Effect of Zero-Valent Iron Application on Cadmium Uptake in Rice Plants Grown in Cadmium-Contaminated Soils |
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Authors: | Toshihiro Watanabe Yasutoshi Murata Takashi Nakamura Yuki Sakai Mitsuru Osaki |
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Institution: | Research Faculty of Agriculture , Hokkaido University , Sapporo, Japan |
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Abstract: | Cadmium (Cd) contamination in soils is a serious problem for crop production in the world. Zero-valent iron Fe (0)] is a reactive material with reducing power capable of stabilizing toxic elements in a solution. In the present study, we examined the effect of zero-valent iron Fe (0)] application on Cd accumulation in rice plants growing in Cd-contaminated paddy soils. The application of 1.0 and 0.5 mg Fe (0) per 100 g soils significantly reduced the Cd concentration in seeds and leaves by less than 10% and 20% of those without Fe (0) application, respectively. The form of Cd in soil was determined by sequential extraction. The Fe (0) application increased the free-oxides-occluded (less available) Cd content, and decreased the exchangeable and iron-manganese-oxides-bound (more available) Cd content, in Cd-contaminated soils. Thus, this study clearly showed that the application of Fe (0) is a promising approach for remediation of Cd-contaminated paddy soils. |
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Keywords: | cadmium-contaminated soils Oryza sativa L reducing power sequential extraction method zero-valent iron |
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