INTRODUCTION
Arsenic(atomic number 33) is ubiquitous and rank 20th in
natural abundance, comprising about 0.00005% of the earth’s crust, 14th
in the seawater, and 12th in the human body(Mandal and Suzuki,
2002). Environmental form of arsenic is in two forms namely; organic and
inorganic. Organic species of arsenic are predominantly found in foodstuffs,
such as shellfish, as monomethly arsenic acid, dimethyl arsenic acid , and
arseno-sugars. Inorganic arsenic occurs in two oxidation states namely
arsenite(As 111) and arsenate(As v) (Ashoutosh,2005).
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