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We investigated the association of europium(III) and curium(III) with the microorganisms  Chlorella vulgaris ,  Bacillus subtilis ,  Pseudomonas fluorescens ,  Halomonas  sp.,  Halobacterium salinarum , and  Halobacterium halobium  . We determined the kinetics and distribution coefficients ( K  d ) for Eu(III) and Cm(III) sorption at pH 3-5 by batch experiments, and evaluated the number of water molecules in the inner-sphere (N H₂O ) and the degree of strength of ligand field ( R  E/M ) for Eu(III) by time-resolved laser-induced fluorescence spectroscopy (TRLFS). Exudates from  C. vulgaris ,  Halomonas  sp., and  H. halobium  had an affinity for Eu(III) and Cm(III). The log  K  d  of Eu(III) and Cm(III) showed that their sorption was not fully due to the exchange with three protons on the functional groups on cell surfaces. The halophilic microorganisms ( Halomonas  sp.,  Halobacterium salinarum ,  H. halobium ) showed almost no pH dependence in log  K  d , indicating that an exchange with Na +  on the functional groups was involved in their sorption. The Δ N H₂O (=9-N H₂O ) for Eu(III) on  C. vulgaris  was 1-3, while that for the other microorganisms was over 3, demonstrating that the coordination of Eu(III) with  C. vulgaris  was predominantly an outer-spherical process. The  R  E/M  for Eu(III) on halophilic microorganisms was 2.5-5, while that for non-halophilic ones was 1-2.5. This finding suggests that the coordination environment of Eu(III) on the halophilic microorganisms is more complicated than that on the other three non-halophilic ones.

Sorption behavior of europium(III) and curium(III) on the cell surfaces of microorganisms