铁基材料对锑(Sb)污染土壤的稳定化效果研究

A Comparative Evaluation of Antimony(Sb) Immobilization in Contaminated Soil by Iron-based Materials

在实验室条件下研究了还原铁粉、硫酸亚铁、FeCl_3、针铁矿、水铁矿对污染土壤中Sb的稳定化效果。结果表明,当添加量为2%,养护时间为3 d时,各铁基材料对土壤中Sb的稳定化效果排序为FeCl_3>水铁矿>还原铁粉>硫酸亚铁>针铁矿。五种铁基材料对土壤中的Sb的稳定化效果随添加量与养护时间的增加而增加。通过Tessier连续提取法分析结果可知,铁基材料的加入有效降低了土壤中Sb的可交换态比例,显著地增加了铁锰结合态与残留态的比例。

The stabilization effect of five kinds of iron-based materials,including reduced iron powder,ferrous sulfate,ferric chloride,goethite and ferrihydrite,on Sb immobilization were investigated under laboratory conditions. The results showed that the stabilization efficiency of Sb increased with increasing iron-based materials amount. At 2% of materials addition,after immobilized for 3 days,the stabilization efficiency of such materials decreased as the following order： ferric chloride ferrihydrite reduced iron powder ferrous sulfate goethite. The results of Tessier sequential extraction procedures showed that the exchangeable fraction of Sb in soil decreased after materials application,and considerable increase in Sb was observed in the bound to Fe-Mn oxides fraction and residual fraction.