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Arsenic (As) is a natural and ubiquitous element present in many environmental biotopes and it is released through various natural processes and anthropogenic activities.Arsenic is a very toxic, carcinogenic, clastogenic and teratogenic metalloid and chronic exposure to even low levels of arsenic results in arsenicosis.However, microorganisms have evolved multiple mechanisms for arsenic detoxification for long-term arsenic exposure.Purple non-sulfur bacteria have a richness of metabolic versatility and a strong biodegradability.