Subject(s): Water purification -- Arsenic removal -- Contamination of water -- Arsenic in groundwater and its health effects : Health hazards, social impact -- Hydrogeochemistry of arsenic contaminated water, arsenic removal processes and advantages of adsorption process, application of raw laterite as an arsenic adsorbent, application of acid-treated laterite as an arsenic adsorbent, application of acid base treated laterite as an arsenic absorbent