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Geomicrobiology Journal

Interactions of the Mont Terri Opalinus Clay isolate Sporomusa sp. MT-2.99 with curium(III) and europium(III)

Henry Moll Laura Lütke, Velina Bachvarova, Andrea Cherkouk, Sonja Selenska-Pobell and Gert Bernhard

Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf e.V., P.O. Box 510119, 01314 Dresden, Germany.


Bacterial cell walls have great potential to influence the speciation and mobility of actinides and lanthanides in the environment. In this study we explored the unknown interaction between Cm(III)/Eu(III) and cell-suspensions of Sporomusa sp. MT-2.99, a novel isolate recovered from Opalinus Clay (Mont Terri, Switzerland).

The Cm(III)/Eu(III) binding by the cell surface functional groups was studied by potentiometry combined with time-resolved laser-induced fluorescence spectroscopy (TRLFS). This paper provides stability constants of Cm(III)/Eu(III) complexed by cell surface functional groups. We could show that as a function of pH Cm(III)/Eu(III) binding occurred to hydrogen phosphoryl, carboxyl and deprotonated phosphoryl sites. Both metals showed a similar interaction process consisting of surface complexation (major) with high thermodynamic stability and an irreversible binding within the cell envelope (minor).

Keywords: curium, europium, Sporomusa sp, bacteria, TRLFS, potentiometry, complexation



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