ABSTRACT
Arsenic is one of the most toxic elements found in nature. Many sources of arsenic are geogenic (Smedley & Kinniburgh, 2001; Ahmed et al. 2004). In that case arsenic enrichment in environment occurs as a consequence of oxidation of sulfide minerals, reductive dissolution of ferric oxide and hydroxides with adsorbed arsenic, hydrothermal activities, and evaporation enrichment of arsenic dissolved in water (Welch et al. 2000). Recently, the safe limit for arsenic concentration in drinking water was set by WHO to 0.01 mg/L. This was a consequence of arsenic poisoning in the Bengal Delta Plain (BDP) in Bangladesh and West Bengal in India.
