九华铜矿重金属环境污染状况研究

选择江苏九华铜矿区,对其周边土壤和作物的重金属污染状况进行了研究.结果发现,约有一半的采样点土壤全Cu含量超过我国土壤环境质量三级标准(400 mg/kg),其DTPA提取态Cu含量的平均值为117 mg/kg.通过对矿区土壤重金属间的相关分析表明,土壤Cu与Zn、Pb、Cd、Co之间呈极显著的正相关关系(p＜0.01),而与Cr、Ni无显著相关,说明了该铜矿区土壤还伴有外源Zn、Pb、Cd、Co的污染.土壤复合污染指数(PI)＞1.0的土壤样品占57.3%.矿区周围作物可食部位Cu、Zn、Pb、Cd和Cr的含量均较高.

Heavy Metal Pollution of the Environment in Jiuhua Copper Orefield

Copper is not only a nutrient element for plant growth, but also a pollutant in environment. Copper mining is one of the most important sources of soil Cu pollution. A study was carried out on environmental status of heavy metals in Jiuhua Cu Orefield, which is located east to Nanjing City, Jiangsu Province. Results showed that about half of the soil samples contained Cu well above the 3rd Grade Criteria of the Soil Environmental Quality Standard of China in concentration, and the mean vaule of DTPA extracted soil Cu was 117 mg/kg. Soil Cu is highly and positively correlated with soil Zn, Pb, Cd and Co (P<0.01), but not with Cr or Ni, suggesting that the soils in the region are also polluted by these metals. About 57.3% of the soil samples had comprehensive pollution index (PI) >1.0. A survey of crops in the mining area also showed that Cu, Zn, Pb, Cd and Cr concentrations in the edible parts of the crops were quite high.