Composition comprising cerium(IV) for removing arsenic from aqueous streams

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A composition, comprising : (a) an oxidizing agent comprising cerium having a cerium oxidation state of +4 to oxidize arsenic having a +3 oxidation state to arsenic having a +5 oxidation state; and (b) a rare earth-containing precipitating agent comprising a rare earth having a rare earth oxidation state of +3 to precipitate, from an aqueous solution, the arsenic in the +5 oxidation state.