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A role of methanol on the enhancement of the sorption of M(III) [M=Eu, Cm] in HCl-CH 3 OH mixture/cation exchange resin system was investigated by comparing the distribution coefficient of M(III) with its coordination states both in the solution and the resin phases. The inner-sphere hydration number (N H2O ) of M(III),  i.e ., the number of water molecules in the first coordination sphere, was determined by the measurement of the luminescence lifetime of M(III) using Time-Resolved Laser-induced Fluorescence Spectroscopy. From the results showing a decrease of N H2O  with an increase of methanol mole fraction (X CH3OH ), it was found that the inner-sphere complexations of M(III) both with Cl -  in the solution phase and with exchange group, SO 3  - , in the resin phase were promoted with an increase of X CH3OH . The variation of the coordination environment around Eu(III) estimated from the emission spectra was correlated well with the variation of the N H2O . It was concluded that the increase of the sorption is mainly resulted from the inner-sphere complexation of M(III) with SO 3  -  in the resin phase.

radiochimica acta

Sorption behavior and coordination state of Eu(III) and Cm(III) in hydrochloric acid-methanol mixture/cation exchange resin system studied by time-resolved laser-induced fluorescence spectroscopy