Mercury is released into the natural environment via atmospheric pathways, from natural sources as volcanic emissions, biomass burning, oceans, vegetation, wetlands, and anthropogenic sources such as discharge of industrial waste by mining activities, combustion, use of pesticides, and burning of fossil fuels [5]. The amount of mercury mobilized and released into the environment undergoes a sequence of complex transformations and cycles between land, atmosphere, and ocean [5] at one of the three chemical forms of mercury: elemental mercury (Hg0), inorganic mercury (Hg22+ and Hg2+), and organic mercury (methylmercury — MeHg) [6] and [7]. Through this redistribution mercury accumulates in animal tissues and fishes and eventually is taken up by humans through the food chain. Concern over environmental pollution by Hg has intensified the search for analytical methods that require minimal sample preparation and provide good analytical sensitivity.