Aqueous solutions of uranium(VI) as studied by time-resolved emission spectroscopy: a round-robin test |
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Authors: | Billard Isabelle Ansoborlo Eric Apperson Kathleen Arpigny Sylvie Azenha M Emilia Birch David Bros Pascal Burrows Hugh D Choppin Gregory Couston Laurent Dubois Veronique Fanghänel Thomas Geipel Gerhard Hubert Solange Kim Jae I Kimura Takaumi Klenze Reinhardt Kronenberg Andreas Kumke Michael Lagarde Gerard Lamarque Gerard Lis Stefan Madic Charles Meinrath Gunther Moulin Christophe Nagaishi Ryuji Parker David Plancque Gabriel Scherbaum Franz Simoni Eric Sinkov Sergei Viallesoubranne Carole |
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Affiliation: | Institut de Recherches Subatomiques, Chimie Nucléaire, CNRS/IN2P3 and University L. Pasteur, B. P. 28, 67037, Strasbourg Cedex 2, France. isabelle.billard@ires.in2p3.fr |
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Abstract: | Results of an inter-laboratory round-robin study of the application of time-resolved emission spectroscopy (TRES) to the speciation of uranium(VI) in aqueous media are presented. The round-robin study involved 13 independent laboratories, using various instrumentation and data analysis methods. Samples were prepared based on appropriate speciation diagrams and, in general, were found to be chemically stable for at least six months. Four different types of aqueous uranyl solutions were studied: (1) acidic medium where UO2(2+)aq is the single emitting species, (2) uranyl in the presence of fluoride ions, (3) uranyl in the presence of sulfate ions, and (4) uranyl in aqueous solutions at different pH, promoting the formation of hydrolyzed species. Results between the laboratories are compared in terms of the number of decay components, luminescence lifetimes, and spectral band positions. The successes and limitations of TRES in uranyl analysis and speciation in aqueous solutions are discussed. |
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