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

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...

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Bibliographic Details
Published in:Environmental pollution (1987) 2015-04, Vol.199, p.95-101
Main Authors: Liu, Chuanping, Yu, Huan-Yun, Liu, Chengshuai, Li, Fangbai, Xu, Xianghua, Wang, Qi
Format: Article
Language:English
Subjects:
Amorphous Fe oxide-bound As
Arsenic
Arsenic - analysis
Arsenic - chemistry
Arsenic - metabolism
As fractions
Asia
Availability
Bioavailability
Correlation
Cycles
Environmental Monitoring
Ferric Compounds - chemistry
Iron fractions
Iron oxides
Iron redox cycling
Mining
Oryza - chemistry
Oryza - metabolism
Paddy soil
Soil - chemistry
Soil Pollutants - analysis
Soil Pollutants - chemistry
Soil Pollutants - metabolism
Soils
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Summary: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. •Fe redox cycling can affect As fractionation and thus As bioavailability in soil.•Amorphous Fe oxide-bound As acts a sink of As.•Fe is of great significance in controlling As mobility and availability to rice. The effects of Fe redox cycling on As fractionation in the soil and As bioavailability to rice were investigated.
ISSN:0269-7491
1873-6424
DOI:10.1016/j.envpol.2015.01.025