Iron oxidation-reduction bioavailability in and its impacts on cadmium paddy soils： a review

Redox conditions in paddy soils may vary as they are submerged and drained during rice growth. This change may bring about reductive dissolution of iron （Fe） oxides and subsequent formation of secondary Fe-bearing minerals in rice paddies. The mobility and bioavailability of metal contaminants such...

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Published in中国环境科学与工程前沿：英文版 Vol. 6; no. 4; pp. 509 - 517
Main Author Chunhua ZHANG Ying GE Huan YAO Xiao CHEN Minkun HU
Format Journal Article
LanguageEnglish
Published 2012
Subjects
含铁矿物
氧化还原条件
氧化还原过程
水稻土
生物利用度
稻田土壤
金属污染物
镉（Cd）
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Summary:Redox conditions in paddy soils may vary as they are submerged and drained during rice growth. This change may bring about reductive dissolution of iron （Fe） oxides and subsequent formation of secondary Fe-bearing minerals in rice paddies. The mobility and bioavailability of metal contaminants such as cadmium （Cd） in paddy soils are closely related to the chemical behaviors of Fe. Therefore, in this paper, advances in the study of paddy Fe redox transformations and their effects on Cd availability to rice are briefly reviewed. Current concepts presented in this review include the forms of Fe in paddy soils, the reactions involved in Fe oxidation-reduction, chemical factors affecting Fe redox processes, Cd availability to rice and the impacts of Fe transformation on Cd uptake and translocation in rice. Prospects for future research in this area are also discussed.
Bibliography:Redox conditions in paddy soils may vary as they are submerged and drained during rice growth. This change may bring about reductive dissolution of iron （Fe） oxides and subsequent formation of secondary Fe-bearing minerals in rice paddies. The mobility and bioavailability of metal contaminants such as cadmium （Cd） in paddy soils are closely related to the chemical behaviors of Fe. Therefore, in this paper, advances in the study of paddy Fe redox transformations and their effects on Cd availability to rice are briefly reviewed. Current concepts presented in this review include the forms of Fe in paddy soils, the reactions involved in Fe oxidation-reduction, chemical factors affecting Fe redox processes, Cd availability to rice and the impacts of Fe transformation on Cd uptake and translocation in rice. Prospects for future research in this area are also discussed.
paddy soil, redox, iron, cadmium, bioavail- ability, rice
10-1013/X
ISSN:2095-2201
2095-221X