定南县废弃稀土矿区土壤中重金属元素Pb、Cr和Cu的测定

Determination of the Content of Heavy Metal Elements Pb,Cr and Cu in Soil from Abandoned Rare Earth Mine in Dingnan County

为了解废弃稀土矿土壤及周边土壤的重金属污染及对环境的影响,采用HNO3-HClO4湿法消解土壤样品,用原子吸收分光光度计及标准曲线法对消解样品中的重金属元素Pb、Cr、Cu含量进行了测定。根据国家土壤环境标准评价这3种重金属元素在该土壤中是否超标及超标程度。结果表明,赣州市定南县废弃稀土矿区及周边土壤中铅含量严重超标;矿区及周边土壤Cr含量未见超标;周边土壤铜含量接近超标。可见该废弃稀土矿区重金属元素污染以Pb为主,建议在土壤植物修复过程中着重考虑对Pb元素的清除。

The content of Pb, Cr and Cu in soil from abandoned rare earth mine and from the areas surrounding the mine in dingnan county was determinated, and the level of heavy - metal contamination of soil made by Pb, Cr and Cu was assessed based on relative national standards of China, the soil sample were processed by HNO3 - HC104 wet digesting method, Pb, Cr and Cu within digestion solution were determined by atomic absorption spectrophotometly and standard curve method. The results show that the content of Pb exceed the state maximum allowable limit in abandoned rare earth mine and in the areas surrounding the mine, the content of Cr is not out of state maximum allowable limit. The content of Cu is almost beyond the state maximum allowable limit in the areas surrounding the mine. It concluded the Pb is the major pollutant of heavy - metal contamination to soil from abandoned rare earth mine in dingnan county, and in the process of soil phytoremediation, the removal of Pb is the major job.