川南某稀土矿区土壤重金属污染现状评价

Assessment of Heavy Metal Contamination of Soils in a Rare Earth Element Mine in Southern Sichuan

为了揭示川南某稀土矿区土壤重金属污染现状,采用单因子污染指数法及内梅罗综合污染指数法对稀土矿山开采区土壤中的重金属污染现状进行了评价。结果表明:稀土开采对周边区域土壤污染严重,开采区及下游共70km河流两岸500m范围内耕作层及心土层土壤污染率均达100%,耕作层重度污染率达90%,心土层重度污染率达87%,主要污染物为Cd、Pb、Hg,污染程度依次为Cd>Hg>Pb。

In order to reveal the soil heavy metal pollution characters status of rare earth element mine in southern Sichuan,Single-factor pollution index and Nemerow pollution index method were used to reflect the situation of heavy metal pollution in the rare earth element mine.The results showed that soil pollution of rare earth element mining is serious.Within 500 meters of about 70 kilometers river including mining areas and downstream areas,100% of soil was polluted by heavy metal and there were 90% serious pollution in cultivated horizon and 87% serious pollution in subsoil.The principal pollutants included Cd, Pb and Hg,with pollution degree as Cd＆gt;Hg＆gt;Pb.