Arsenic speciation dynamics in paddy rice soil-water environment: sources, physico-chemical, and biological factors - a review
Article
Article Title | Arsenic speciation dynamics in paddy rice soil-water environment: sources, physico-chemical, and biological factors - a review |
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ERA Journal ID | 4694 |
Article Category | Article |
Authors | Kumarathilaka, Prasanna (Author), Seneweera, Saman (Author), Meharg, Andrew (Author) and Bundschuh, Jochen (Author) |
Journal Title | Water Research |
Journal Citation | 140, pp. 403-414 |
Number of Pages | 12 |
Year | 2018 |
Place of Publication | United Kingdom |
ISSN | 0043-1354 |
1879-2448 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.watres.2018.04.034 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0043135418303245 |
Abstract | Rice is the main staple carbohydrate source for billions of people worldwide. Natural geogenic and anthropogenic sources has led to high arsenic (As) concentrations in rice grains. This is because As is highly bioavailable to rice roots under conditions in which rice is cultivated. A multifaceted and interdisciplinary understanding, both of short-term and long-term effects, are required to identify spatial and temporal changes in As contamination levels in paddy soil-water systems. During flooding, soil pore waters are elevated in inorganic As compared to dryland cultivation systems, as anaerobism results in poorly mobile As(V), being reduced to highly mobile As(III). The formation of iron (Fe) plaque on roots, availability of metal (hydro)oxides (Fe and Mn), organic matter, clay mineralogy and competing ions and compounds (PO43− and Si(OH)4) are all known to influence As(V) and As(III) mobility in paddy soil-water environments. Microorganisms play a key role in As transformation through oxidation/reduction, and methylation/volatilization reactions, but transformation kinetics are poorly understood. Scientific-based optimization of all biogeochemical parameters may help to significantly reduce the bioavailability of inorganic As. |
Keywords | Irrigation water; Geogenic arsenic; Redox chemistry; Arsenic speciation; Metal (hydro)oxides; Arsenic accumulation |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 410404. Environmental management |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | School of Civil Engineering and Surveying |
Centre for Crop Health | |
Queen's University Belfast, United Kingdom | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q4y04/arsenic-speciation-dynamics-in-paddy-rice-soil-water-environment-sources-physico-chemical-and-biological-factors-a-review
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