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Interaction of UO22+ with sodium dodecyl sulfonate micelles based on fluorescence data

  • P. Repossi
  • W. A. Massad
  • G. A. Argüello
Article

Summary

The interaction between the U(VI) and a sodium dodecyl sulfonate (SDS) micelle was studied for intensity and emission lifetime. The measurements of the uranyl ion were done in a 1M H3PO4 medium. The self quenching rate constant (ksq) shows a larger value in micellar than in a SDS monomeric solution. This fact should be interpreted by micelles favoring the localized concentration of UO22+ species. Dynamic and static quenching was observed in the interaction between uranyl ion and the surfactant monomer before the induced critical micelle concentration (icmc) (1 mM) yielding a value of KD = (134±2) . 10M-1 and KS= (16±2) . 102M-1 for the dynamic and static quenching constant, respectively. A quantitative description of the binding was obtained by monitoring the emission lifetime of the uranyl excited state as a function of the surfactant concentration (titration curve), assuming that the observed lifetime is related to a weighted fraction of rate constants for the bound and unbound species.

Keywords

Surfactant Uranyl Critical Micelle Concentration H3PO4 Weighted Fraction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag/Akadémiai Kiadó 2005

Authors and Affiliations

  • P. Repossi
    • 1
  • W. A. Massad
    • 2
  • G. A. Argüello
    • 3
  1. 1.INFIQC - Departamento de Físico Química, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba
  2. 2.INFIQC - Departamento de Físico Química, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba
  3. 3.INFIQC - Departamento de Físico Química, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba

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