Organo-arsenic Complexation Studies Explaining the Reduction of Uptake of Arsenic in Wheat Grown with Contaminated Irrigation Water and Organic Amendments

Application of organics in soil can reduce uptake arsenic (As) food crops grown on spiked with As. However, the results may be different if crop is As-contaminated irrigation water. In this study, a modest initiative has been undertaken to assess organo-arsenic equilibria using fulvic and humic extracted from paddy husk (PH), vermicompost (VC), soil. The acids were found polyprotic nature. Fulvic acid have highest mole ratio or combining ability 1.88 ± 0.59 stability constant (log K) 8.96 0.21. Based above findings, greenhouse experiment wheat was conducted concentrations As water (1, 2, 4, 8 mg L?1), irrigated 5 times throughout growth period 3 levels amendments (No amendment, VC PH @ 10 t ha?1 each). Paddy also effectively used as an amendment trim down bioavailability grain provided content < 2 L?1. Risk assessment soils carried out expressed hazard quotient per USEPA guideline. Solubility free ion activity model forecast transfer grain.