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| Influence of Modified Alum Powder on Extractability of Cadmium and Lead in Soils |
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| KeyWord:alum powder; cadmium; lead; stabilization; extractability |
| Author Name | Affiliation | | LI Ning-yu | Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | GUO Bin | Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | FU Qing-lin | Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | DING Yong-zhen | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | LI Hua | Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | DING Neng-fei | Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China |
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| Abstract: |
| Alum powder has fine size, large surface area and strong adsorption, and could be used to reduce heavy metal concentrations in soil solution. Here alum powder, hot acid alum powder, hot alkali alum powder and thiol modified alum powder were applied to cadmium（Cd） and lead（Pb） contaminated soils to assess their efficiency in immobilization of soil Cd and Pb. Application of all alum powder decreased extractability of Cd and Pb in soils. Extractable Cd and Pb were negatively correlated with the amounts of alum powder and incubation time. Hot alkali alum powder was the most effective in decreasing extractable Cd and Pb in soil. Scanning electron microscopy showed that hot alkali alum powder had smaller particle sizes and greater specific surface area than the original one did. The results of this study would be of practical importance in screening amendments for remediation of Cd and Pb contaminated soil. |
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