摘要
采用污染指数法对冶炼厂周边的土壤及稻谷进行重金属（Zn、D、Cu、Pb、Cd和As）污染评价，结果显示冶炼厂周边土壤中除重金属铅、铬和砷外，其他重金属都超过了土壤环境质量标准，六种重金属平均综合污染指数达到2．89；对于稻谷样本中重金属含量，锌和铬含量满足评价标准要求，铜、铅、镉和砷含量超标，其超标倍数范围分别为4．68～6．35、5．45～36．75、0．05～1．5和1．59—5．67。说明冶炼厂周边土壤及稻谷已受到重金属不同程度上的污染。而重金属污染的相关性分析表明冶炼厂周边的土壤中存在多种重金属不同程度、不同组合的复合污染类型，农田生态系统存在复合污染的趋势。
Heavy metals such as Zn, Cr, Cu, Pb, Cd and As were assessed by pollution index method in soil and rice around a smeltery. The results indicated that the contents of Zn, Cu and Cd were over the environmental quality standard level, and the average synthesizing pollution index of all the six heavy metals reached 2.89; as to the samples of rice, the contents of Zn and Cr were under the standards, while the contents of Cu, Pb, Cd and As were higher than the standards level by times of 4. 68 - 6.35, 5.45 - 36.75, 0.05 - 1.5 and 1.59 - 5.67 respectively. All these showed that the soil and rice grew round the smeltery had been polluted in different levels by the heavy metals. A correlation analysis of heavy metal showed that there were different levels and combination types of heavy metal pollution in the soil around the smeltery, it meant a tendency of complex pollution for the ecosystem of the farmland.
出处
《四川环境》
2008年第5期19-23,共5页
Sichuan Environment
关键词
冶炼厂
土壤重金属
污染特性
评价
Smehery
heavy metals
pollution characteristics
assessment of pollution
