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Investigations of actinides in the context of final disposal of high-level radioactive waste: trivalent actinides in aqueous solution

  • Nidhu L. Banik
  • Boris Brendebach
  • Christian M. Marquardt
Article

Abstract

The speciation of redox sensitive trivalent actinides Pu(III), Np(III), and U(III) has been studied in aqueous solution. The redox preparation, stabilization, and speciation of these trivalent actinides in aqueous systems are discussed here. The reductants investigated were rongalite, hydroxylamine hydrochloride, and acetohydroxamic acid and the An(III) species have been characterized by UV–Vis and XANES spectroscopy. The results show that the effectiveness of stabilization decreases generally in the order Pu(III) > Np(III) > U(III) and that the effectiveness of each reducing agent depends on the experimental conditions. More than 80 % of Pu(III) aquo species have been stabilized up to pH 5.5, whereas the Np(III) aquo ion could be stabilized in a pH range 0–2.5, and U(III) aquo ion is sufficiently stable at pH 1.0 and below over time periods suitable for experiments. However, this study gives a basis for the characterisation of the trivalent lighter actinides involved in complexation, sorption, and solid formation reactions in the future.

Keywords

Actinides Trivalent Redox Stabilization Spectroscopy 

Notes

Acknowledgments

This work was partly financed by The Federal Ministry of Economics and Technology (Germany) and the European Network of Excellence in Actinide Science (ACTINET).

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2014

Authors and Affiliations

  • Nidhu L. Banik
    • 1
  • Boris Brendebach
    • 1
  • Christian M. Marquardt
    • 1
  1. 1.Institute for Nuclear Waste Disposal (INE)Karlsruher Institute of Technology (KIT)Eggenstein-LeopoldshafenGermany

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