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Oxidation of arsenite [As(III)] with ozone and oxygen was investigated in groundwater samples containing 46-62 μg/l total dissolved arsenic, 100-1130 μg/l Fe and 9-16 μg/l Mn. Conversion of As(III), which constituted over 70% of dissolved arsenic in the samples, to As(V) was fast with ozone, but sluggish with pure oxygen and air. Iron and manganese in the samples were also oxidized and, by sequestering...
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