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．