Application of the fluorescence quenching titration method to the complexation of copper (II) in the Gironde Estuary (France) |
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Authors: | Pierrette Berger Marc Ewald David Liu James H Weber |
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Institution: | Groupe d''Océanographie Physicochimique, Laboratoire de Chimie Physique A, Université de Bordeaux I, 351 cours de la Libération, 33405 Talence Cedex France;Department of Chemistry, University of New Hampshire, Parsons Hall, Durham, NH 03824 U.S.A. |
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Abstract: | Quenching of fluorescence emission by the Cu2+ ion is measured in five samples from the Gironde Estuary (France). Non-linear regression analysis allows us to calculate from experimental data the values of CL (complexing capacities or total ligand concentrations), K (conditional stability constants) and IML (residual fluorescence at the end of the titration). The results obtained on the Gironde estuarine samples indicate that CL values are very low (<0.1 micromolar) and K values decrease from upstream to downstream. The relatively high values of IML are an indication that much of the organic fluorescing matter does not bind to Cu2+. |
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