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| Effects of Organic and Inorganic Fertilizers on Heavy Metal Immobilization in Paddy Soil |
| Received:May 05, 2015 |
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| KeyWord:calcium magnesium phosphate fertilizer;silicon fertilizer;organic fertilizer;heavy metal immobilization;chemical form |
| Author Name | Affiliation | E-mail | | WU Wen-cheng | South China Institute of Environmental Sciences, MEP, Guangzhou 510655, China
College of Life Science, Sun Yat-Sen University, Guangzhou 510006, China | | | CHEN Xian-bin | South China Institute of Environmental Sciences, MEP, Guangzhou 510655, China | | | LIU Xiao-wen | South China Institute of Environmental Sciences, MEP, Guangzhou 510655, China | liuxiaowen@scies.org | | SONG Qing-mei | South China Institute of Environmental Sciences, MEP, Guangzhou 510655, China | | | LI Yun-biao | South China Institute of Environmental Sciences, MEP, Guangzhou 510655, China | | | CAI Xin-de | South China Institute of Environmental Sciences, MEP, Guangzhou 510655, China | |
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| Abstract: |
| Calcium magnesium phosphate fertilizer(CMPF), organic fertilizer(OF) and silicon fertilizer(SF) are common fertilizers and are considered as good immobilizers of heavy metals as well. In this study, a laboratory experiment was conducted to evaluate their immobilization efficiencies of heavy metals in a contaminated paddy soil by measuring soil pH and heavy metal forms in treated soil, so as to screen out the best immobilizer and its suitable dose. Results show that SF and CMPF significantly increased soil pH. Specifically, the soil pH was increased by 2.65 and 2.74 units by 4 g·kg-1 soil of SF and 8 g·kg-1 of CMPF, respectively. Adding OF at 8 g·kg-1 increased pH by 0.83 units, showing a lower capacity than applying two others. Three fertilizers showed significant effects on chemical forms of Cd, Cu, Pb and Zn, especially the exchangeable fraction. Adding 8 g·kg-1 CMPF decreased exchangeable fraction by 62.5%, 69.0%, 69.6% and 73.0% for Cd, Cu, Pb, and Zn, respectively, being transformed into the operational defined residual and organic fractions. Overall, the remediation efficiency of CMPF was better than that of SF and OF. The application rate would be 8 g·kg-1 CMPF for contaminated soil. |
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