The priority trace elements arsenic and selenium werePriority trace elenients such as arsenic, selenium, cadmium, chromium, copper, lead, silver, and zinc are often present in the discharges from coal-fired electric power plants. These elements may be eliminated from the waste streams by coprecipitation with amorphous iron oxyhydroxide. Iron oxyhydroxide is formed when a ferric salt (e.g., ferric chloride) is added to the waste.
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