Aquatic Sciences Meeting, Albuquerque 2001

PC09 River and Margin Biogeochemistry

Date: Wednesday, February 14, 2001

Location: Southwest Hall

Powell, R, T, LUMCON, Chauvin, USA, rpowell@lumcon.edu

Wilson-Finelli, A, , LUMCON, Chauvin, USA, afinelli@lumcon.edu

ORGANIC COMPLEXATION AND SPECIATION OF IRON IN THE MISSISSIPPI RIVER PLUME

In 2000 we participated in two cruises (high flow and low flow) to the Mississippi River plume as part of a team investigating the sources and fates of organic carbon. Daily stations (9 per cruise) were chosen to represent the typical water mass types of a river dominated coastal system: turbid (high particles, low salinity), highly productive (lower particulates, intermediate salinity) and oligotrophic (outside of the plume, high salinity). At each of these primary stations as well as 9 others per cruise, we have determined the concentration of organic Fe complexing ligands and their conditional stability constants using competitive ligand (2-(2-Thiazolylazo)-p-cresol) equilibration adsorptive cathodic stripping voltammetry. In order to elucidate their sources and fates, we will discuss the changes in ligand concentrations and conditional stability constants as they relate to changes in salinity, productivity, chlorophyll a, zooplankton grazing rates and turbidity.

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Aquatic Sciences Meeting, Albuquerque 2001

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