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Complexation of U(VI) with iodate ions: determination of stability constants by using spectroscopic methods and capillary zone electrophoresis

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Published/Copyright: September 25, 2009
Radiochimica Acta
From the journal Radiochimica Acta Volume 91 Issue 9

Summary

The uranyl iodate system has been studied by using three speciation methods: laser-induced time-resolved fluorescence spectroscopy (TRLIFS), UV-visible spectrophotometry and capillary zone electrophoresis with direct UV detection (CZE). Two uranyl iodate complexes were found: UO2IO3- and UO2(IO3)2 in 0.05M NaClO4 solutions of pH 2.6, depending on the iodate concentration. The three methods are convenient and efficient for determining the complex formation constants of the two complexes. The variation of the uranyl mobility as a function of the ligand concentration is very simple to analyse and its fitting leads to accurate thermodynamic data. The values obtained for log β11 (1.6±0.1) and log β12 (3.05±0.1) are in good agreement with the previously published values. Both complexes were also characterized by their fluorescence spectra and fluorescence lifetime. From the analysis of the fluorescence spectra, taking into account the dynamic quenching, the complex formation constants were calculated, in reasonable agreement with the ones obtained by capillary electrophoresis: log β11 (1.5±0.2) and log β12 (3.6±0.2).

Published Online: 2009-9-25
Published in Print: 2003-9-1

© 2003 Oldenbourg Wissenschaftsverlag GmbH

Articles in the same Issue

  1. Preparation of a stable tracer solution of plutonium(IV)
  2. Heterogeneous catalytic oxidation of neptunium(IV) in nitric acid solutions
  3. Complexation of U(VI) with iodate ions: determination of stability constants by using spectroscopic methods and capillary zone electrophoresis
  4. On the study of Th(IV)-humic acid interactions by competition sorption studies with silica and determination of global interaction constants
  5. Structural characterization of a ternary Fe(III)-U(VI)-citrate complex
  6. Investigation of sorption of Hg(II) ions onto coconut husk from aqueous solution using radiotracer technique
  7. Evaluation of novel getters for adsorption of radioiodine from groundwater and waste glass leachates
  8. Radiochemical neutron activation analysis for trace elements evaluation of human milk
  9. Preparation of 225Ac and 228Ac generators using a cryptomelane manganese dioxide sorbent
https://doi.org/10.1524/ract.91.9.505.20002

Articles in the same Issue

  1. Preparation of a stable tracer solution of plutonium(IV)
  2. Heterogeneous catalytic oxidation of neptunium(IV) in nitric acid solutions
  3. Complexation of U(VI) with iodate ions: determination of stability constants by using spectroscopic methods and capillary zone electrophoresis
  4. On the study of Th(IV)-humic acid interactions by competition sorption studies with silica and determination of global interaction constants
  5. Structural characterization of a ternary Fe(III)-U(VI)-citrate complex
  6. Investigation of sorption of Hg(II) ions onto coconut husk from aqueous solution using radiotracer technique
  7. Evaluation of novel getters for adsorption of radioiodine from groundwater and waste glass leachates
  8. Radiochemical neutron activation analysis for trace elements evaluation of human milk
  9. Preparation of 225Ac and 228Ac generators using a cryptomelane manganese dioxide sorbent
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