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


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

Moll, H.; Lütke, L.; Geissler, A.; Selenska-Pobell, S.; Bernhard, G.; Bachvarova, V.

Bacterial cell walls have great potential to influence the speciation and mobility of actinides and lanthanides in the environment. This study explores the unknown interaction between Cm(III)/Eu(III) and cell-suspensions of Sporomusa sp. MT-2.99, a novel isolate originating 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. It could be shown 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 immobilization within the cell envelope (minor).

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

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Publ.-Id: 18481