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Bioaccumulation and biosorption characteristics of Mn 2+  ions by both dead and living, non-growing biomass of Gram-positive bacteria  Kocuria palustris  and  Micrococcus luteus  isolated from spent nuclear fuel pools were compared. The radioindicator method using radionuclide  54 Mn was applied to obtain precise and reliable data characterizing both processes as well as manganese distribution in bacterial cells. Manganese was mainly found on the surface (biosorption) of live cells of both bacteria and surface sorption capacity increased with Mn concentration in solution. Only 10.0% ( M. luteus ) and 6.3% ( K. palustris ) of uptaken Mn were localized in the cytoplasm (bioaccumulation). Biosorption of Mn by dead bacterial biomass was a rapid process strongly affected by solution pH. Maximum sorption capacities  Q  max  calculated from the Langmuir isotherm and characterizing Mn binding represented 316±15 μmol/g for  M. luteus  and 282±16 μmol/g for  K. palustris.  Results indicate that living, non-growing cells showed a higher efficiency of Mn removal than dead biomass. Based on FTIR spectra examination with aim to characterize the surface of  K. palustris  and  M. luteus  cells, we confirmed that the phosphate and carboxyl functional groups are involved in manganese sorption onto cell surface by both live and dead bacterial biomass.

Evaluation of Mn bioaccumulation and biosorption by bacteria isolated from spent nuclear fuel pools using 54 Mn as a radioindicator