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A Study of U(VI) Hydrolysis and Carbonate Complexation by Time-Resolved Laser-Induced Fluorescence Spectroscopy (TRLFS)

Chemical species of U(VI) in 0.1 Μ Perchlorate solutions in equilibrium with 0.03% C02 partial pressure were investigated by time-resolved laser-induced fluorescence spectroscopy. The emission spectra of U(VI) solutions (pH = 3.8 to 7.0) in solidliquid equilibrium with schoepite U03 · 2H20 were interpreted by the summation of the emission spectra of the individual components, UO!(aq), (U02)2(0H)r(aq), (UO2)3(0H)i(aq) and U02C03(aq). Numerical evaluation of the emission spectra using the single component of the species gave a satisfactory agreement with the distribution of the species calculated from the formation constants of U(VI)-hydroxides and -carbonate complexes. Emission spectra of the higher carbonate species U02(C03)1" and U02(C03)^ could not be observed.