Qu, J; Ma, ZY; Cong, Q; Yuan, X; Wang, LL
The heavy metals pollution in vegetable soil around the transportation skeleton line in molybdenum ore areas was investigated. 180 soil samples were collected and treated with HNO sub(3)-HF-HClO sub(4), then the contents of Mo, Pb, As, Hg, Cr, Cd, Zn, Cu and Ni were determined by ICP-OES and assessed systematically, and the contents of heavy metals in underground water of vegetable field were also determined. Besides, forms of the heavy metals were analyzed. The results indicted that the soil belonged to polymetallic compound pollution in which Cd and Hg were the most serious pollutants. The pollution was the heaviest in vegetable soil that was 0 similar to 50 m apart from the transportation line, with Nemerow index 17.35. We found that the Nemerow index reduced with the increase of the distance. The forms of Cd, Cr, Cu, Ni and Zn in 0 similar to 50 m vegetable field showed: residual fraction>organic fraction>oxidizable fraction>acid extractable fraction, but for As, Hg, Mo and Pb, organic fraction>residual fraction>oxidizable fraction>acid extractable fraction. Forms of heavy metals in 50 similar to 100 m vegetable field were residual fraction>organic fraction>oxidizable fraction>acid extractable fraction, while, in 100 similar to 150 m vegetable field, the residual fraction>organic fraction>oxidizable fraction>acid extractable fraction. Oxidizable fraction of Hg and Cd was higher.