One effective method for removing arsenic from water is co-precipitation or adsorption onto iron oxyhydroxides. When iron is present in the water, or is added as a coagulant (like ferric chloride), iron precipitates are formed. Arsenic species (arsenite and arsenate) adsorb onto the surface of these precipitates or are incorporated into the growing iron particles. Subsequent sedimentation and filtration of these iron precipitates effectively remove arsenic from the water.
Arsenic present in groundwater can be partially removed
Asked in UPSC CAPF 2013 · Topic: Inorganic Chemistry (Chemistry of Main Group Elements (s-block and p-block))
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Answer: A. along with removal of iron by precipitation/ coagulation method if iron is also present in the water
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