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PARTNERSHIP: Field management and post-harvest methods to mitigate toxic inorganic and organic arsenic species in rice grain


The overarching objective of this work is to understand how As species in rice grain are affected by water and soil management and post-harvest mitigation strategies. Specifically, we will examine how the concentration of As species, inclusive of DMMTA, in rice grain is affected by irrigation water management, soil S amendments, and parboiling. We will use a combined lab and field approach to address these objectives. We will evaluate As species, inclusive of DMMTA, in rice grain collected from a wide range of past field studies in Arkansas where water management had been manipulated but grain DMMTA was not measured (Aim 1); conduct new field experiments where we will examine the impact of water management on concentrations of As species in rice grain inclusive of DMMTA and concurrently test a soil As availability sensor for predicting and reducing As risk across variable soils and management in Arkansas (Aim 2); investigate the impact of soil S amendments on As speciation in rice grain in a pot study (Aim 3); and use grain from Aims 1-3 to investigate the role of parboiling and milling on concentrations of As species in rice grain, inclusive of DMMTA, to relate to human health risks (Aim 4).

Seyfferth, Angelia
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