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| Immobilization of Soil Pb by Different Amendments |
| Received:June 02, 2015 |
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| KeyWord:lead;soil remediation;morphological analysis;immobilization;heavy metal |
| Author Name | Affiliation | E-mail | | CHEN Jie | State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China | | | ZHANG Jing | State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China | | | WANG Xin | State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China | | | SONG Jing-ke | State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China | | | WANG Xue-jiang | State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China | wangxj@tongji.edu.cn |
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| 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 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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