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 UO22+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.
Isabelle Billard, Eric Ansoborlo, Kathleen Apperson, Sylvie Arpigny, M. Emilia Azenha, David Birch, Pascal Bros, Hugh D. Burrows, Gregory Choppin, Laurent Couston, Veronique Dubois, Thomas Fanghänel, Gerhard Geipel, Solange Hubert, Jae I. Kim, Takaumi Kimura, Reinhardt Klenze, Andreas Kronenberg, Michael Kumke, Gerard Lagarde, Gerard Lamarque, Stefan Lis, Charles Madic, Gunther Meinrath, Christophe Moulin, Ryuji Nagaishi, David Parker, Gabriel Plancque, Franz Scherbaum, Eric Simoni, Sergei Sinkov, and Carole Viallesoubranne, "Aqueous Solutions of Uranium(VI) as Studied by Time-Resolved Emission Spectroscopy: A Round-Robin Test," Appl. Spectrosc. 57, 1027-1038 (2003)