Doctor of Philosophy (PhD)
School of Plant, Environmental, and Soil Sciences
Arsenic (As) accumulation in rice (Oryza sativa) grains has increased human’s daily intake. Studies have shown that arsenite is taken up through known silicon (Si) transporters in rice. Moreover, the availability of As in soil is affected by chemically similar ligands that have high affinity to oxides surfaces, such as Si and phosphorus (P). Studies were conducted to: (I) investigate the role of elevated levels of Si on the concentration of different As fractions in soil and on As uptake by rice; (II) evaluate the effect of increasing monosilicic acidconcentrations on As sorption and kinetics in soil; and (III) evaluate the effect of increasing monosilicic acidconcentrations on P sorption and kinetics in soil. Arsenic content in rice grains was significantly reduced by Si fertilization in 2015 and 2016 (PP
Bastos Agostinho, Flávia, "Effect of Increasing Levels of Monosilicic Acid on Arsenic and Phosphorus Sorption in Soil" (2018). LSU Doctoral Dissertations. 4553.