Arsenic Behavior in Paddy Fields during the Cycle of Flooded and Non-flooded Periods
Top Cited Papers
- 17 January 2004
- journal article
- research article
- Published by American Chemical Society (ACS) in Environmental Science & Technology
- Vol. 38 (4), 1038-1044
- https://doi.org/10.1021/es034383n
Abstract
The behavior of As in paddy fields is of great interest considering high As contents of groundwater in several Asian countries where rice is the main staple. We determined the concentrations of Fe, Mn, and As in soil, soil water, and groundwater samples collected at different depths down to 2 m in an experimental paddy field in Japan during the cycle of flooded and non-flooded periods. In addition, we measured the oxidation states of Fe, Mn, and As in situ in soil samples using X-ray absorption near-edge structure (XANES) and conducted sequential extraction of the soil samples. The results show that Fe (hydr)oxide hosts As in soil. Arsenic in irrigation waters is incorporated in Fe (hydr)oxide in soil during the non-flooded period, and the As is quickly released from soil to water during the flooded period because of reductive dissolution of the Fe (hydr)oxide phase and reduction of As from As(V) to As(III). The enhancement of As dissolution by the reduction of As is supported by high As/Fe ratios of soil water during the flooded period and our laboratory experiments where As(III) concentrations and As(III)/As(V) ratios in submerged soil were monitored. Our work, primarily based on data from an actual paddy field, suggests that rice plants are enriched in As because the rice grows in flooded paddy fields when mobile As(III) is released to soil water.Keywords
This publication has 31 references indexed in Scilit:
- A review of the source, behaviour and distribution of arsenic in natural watersApplied Geochemistry, 2002
- The Preparation and Preliminary Characterisation of Four New Geological Survey of Japan Geochemical Reference Materials: Soils, JSO‐1 and JSO‐2; and Marine Sediments, JMS‐1 and JMS‐2Geostandards Newsletter, 2002
- X-ray Absorption Fine-Structure Spectroscopy Study of Photocatalyzed, Heterogeneous As(III) Oxidation on Kaolin and AnataseEnvironmental Science & Technology, 1998
- Determining Manganese Oxidation State in Soils Using X‐ray Absorption Near‐Edge Structure (XANES) SpectroscopySoil Science Society of America Journal, 1995
- Sorption of arsenic by iron oxides and oxyhydroxides in soilsApplied Geochemistry, 1994
- Surface chemistry of ferrihydrite: Part 1. EXAFS studies of the geometry of coprecipitated and adsorbed arsenateGeochimica et Cosmochimica Acta, 1993
- Statistical Evaluation of Arsenic Adsorption Data Using Linear-Plateau Regression AnalysisSoil Science Society of America Journal, 1992
- Dynamics of iodine, bromine, and chlorine in soilSoil Science and Plant Nutrition, 1991
- Sequential extraction procedure for the speciation of particulate trace metalsAnalytical Chemistry, 1979
- Dissolution of Arsenic from Waterlogged and Aerated SoilSoil Science Society of America Journal, 1977