Organic MatterSolid Phase Interactions Are Critical for Predicting Arsenic Release and Plant Uptake in Bangladesh Paddy Soils

Agroecological zones within Bangladesh with low levels of arsenic in groundwater and soils produce rice that is high in arsenic with respect to other producing regions of the globe. Little is known about arsenic cycling in these soils and the labile fractions relevant for plant uptake when flooded....

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Bibliographic Details
Published in:Environmental science & technology 2011-07, Vol.45 (14), p.6080-6087
Main Authors: Williams, Paul N, Zhang, Hao, Davison, William, Meharg, Andrew A, Hossain, Mahmud, Norton, Gareth J, Brammer, Hugh, Islam, M. Rafiqul
Format: Article
Language:English
Subjects:
Agriculture
Analysis of Variance
Applied sciences
Arsenic
Arsenic - chemistry
Arsenic - pharmacokinetics
Arsenic content
Bangladesh
Biological and medical sciences
Biological and physicochemical properties of pollutants. Interaction in the soil
Biological Availability
Chromatography, High Pressure Liquid
Diffusion
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Environmental Measurements Methods
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Humic Substances - analysis
Hydrogen-Ion Concentration
Mass Spectrometry
Metals
Non agrochemicals pollutants
Oryza - metabolism
Oryza sativa
Phytopathology. Animal pests. Plant and forest protection
Pollution
Pollution effects and side effects of agrochemicals on crop plants and forest trees. Other anthropogenic factors
Pollution effects. Side effects of agrochemicals
Pollution, environment geology
Principal Component Analysis
Regression Analysis
Rice
Soil - analysis
Soil and sediments pollution
Soils
Solid solutions
Thin films
Water Movements
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Summary:Agroecological zones within Bangladesh with low levels of arsenic in groundwater and soils produce rice that is high in arsenic with respect to other producing regions of the globe. Little is known about arsenic cycling in these soils and the labile fractions relevant for plant uptake when flooded. Soil porewater dynamics of field soils (n = 39) were recreated under standardized laboratory conditions to investigate the mobility and interplay of arsenic, Fe, Si, C, and other elements, in relation to rice grain element composition, using the dynamic sampling technique diffusive gradients in thin films (DGT). Based on a simple model using only labile DGT measured arsenic and dissolved organic carbon (DOC), concentrations of arsenic in Aman (Monsoon season) rice grain were predicted reliably. DOC was the strongest determinant of arsenic solid-solution phase partitioning, while arsenic release to the soil porewater was shown to be decoupled from that of Fe. This study demonstrates the dual importance of organic matter (OM), in terms of enhancing arsenic release from soils, while reducing bioavailability by sequestering arsenic in solution.
ISSN:0013-936X
1520-5851
DOI:10.1021/es2003765