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| Effects of Bagasse Application on Speciation and Bioavailability of Cadmium in Contaminated Soi |
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| KeyWord:bagasse; cadmium; bioavailability |
| Author Name | Affiliation | | SUN Wen-bo | School of Environmental Studies, Guangxi University | | MO Chuang-rong | School of Environmental Studies, Guangxi University | | AN Hong-xue | School of Environmental Studies, Guangxi University | | LIU Kan | School of Environmental Studies, Guangxi University | | CUI Wen | School of Environmental Studies, Guangxi University | | ZHANG Chao-lan | School of Environmental Studies, Guangxi University | | LI Xiao-ming | School of Environmental Studies, Guangxi University |
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| Abstract: |
| To investigate the effect of bagasse on speciation and bioavailability of Cd in agricultural soil, the unmodified and thiol-modified bagasse were used as soil ameliorants in pot experiments and soil culture experiments, and the surface of thiol-modified bagasse was further characterized by SEM and FTIR. The results showed that about 0.96% of thiol was grafted onto the bagasse fibers. No significant correlation was found between the chemical speciation of Cd and pH in the soil, but the concentration of humic acid（HA） and fulvic acid（FA） in soils was found to correlate with that of Cd: The concentration of HA in the soil decreased with the incubation time, and the exchangeable Cd decreased, while the residual Cd increased in the soil, and the chemically thiol-modified sugarcane bagasse was more effective than the unmodified one. In the pot experiment, Brassica Chinensis biomass was decreased significantly by the addition of Cd（5 mg·kg-1） compared with uncontaminated soil. The two amendments significantly improved biomass, and remarkably decreased Cd content in Brassica Chinensis and the content of DTPA extractable Cd in the Cd-contaminated soil, and the effect of thiol-modified bagasse was more remarkable than unmodified one. It was also found that the concentration of Cd in Brassica Chinensis has a significant negative correlation with the biomass, whereas it has a significant positive correlation with the content of DTPA extractable Cd. |
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