The interaction of uranium(VI) with carbonate ions was studied with absorption spectroscopy and time-resolved laser-induced fluorescence spectroscopy due to the importance of these complexes in environmental relevant waters. In the pH range from 2 to 11 the influence of the temperature on the spectra was studied to check changes in the abundances of several binding forms. It was found that several binding forms are predominant at different temperatures and pH values. This observation can be explained by speciation changes due to the dependence of chemical equilibria on the temperature. Furthermore photoluminescence spectra of aqueous solutions of uranyl carbonate complexes were observed at ambient temperatures for the first time and single component absorption spectra of the uranyl carbonate complexes UO2(CO3)3 4− and UO2(CO3)2 2− were derived.
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The Authors thank Mrs. G. Grambole for preparing the uranium stock solutions from solid UO3, Mrs. C. Eckardt and Mrs. U. Schaefer for providing analytical data.
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Götz, C., Geipel, G. & Bernhard, G. The influence of the temperature on the carbonate complexation of uranium(VI): a spectroscopic study. J Radioanal Nucl Chem 287, 961–969 (2011). https://doi.org/10.1007/s10967-010-0854-4
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DOI: https://doi.org/10.1007/s10967-010-0854-4