萃取方案对湖南永州铅锌矿尾渣土壤中Pb,Zn,Cu,Cd进行形态分析,并利用Lars Hakanson潜在生态危害指数法对4种重金属的生态危害进行了评价.结果表明:永州铅锌矿尾渣土壤中Pb,Zn,Cu,Cd等4种重金属的含量分别为6 884.1,2 948.31,547.85,105.88 mg/kg,达到严重污染程度,从高到低为:Cd,Pb,Cu,Zn.矿区土壤中的重金属易形成稳定的化合物或牢固存在于粘土矿物晶格中,酸溶解态或其他自由形式的金属含量低,不利于植物修复技术的实施,但可采用化学方法进行修复.Optimized BCR sequential extraction procedure was used to carry out morphological analysis of Pb, Zn, Cu and Cd in lead zinc ore tailing soils in Yongzhou city, South Hunan. Also Lars Hakanson＇s potential ecological risk index was applied to evaluate the ecological risk of heavy metals. As the results showed, each heavy metal content was big enough to reach a high pollution index, with a sequence as below： Cd, Pb, Cu, Zn. In addition, the heave metals were likely to form stable compounds or cling to the mineral crystal structure of clay with a low content of acid soluble form and metals of free state, which is no good for eluting of restoration of plants. But the four fractions of metal could be extracted efficiently by Chemistry method.

关 键 词：尾渣 重金属 形态 生态风险评价 

分 类 号：X53[环境科学与工程—环境工程]