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Microbial reduction of 99Tc (as TcO4 −) in anaerobic alkaline conditions

  • Session 1: Radionuclides in the Environment, Radioecology
  • Published:
Czechoslovak Journal of Physics Aims and scope

Abstract

The ability of bacteria to reduce pertechnetate in alkaline conditions was investigated using halophilic bacteria isolated from soda-lakes environments. Anaerobic halophilic bacteria were able to reduce as much as 0.25 mM pertechnetate, whereas no reduction took place without bacteria or in the presence of heat-killed bacteria. The results obtained showed reduction of Tc(VII)O4 − to the Tc(V) and Tc(IV) at pH 10 in the carbonate-bicarbonate medium. About 57% of the total technetium was determined to be Tc(IV), 1–3% as a Tc(V) and 17–20% as a Tc(VII) after 1–3 days of incubation with bacteria. The microbial reduction of Tc(VII) in alkaline conditions has been suggested as a potential mechanism for the removal of Tc from contaminated environments or waste streams.

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Author notes

  1. T. Khijniak

    Present address: Institute of Microbiology, Russian Academy of Sciences, 7/2 Prospect 60-letija Oktjabrja, 117312, Moscow, Russia

Authors and Affiliations

  1. Laboratoire de Chimie Nucleaire Analytique et Bioenvironnementale CNRS UMR 5084, Le Haut Vigneau, BP 120, 33175, Gradignan Cedex, France

    T. Khijniak, M. Simonoff, C. Sergeant & G. Simonoff

  2. Institute of Microbiology, Russian Academy of Sciences, 7/2 Prospect 60-letija Oktjabrja, 117312, Moscow, Russia

    N. N. Medvedeva-Lyalikova

Authors
  1. T. Khijniak
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  2. M. Simonoff
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  3. C. Sergeant
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  4. G. Simonoff
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  5. N. N. Medvedeva-Lyalikova
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Acknowledgements: Financial and human support from the French Ministry of Education and Research, CNRS, Bordeaux Region and from PACE (Programme sur l’Aval du Cycle Electronucléaire) is gratefully acknowledged.

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Khijniak, T., Simonoff, M., Sergeant, C. et al. Microbial reduction of 99Tc (as TcO4 −) in anaerobic alkaline conditions. Czech J Phys 53 (Suppl 1), A113–A117 (2003). https://doi.org/10.1007/s10582-003-0017-8

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  • DOI: https://doi.org/10.1007/s10582-003-0017-8

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