新乡市自来水自备水源地土壤中重金属的形态研究

Forms of Heavy Metals in Soil Near Drinking Water Resource Sites of Xinxiang

用化学连续浸提法研究了新乡市自来水自备水源地土壤污染元素(Zn、Cr、Ni、Cu)的化学形态分布。结果表明,重金属Zn、Cr、Ni、Cu残渣态含量最高,所占比例为87.81%、78.38%、84.26%、59.33%,可交换态含量最低,所占比例为0.21%、2.56%、1.00%、3.51%。由于Zn、Cr、Ni、Cu主要以生物不可利用态为主,因此暂时不会造成地下水重金属污染,但存在潜在风险应及对其进行修复处理。

According to the sequential extraction, the chemical forms of heavy metals, Zn, Cr, Ni, and Cu in soil near drinking water resource sites of Xinxiang was investigated. The results showed that Zn, Cr, Ni and Cu were dominated by the residual fraction, and the average relative content of Zn, Cr, Ni and Cu was 87.81, 78.38, 84.26 and 59.33% respectively. The smallest proportion of Zn, Cr, Ni and Cu was exchangeable fraction and the relative content was 0.21, 2.56, 1.00 and 3.51% respectively. Although the Forms of the heavy-metals were not bioavailable and could not pollute the ground water, the potential pollution is possible.