湘南某铅锌矿区周围农业土壤中重金属污染及其潜在风险评价  

Heavy metals pollution and potential ecological risk in soils around Pb/Zn mine area in Hunan Province

作　　者：兰砥中 雷鸣[1] 周爽[1] 彭亮[1] 廖柏寒[2] 沈跃[3] 

机构地区：[1]湖南农业大学资源环境学院,长沙410128 [2]中南林业科技大学林学院,长沙410004 [3]农业部环境保护科研监测所,天津300191

出　　处：《环境化学》2014年第8期1307-1313,共7页Environmental Chemistry

基　　金：国家863项目子课题(2012AA101404-5);环保部公益基金(201009047);国家自然科学基金(21007014;B0702)资助

摘　　要：为了探究湘南某铅锌矿区尾砂坝垮坝之后,该区域周围的农业土壤中重金属污染情况,在该矿区周围采集农业土壤,分析土壤中Pb、Zn、Cu、Cd和As的含量,分别运用单因子指数和潜在生态风险指数评价土壤重金属的污染状况和潜在生态风险.结果表明,土壤中Pb、Zn、Cu、Cd、As的平均含量分别为566.82、285.90、69.00、10.29、670.12 mg·kg-1,该矿区周围的农业土壤仍旧受到不同程度重金属污染,其中Cd的污染指数最髙;所有农业土壤中Pb、Zn、Cu、Cd和As的潜在生态危害性顺序是Cd>As>Pb>Cu>Zn,其中Cd和As是主要的生态风险的贡献因子.该区域的农业土壤受到重金属污染程度并没有随着时间而有所减轻.To investigate the soil pollution by heavy metals after the collapse of the tailing dam, the concentrations of Pb, Zn, Cu, Cd, As in agricultural soils collected from a Pb/Zn mine area in south Hunan province were determined, and the single method index and Hakanson′s ecological risk index were employed. The results indicated that the average concentrations of Pb, Zn, Cu, Cd, As in soils were 566. 82, 285. 90, 69. 00, 10. 29, 670？12 mg·kg-1 , respectively. The single method index demonstrated that those agricultural soils were polluted seriously by heavy metals, especially Cd. The order of potential ecological risk for heavy metals was Cd＆gt;As＆gt;Pb＆gt;Cu＆gt;Zn, while Cd and As were the dominant contributors for ecological risk. The present study demonstrated that the agricultural soils still were contaminated by heavy metals after more than 20 years.

关 键 词：铅锌矿区 农业土壤 重金属 潜在风险评价 湘南 

分 类 号：X53[环境科学与工程—环境工程]