农业环境科学学报Issue(9)：1674-1678,5.DOI:10.11654/jaes.2015.09.007
不同物料对污染土壤中铅的钝化
Immobilization of Soil Pb by Different Amendments
摘要
Abstract
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 a-mendment 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.关键词
铅/土壤修复/形态分析/钝化/重金属Key words
lead/soil remediation/morphological analysis/immobilization/heavy metal分类
资源环境引用本文复制引用
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,(9):1674-1678,5.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 （）
