金属冶选尾矿库周边土壤重金属污染诊断

通过对某尾矿库周边15个取样点的土壤进行取样调查,根据国家土壤环境质量标准(GB 15618—1995),采用单项污染指数法、综合污染指数法对该区的土壤重金属(Cu、Zn、Cd、Pb)含量进行评价。结果表明:所有采样点的土壤重金属含量均未超过GB 15618—1995二级标准值,各金属污染程度为Zn>Cu>Cd>Pb;采样点土壤中Cu含量均未超过GB 15618—1995一级标准值,Pb在采样点GW-3、GW-5、GW-6、GW-7的含量超过了GB 15618—1995一级标准值,Zn在采样点GW-2、GW-8的含量也超过了GB 15618—1995一级标准值,Cd在采样点GW-5、GW-7的含量超过GB15618—1995一级标准值;尾矿库四周污染程度依次为:东侧>南侧>北侧>西侧。

DIAGNOSES ON THE HEAVY METAL POLLUTION IN THE SOIL SURROUNDING A TAILING RESERVOIR OF MINERAL PROCESSING AND METALLURGY

The paper evaluated soil pollution at 15 sites around a tailing reservoir of mineral processing and metallurgy． According to the state environmental quality standards for soils ( GB 15618—1995) ，single factor pollution index method and the composite pollution index method were disccussed． The analysis indicated that: The pollution levels for heavy metal of Cu， Zn，Cd，and Pb were below the second degree ( II) of the state standard at all sites; the severity order was Zn ＞ Cu ＞ Cd ＞ Pb; for individual metals，the pollution level for Cu was below the first degree ( I) of the state standard; Pb content exceeded the first degree ( I) of the state standard at the sites GW-3，GW-5，GW-6，and GW-7; Zn exceeded the first degree ( I) at the site GW-2，GW-8; Cd exceeded the first degree ( I) at the sites GW-5 and GW-7． The pollution levels around the reservoir was in the order as follows: East ＞ south ＞ north ＞ west．