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Hydroponic and pot experiments were conducted to examine the effects of Fenton reagent on paddy rice plant growing in arsenic-contaminated soils. Fenton reagent significantly reduced arsenic phytotoxicity, uptake by the plants and accumulation in rice grain. This is attributed to oxidation of As3+ to As5+ by hydroxyl radicals and immobilization of arsenate by reacting with precipitating Fe3+ to form...