Skip to main content
SpringerLink
Log in

U(VI) mono-hydroxo humate complexation

  • Published:
Journal of Radioanalytical and Nuclear Chemistry Aims and scope Submit manuscript

Abstract

The complexation of the uranyl ion with humic acid is investigated. The humic acid ligand concentration is described as the concentration of reactive humic acid molecules based on the number of humic acid molecules, taking protonation of functional groups into account. Excess amounts of U(VI) are used and the concentration of the humic acid complex is determined by the solubility enhancement over the solid phase. pH is varied between 7.5 to 7.9 in 0.1M NaClO4 under normal atmosphere and room temperature. The solubility of U(VI) in absence of humic acid is determined over amorphous solid phase between pH 4.45 and 8.62. With humic acid, only a limited range of data can be used for the determination of the complexation constant because of flocculation or sorption of the humic acid upon progressive complexation. Analysis of the complex formation dependency with pH shows that the dominant uranyl species in the concerned pH range are UO2(OH)+ and (UO2)3(OH)5 +. The complexation constant is evaluated for the humate interaction with the to UO2(OH)+ ion. The stability constant is found to be logβ = 6.94±0.3 l/mol. The humate complexation constant of the uranyl mono-hydroxo species thus is significantly higher than that of the nonhydrolyzed uranyl ion (6.2 l/mol). Published data on the Cm3+, CmOH2+ and Cm(OH)2 + humate complexation are reevaluated by the present approach. The higher stability of the hydrolysis complex is also found for Cm(III) humate complexation.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. J. I. Kim, Mat. Res. Soc. Symp. Proc., 294 (1993) 3.

    CAS  Google Scholar 

  2. P. Panak, R. Klenze, J. I. Kim, Radiochim. Acta, 74 (1996) 141.

    CAS  Google Scholar 

  3. V. Moulin, J. Tits, G. Ouzounian, Radiochim. Acta, 58/59 (1992) 179.

    Google Scholar 

  4. K. R. Czerwinski, G. Buckau, F. Scherbaum, J. I. Kim, Radiochim. Acta, 65 (1994) 111.

    CAS  Google Scholar 

  5. S. Sachs, V. Brendler, G. Geipel, Radiochim. Acta, submitted.

  6. M. A. Denecke, S. Pompe, T. Reich, H. Moll, M. Bubner, K. H. Heise, R. Nicolai, H. Nitsche, Radiochim. Acta, 79 (1997) 151.

    CAS  Google Scholar 

  7. S. Pompe, M. Bubner, M. A. Denecke, T. Reich, A. Brachmann, G. Geipel, R. Nicolai, K. H. Heise, H. Nitsche, Radiochim. Acta, 74 (1996) 135.

    CAS  Google Scholar 

  8. N. D. Bryan, N. Hesketh, R. F. Livens, E. Tipping, N. M. Jones, J. Chem. Soc. Faraday Trans., 94 (1998) 95.

    Article  CAS  Google Scholar 

  9. L. Rao, G. R. Choppin, Radiochim. Acta, 69 (1995) 87.

    CAS  Google Scholar 

  10. M. Mlakar, Anal. Chim. Acta, 276 (1993) 367.

    Article  CAS  Google Scholar 

  11. P. Warwick, A. Hall, D. Read, Radiochim. Acta, 66/67 (1994) 133.

    CAS  Google Scholar 

  12. E. Tipping, Radiochim. Acta, 62 (1993) 141.

    CAS  Google Scholar 

  13. A. Liu, R. D. Gonalez, Langmuir, 16 (2000) 3902.

    Article  CAS  Google Scholar 

  14. J. I. Kim, K. R. Czerwinski, Radiochim. Acta, 73 (1996) 5.

    CAS  Google Scholar 

  15. I. Pashalidis, K. R. Czewrinski, T. Fanghanel, J. I. Kim, Radiochim. Acta, 76 (1997) 55.

    CAS  Google Scholar 

  16. W. Runde, G. Meinrath, J. I. Kim, Radiochim. Acta, 58–9 (1992) 93.

    Google Scholar 

  17. V. Neck, W. Runde, J. I. Kim, B. Kanellakopoulos, Radiochim. Acta, 65 (1994) 29.

    CAS  Google Scholar 

  18. G. Buckau, Approach for Physico-Chemical Interpretation of An(III) and An(VI) Humate complexation, Annex 3, in: Humic Substances in Performance Assessment of Nuclear Waste Disposal: Actinide and Iodine Migration in the Far-Field (Second Technical Progress Report), G. Buckau (Ed.), Report FZKA 6969, Research Center Karlsruhe, 2004, ISSN 0947-8620.

  19. J. I. Kim, G. Buckau, G. H. Li, H. Duschner, N. Psarros, Fresenius J. Anal. Chem., 338 (1990) 245.

    Article  CAS  Google Scholar 

  20. S. B. Savvin, Talanta, 8 (1961) 673.

    Article  CAS  Google Scholar 

  21. P. Reiller, Prognosticating the humic complexation for redox sensitive actinides through analogy, using the charge neutralization model, Annex 11, in: Humic Substances in Performance Assessment of Nuclear Waste Disposal: Actinide and Iodine Migration in the Far-Field (Second Technical Progress Report), G. Buckau (Ed.), Report FZKA 6969, Research Center Karlsruhe, 2004, ISSN 0947-8620.

  22. NEA-TDB, Update on the Chemical Thermodynamics of Uranium, Neptunium, Plutonium, Americium and Technetium, Vol. 5, Thermochemical database of the OECD-NEA (Organization of Economic Co-operation and Development — Nuclear Energy Agency), 2003.

  23. G. Meinrath, Y. Kato, T. Kimura, Z. Yoshoda, Radiochim. Acta, 75 (1996) 159.

    CAS  Google Scholar 

  24. Y. Kato, T. Kimura, Z. Yoshida, N. Nitani, Radiochim. Acta, 74 (1996) 21.

    CAS  Google Scholar 

  25. J. I. Kim, G. Buckau, E. Bryant, R. Klenze, Radiochim. Acta, 48 (1989) 135.

    CAS  Google Scholar 

  26. A. Morgenstern, R. Klenze, J. I. Kim, Radiochim. Acta, 88 (2000) 7.

    Article  CAS  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. University of Cyprus, P.O. Box 20537, 1678, Nicosia, Cyprus

    I. Pashalidis

  2. Institut für Nakleare Entsorgung, Forschungszentrum Karlsruhe, P.O.Box 3640, 76021, Karlsruhe, Germany

    G. Buckau

Authors
  1. I. Pashalidis
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. G. Buckau
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Pashalidis, I., Buckau, G. U(VI) mono-hydroxo humate complexation. J Radioanal Nucl Chem 273, 315–322 (2007). https://doi.org/10.1007/s10967-007-6860-5

Download citation

  • Received:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10967-007-6860-5

Keywords

Search

Navigation