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Time-resolved laser fluorescence spectroscopy (TRLFS) is used to study Cm(III) solutions ([Cm] tot =2×10 −7  M) in 0.1−3.5 M CaCl 2  at pH c ≈11.7 and in three sets of experiments at constant ionic strength (1.0, 2.5 and 3.5 M CaCl 2 ) with pH c  varying from 10.8 to 11.9. The fluorescence spectra show Cm(III) emission bands in the range 605−620 nm. Increasing the CaCl 2  concentration strongly enhances the intensity of the observed bands. The concentration of aqueous Cm(III) species determined after 10 kD ultrafiltration increases as well, indicating that the Cm(III) hydroxide complexes are stabilized by a strong interaction with Ca 2+  ions. In 5 M NaCl-NaOH solutions studied for comparison, the curium is almost completely precipitated as Cm(OH) 3  colloids which show no fluorescence emission bands.

A TRLFS study of Cm(III) hydroxide complexes in alkaline CaCl 2 solutions