| 陈杰,张晶,王鑫,宋靖珂,王学江.不同物料对污染土壤中铅的钝化[J].农业环境科学学报,2015,34(9):1674-1678. |
| 不同物料对污染土壤中铅的钝化 |
| Immobilization of Soil Pb by Different Amendments |
| 投稿时间：2015-06-02 |
| DOI：10.11654/jaes.2015.09.007 |
| 中文关键词: 铅 土壤修复 形态分析 钝化 重金属 |
| 英文关键词: lead soil remediation morphological analysis immobilization heavy metal |
| 基金项目:国家“863”计划项目“污泥土地利用风险控制综合技术研发与示范(2012AA063608-03)”;国家国际合作专项项目“污水厂污泥与餐厨垃圾高级厌氧消化技术及应用合作研究(2014DFA91650)” |
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| 中文摘要: |
| 通过向铅污染土壤中分别施加磷酸二氢钾、碳酸钙和硅酸钠三种物料,测定了土壤pH值、重金属铅有效态含量的变化,评价了不同物料对铅污染土壤的钝化修复效果。运用改进的BCR法对铅在土壤中的形态分析,并对修复后的土壤进行X射线衍射(XRD)分析,探讨了不同物料的作用机理。结果表明:三种物料分别在5%、5%和2%(质量比)的投加比例下,对土壤钝化修复效果最佳;三种物料均可与土壤中铅发生反应,分别生成Pb3(PO4)2、PbCO3 和PbSiO3等含铅矿物沉淀,促进土壤中铅的钝化;磷酸二氢钾施加后,土壤中有效态铅含量减少95.7%,可交换态铅含量减少96.1%,残渣态铅含量增加4.7倍,对土壤修复的效果最佳。 |
| 英文摘要: |
| In situ immobilization of heavy metals in polluted soil with immobilizing agents is a fast and effective approach to alleviating the environmental and healthy pressure resulted from soil pollution. Here we evaluated the effectiveness of three metal-immobilizers, namely potassium dihydrogen phosphate(KH2PO4), calcium carbonate(CaCO3) and sodium silicate(Na2SiO3), on soil Pb immobilization. After amendment of these immobilizing agents, soil pH, bioavailable Pb, and Pb fractions were measured, and the crystal structure of soil was also studied by X-ray diffraction technique. Chemicals KH2PO4, CaCO3 and Na2SiO3 performed the best in immobilization of Pb-polluted soil at a mass addition rate of 5%, 5% and 2%, respectively. Soil exchangeable Pb was decreased while residual Pb increased by three amendments. Lead precipitates Pb3(PO4)2, PbCO3, and PbSiO3 occurred in soil after adding immobilizers, resulting in the immobilization of Pb in soil. Compared with the control, the addition of KH2PO4 reduced bioavailable Pb and exchangeable Pb by 95.7% and 96.1%, respectively, but increased residual Pb by 4.7 times, showing that KH2PO4 possessed the best Pb-immobilizing performance among all three amendments. |
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