CAJ | 학술논문

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。
통과향연오염토양중분별시가린산이경갑、탄산개화규산납삼충물료，측정료토양pH치、중금속연유효태함량적변화，평개료불동물료대연오염토양적둔화수복효과。운용개진적BCR법대연재토양중적형태분석，병대수복후적토양진행X사선연사（XRD）분석，탐토료불동물료적작용궤리。결과표명：삼충물료분별재5％、5％화2％（질량비）적투가비례하，대토양둔화수복효과최가；삼충물료균가여토양중연발생반응，분별생성Pb3（PO4）2、PbCO3화PbSiO3등함연광물침정，촉진토양중연적둔화；린산이경갑시가후，토양중유효태연함량감소95.7％，가교환태연함량감소96.1％，잔사태연함량증가4.7배，대토양수복적효과최가。
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.