Investigation and evaluation on heavy metal contamination in soils and groundwater of a mine zone
某矿区土壤和地下水重金属污染调查与评价

In order to know the situation of heavy metal contaminated soil and groundwater near the mine zone in south of Hunan Province. An investigation of heavy metal sources of this area was carried out. At the same time, we sampled soils and groundwater around the East River basin in this area and analyzed the contents of heavy metals in soils and groundwater. The results showed that there were eighteen main pollution sources around the mine zone of the East River basin, including metal choose factory, tailing pond, mining field and smelter, which released more heavy metals. The contents of Pb, Cd, Zn, As and Hg in most of the 20 sampling points exceeded those of the soil environmental quality standard in China (GB 15618-1995). All of integrated pollution index of soil samples exceeded 1(P > 1). Cd, As and Hg were the major elements of heavy metal pollution in soils of this mine zone. Highly significant positive linear relations were found between any two contents of Cd, Zn and As in soils. There was not obviously vertical migration of heavy metals in the soils and the groundwater of the 20 sampling points around this mine zone was not polluted by heavy metals. All of integrated pollution index of groundwater samples were far less than 1(P < < 1). The contents of Pb, Cd, Zn, As and Hg in the groundwater of all 20 sampling points were lower than those of the groundwater environmental quality standard in China(GB/T14848-9).