Arsenic (As) contamination in groundwater as well as paddy field soil through irrigation is a major concern in Bangladesh and India. Understanding the leaching behavior of As in paddy field soil is important in evaluating the potential impact on food contamination. In a previous study (Azam et al., 2009) As leaching was investigated under natural conditions of rainfall (extracted with de-ionized water) and groundwater (extracted with synthetic groundwater) which resulted in significantly more As leaching in rainfall condition than groundwater condition from paddy field soil. As precipitation with calcium (Ca) and magnesium (Mg) played an important role in reducing As leaching in groundwater condition. A further study is needed to clarify underlying mechanisms that control As release. The objective of this study was to investigate the leaching behavior of As from highly contaminated paddy field soil under different conditions of Ca and Mg addition. Influence of phosphorus (P) on As release with and without addition of Ca and Mg were also studied.
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