Arsenic is a ubiquitous element that ranks 20th in abundance in earth's crust. It is distributed throughout minerals, rocks, soil, sediment, water, air, living organisms and marine environment. Exposure to arsenic may come from natural source, industrial source, or administered acute poisoning. Arsenic is mobilized through a combination of natural processes such as weathering reactions, biological activity and volcanic emissions as well as through anthropogenic activities. Inorganic arsenic species have been considered as human carcinogens. Considerable concern exists globally about arsenic...