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Biodegradation of Eu(III)-citrate complexes by Pseudomonas fluorescens

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Summary

We have investigated the structure of Eu(III)-citrate complexes in aqueous solution and their degradability by Pseudomonas fluorescens. Analysis of 1:1, 1:2, and 1:5 Eu(III):citrate solutions at pH 7 by electrospray ionization mass spectrometry (ESI-MS) showed that the 2:2 Eu(III)-citrate complex is the predominant complex species at a low citrate/Eu(III) ratio, while at a high ratio, a 1:2 Eu(III)-citrate complex is formed preferably. Studies on the biodegradation of Eu(III)-citrate complex by P. fluorescens have shown that a 2:2 Eu(III)-citrate complex is resistent to degradation while a 1:2 complex transforms to a 2:2 complex with the degradation of excess citric acid.

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Authors and Affiliations

  1. Department of Materials, Physics, and Energy Engineering, Graduate School of Engineering, Nagoya University; Advanced Science Research Center, Japan Atomic Energy Research Institute, Furocho, Chikusa-ku, Nagoya, 464-8603, Japan; Tokai, Ibaraki 319-1195, Japan

    Y. Suzuki

  2. Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan

    T. Nankawa

  3. Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan

    T. Yoshida

  4. Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan

    T. Ozaki

  5. Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan

    T. Ohnuki

  6. Environmental Sciences Department, Brookhaven National Laboratory, Upton, New York 11973, USA

    A. J. Francis

  7. Department of Materials, Physics, and Energy Engineering, Graduate School of Engineering, Nagoya University, Furocho, Chikusa-ku, Nagoya, 464-8603, Japan

    S. Tsushima

  8. Ecotopia Science Institute, Nagoya University, Furocho, Chikusa-ku, Nagoya, 464-8603, Japan

    Y. Enokida

  9. Department of Materials, Physics, and Energy Engineering, Graduate School of Engineering, Nagoya University, Furocho, Chikusa-ku, Nagoya, 464-8603, Japan

    I. Yamamoto

Authors
  1. Y. Suzuki
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  2. T. Nankawa
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  3. T. Yoshida
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  4. T. Ozaki
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  5. T. Ohnuki
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  6. A. J. Francis
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  7. S. Tsushima
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  8. Y. Enokida
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  9. I. Yamamoto
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Suzuki, Y., Nankawa, T., Yoshida, T. et al. Biodegradation of Eu(III)-citrate complexes by Pseudomonas fluorescens. J Radioanal Nucl Chem 266, 199–204 (2005). https://doi.org/10.1007/s10967-005-0892-5

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  • DOI: https://doi.org/10.1007/s10967-005-0892-5

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