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Distribution of Contents of Heavy Metals in Soil Profile Contaminated in Different Ways in Xiaoqinling Gold Mining Area
Author(s): XU Youning, ZHANG Jianghua, CHEN Shebin, KE Hailing
Pages: 200-
206
Year: 2008
Issue:
1
Journal: Agro-Environmental Protection
Keyword: soil profile; heavy metal pollution; Xiaoqinling gold mining area;
Abstract: The cropland soil in Xiaoqinling gold mining area was seriously polluted by heavy metals because of the mining industry. 5 typical soil profiles, farming type, atoms dust-fall type, river irrigation type, mining sewage irrigation type and tailings wastes eluviation type, were selected to study the distribution feature of heavy metals and their influencing depth and degree in vertical direction. The results showed that, among different types of polluted soil, the mining sewage irrigation type had the highest synthetic pollution degree of Hg, Pb, Cd, Cu and Zn, with the largest leaching and infiltration capability of heavy metals, the second was tailings wastes eluviation type. The pollution degree of Hg was the most serious in same pollution type. Within depth of 60 cm, the content of Hg was 10.778 mg·kg-1 in the sewage irrigation soil, 2.536 mg·kg-1 in the atoms dust-fall soil, 1.766 mg·kg-1 in river irrigation soil. But in all the profiles, the accumulated sub-standard depth of heavy metals was up to 60 cm. Therefore, the aim of restoring topsoil can not be achieved by merely ploughing soil deeply in the same place. These would provide scientific foundation for restoring topsoil pollution in mining area.
Citations
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