兰州某铝厂旧址周围土壤重金属污染及分布特征

研究了兰州某铝厂旧址周围土壤重金属形态特征,找出了该土壤中重金属元素的形态分布及变化规律,分析了引起7种重金属元素形态变化的主要因子。结果表明,该铝厂周围土壤重金属Cu、Mn、Ni、Pb、Zn、Cr、Cd污染严重。各重金属元素的含量随样品采集半径的增加而减少,7种重金属的形态分析结果表明,重金属污染主要以残渣态为主,Cd、Mn和Cr的弱酸态占有较大的比例,其中Cd的生态风险性最高。同时对重金属的环境效应和生态风险作出一定的评价,为治理和改善该地区土壤环境质量积累科学数据。

Pollution and distribution characteristics of heavy metals in soil around the former site of an aluminum plant in Lanzhou

The morphological characteristics of heavy metals in soil around the site of an aluminum factory in Lanzhou were studied, the distribution and variation of heavy metal elements in the soil were found out, and the main factors causing the morphological changes of seven heavy metal elements were analyzed. The results show that the heavy metals Cu, Mn, Ni, Pb, Zn, Cr and Cd in the soil around the aluminum factory are seriously polluted. The content of each heavy metal element decreases with the increase of sample collection radius. The morphological analysis results of the seven heavy metals show that the heavy metal pollution is mainly residual, and the weak acid states of Cd, Mn and Cr account for a large proportion, among which Cd has the highest ecological risk. At the same time, the environmental effects and ecological risks of heavy metals are evaluated to accumulate scientific data for the treatment and improvement of soil environmental quality in the region.