Effects of Amendments and Water Conditions on the Chemical Speciation of Cd and Pb in Contaminated Paddy Soil in a Mining Area |
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| Authors: | Peng Zhang Liping Pan Weiwei Yang Chuanzhang Li Guiping Xu |
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| Affiliation: | 1. Guangdong Provincial Academy of Environmental Science, Guangzhou, Guangdong, P.R. China;2. Agricultural Resources and Environment Research Institute Guangxi Academy of Agricultural Sciences, Guangxi Nanning, P.R. China;3. School of Environment, Guangxi University, Nanning, Guangxi, P.R. China;4. Environmental Monitoring Station of Guangxi, Nanning, P.R. China |
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| Abstract: | Lime, sepiolite and peat were used as amendments to study their effects on the chemical speciation of Cd and Pb in a polluted paddy soil under moist and water-logged conditions. The results showed that application of amendments reduced acid-extractable Cd (up to 12.56% and 5.07%) and Pb (up to 6.69% and 2.68%) in moist and water-logged soils, respectively. The reducible Cd and residual Cd was increased while the oxidizable Cd was decreased after adding amendments. However, the oxidizable Pb was increased while the residual Pb was decreased in amended soil, and the reducible Pb presented a different changing trend under moist and water-logged conditions. The soil pH was significantly correlated with different fractions of Cd and Pb in soil, which indicated a distinct influence of soil pH on the redistribution process of Cd and Pb fractions in amended soil. |
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| Keywords: | amendments cadmium chemical speciation lead soil water |
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