摘要
通过对云南个旧锡矿尾矿库土壤和作物中重金属含量分布特征的初步研究,结果表明尾矿库内作物的根际土壤中Pb、As和Cu含量严重超过国家土壤二级标准(GB15168-1995),污染指数分别为41-49、158-173和22-29,均属重度污染。生长在尾矿库内的作物也受到重金属的不同程度污染,马铃薯(Solanaceae Solanum Tuberosum)和豌豆(Pisum Sativum Linn)的食用部分Pb、As和Cu的含量与国家食品卫生标准上限值相比,高达152和38.5倍、17.4和1.2倍、2和0.95倍。尽管土壤中Sn含量很高,但作物中Sn含量正常,表明Sn未通过土壤-作物系统而进入矿区食物链中。因此应根据尾矿库中土壤的重金属地球化学分布特征,对其进行针对性地修复,避免在尾矿库内种植作物以减少矿区重金属污染在食物链中的扩散。
According to the primary study on the heavy metal contamination in soil and crops including potato and pea in tin tailings in Gejiu area in Yunnan Province, it has been found that contents of Pb, As and Cu in rhizosphere far exceed Chinese National Grade Ⅱ standard of soil environmental quality of China （GB 15618-1995）. The concentrations of Pb, As and Cu, which all reach to high-grade contamination, are 41-49, 158-173 and 22-29 respectively. It also has been found that ： the crops was living in the tin tailings suffered from the contamination of heavy metals. Compared with the limit of national criteria for food sanitation in China, the concentrations of Pb, As and Cu in edible parts of potatos and peas are 152 and 38.5 times, 17.4 and 1.2 times, 2 and 0.95 times. The fact that the concentration of Sn in the soils is high, but the concentration of Sn in crops is normal showed that Sn did not enter into food chain of the mining area through the soil-crop system. Therefore, the remediation of soil based on geochemical distribution characteristics of heavy metal in the tailings is demanded. And avoiding crops-planting in the tailings to reduce the diffusion of heavy metal contamination in food chain of mining area is necessary.
出处
《生态环境》
CSCD
北大核心
2008年第5期1847-1852,共6页
Ecology and Environmnet
基金
国家危机矿山接替资源勘查专项基金项目(200453003)
关键词
锡尾矿
重金属污染
土壤
马铃薯
豌豆
tin tailings
heavy metal contamination
soil
potato
pea
