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M. Karbowiak, S. Hubert, B. Fourest, Christophe Moulin

Complex formation of uranium(VI) in periodate solutions

The uranyl/periodate system was investigated by Time-Resolved Laser-Induced Fluorescence Spectroscopy (TRLIFS), and Capillary Electrophoresis (CE) in 0.1 and 0.05 mol L^-1 perchloric solutions at pH 2.6, containing various amounts of periodate anions. The formation of only one complex, UO₂IO₄⁺, was observed for a periodate concentration ranging from 5×10^-5 to 10^-1 mol L^-1. The stability constant of this complex was estimated to be log β₁₁=1.8±0.2 by TRLIFS (fluorescence titration) and log β₁₁=2.0±0.2 by CE, for an ionic strength of 10^-1 and 5×10^-2 mol L^-1, respectively. Moreover, the 1:1 stoichiometrical ratio between uranium(VI) and periodate was confirmed by an analysis of the results obtained from the deconvolution of fluorescence spectra.

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 92, 08/2004
Pages: 489 - 494

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