文章研究以纳米羟基磷灰石为修复材料,采用人工模拟污染土壤的方法,借助Tessier五步法分析土壤中镉、铅的形态,研究了纳米羟基磷灰石对镉、铅污染土壤的修复效果,研究结果表明:n-HAP对土壤中有效态镉有一定程度的吸附钝化作用;n-HAP的投加比例为5%时,对Cd污染土壤的修复效果最好,Cd的有效态下降比率达到了49%;n-HAP对人工模拟污染土壤中有效态铅的钝化效果比较明显,对有效态铅的降低率达到了90%的水平,且平衡时间越长,修复效果越好;n-HAP对铅污染土壤的修复效果要好于镉污染的。
Forms of lead and cadmium were analyzed with five-step Tessier extraction method by adding different proportions of nano-hydroxyapatite(n-HAP) and taking artificial soil pollution means.Assessment of remediation of soil heavy metals with n-HAP was studied by bioavailability.Results showed that n-HAP had a certain degree of adsorption and inactivation effect on cadmium.When 5g of n-HAP was added into 100g soil sample,the effect of remediation was best,with removal rate of n-HAP to the available state of heavy metal up to 49%.The inactivation of n-HAP on active forms of lead was relatively effective,the decreased rate reached the level of 90% and the longer balance the better result.n-HAP had a better remediation effect on lead contaminated soil than the cadmium contaminated soil.