A STUDY OF THE CARBONATE COMPLEXATION OF CM-III AND EU-III BY TIME-RESOLVED LASER FLUORESCENCE SPECTROSCOPY

Carbonate complexation of Cm-III and Eu-III is studied by time-resolve d laser-induced fluorescence spectroscopy (TRLFS). The carbonate speci es M(CO3)(+), M(CO3)(2)(-) and M(CO3)(3)(3-) (M=Cm-III and Eu-III) are characterized by measuring excitation and emission spectra, and lifet ime. Stability constants for the first carbonate complex in 0.1 M NaCl O4, are found to be log beta(11) = 6.65+/-0.07 for Cm(CO3)(+) and log beta(11) = 6.57+/-0.08 for Eu(CO3)(+). The constant for Cm-III compare s well with the values for Am-III derived spectroscopically and by sol ubility measurement. No difference is found for the stability constant of Eu(CO3)(+) in the excited state as determined by TRLFS and in the ground state as determined by solubility measurement.