Process for removing arsenic from aqueous streams

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A composition is disclosed comprising an oxidising agent comprising cerium which has a cerium oxidation state of+4. The cerium oxidises arsenic which has a +3 oxidation state to arsenic having a +5 oxidation state. The composition also comprises a rare earthcontaining 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.