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

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

来源：Environmental Pollution, 2015, 199: 95-101.

DOI：10.1016/j.envpol.2015.01.025

• Iron redox cycling
• Paddy soil
• Amorphous Fe oxide-bound As
• Iron fractions
• As fractions

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.

• 出版日期2015-4
• 单位广东省生态环境技术研究所