Wednesday, November 7, 2007
324-8

Total and Methy Mercury in Lake Ponchartrain Basin Sediment.

R. D. DeLaune, R. P. Gambrell, A. Jugsujinda, Aixin Hou, and Istvan Devai. Wetland Biogeochemistry Institute,School of the coast and Environment, Louisiana State University, 3171 Engy. Cst. &Env. Bldg., Baton Rouge, LA 70803

Concentration of total mercury and methyl mercury was determined in sediment at 293 sites along a salinity gradient in a Louisiana coastal estuary.Methyl mercury content of sediment was correlated to total mercury content of sediment ,organic matter and salinity.Methyl mercury content of sediment was positively correlated with total mercury,organic matter and clay content of sediment.Methylmercury was inversely correlated with salinity,sediment Eh and sand content Methyl mercury decreased with increase in salinity in the order of Lake Maurepas>Lake Pontchartrain>Lake Borgne/Chandeleur Sound.

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