Arsenic is a toxic element found in groundwater and surface water. Exposure to arsenic can be injurious to health and therefore is regulated by the Safe Drinking Water Act. An effective method for removing Arsenic is through co-precipitation with metal based coagulants such as Ferric Sulfate. When metal salts hydrolyze they form positively charged sites that will attract and adsorb negatively charged Arsenate anions by surface complexation. The resulting complexes will precipitate out of the solution.

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