[Polluted characteristics of Zn, Pb, Cd, Cu and As in soil of different mining activity zones]

Depending upon the polluted features of various mining activities in a typical nonferrous metal mine, the contaminated soil area was divided into four zones which were polluted by tailings, mine drainage, dust deposition in wind and spreading minerals during vehicle transportation respectively. In each zone, soil samples were collected. Total 28 soil samples were dug and be analyzed by ICP-AES and other relevant methods. The results indicated that the average contents of Zn, Pb, Cd, Cu and As in soils were 508.6 mg x kg(-1), 384.8 mg x kg(-1), 7.53 mg x kg(-1), 356 mg x kg(-1) and 44.6 mg x kg(-1) respectively. But the contents of heavy metals in different zone have distinct differences. The pollution intension of tailing was the heaviest which Nemero index was 17.3. Ranking of pollution intension of different zones from heavy to light is in the sequence of tailing zone, mineral transportation zone, mine drainage zone, and dust deposition zone. The original phase of heavy metals and minerals is the main pollution ingredient of each zone. The proportion of oxidizing association with organic substance is small. Difference of the association of heavy metals is small in different polluted zones.