Arsenic availability in rice from a mining area: Is amorphous iron oxide-bound arsenic a source or sink?

文献类型： 外文期刊

第一作者： Liu, Chuanping

作者： Liu, Chuanping;Yu, Huan-Yun;Liu, Chengshuai;Lie, Fangbai;Xu, Xianghua;Wang, Qi

作者机构：

关键词： Iron redox cycling;Paddy soil;Amorphous Fe oxide-bound As;Iron fractions;As fractions

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

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年卷期：

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收录情况： SCI

摘要： The effect of iron (Fe) redox cycling on the mobility and bioavailability of arsenic (As) in paddy soils has attracted increasing concerns, especially in Asia, where the paddy soil is characteristic of Fe with high abundance and activity. However, whether amorphous Fe oxide-bound As acts as a source or a sink of As in natural field conditions needs to be clarified further. In this study, 73 pairs of soil and rice were collected from paddy fields contaminated by As-containing acid mining drainage. The most significant correlations between the iron fractions and As fractions suggest that Fe redox cycling can directly affect As fractionation in soils, which can then indirectly affect As bioavailability. Significantly negative correlations between amorphous Fe oxide-bound As in soil and As in rice grain were found, indicating that amorphous Fe oxide-bound As acts a sink of As. (C) 2015 Elsevier Ltd. All rights reserved.

分类号： X5

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