Investigations of actinides in the context of final disposal of high-level radioactive waste: trivalent actinides in aqueous solution
- 234 Downloads
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.
KeywordsActinides Trivalent Redox Stabilization Spectroscopy
This work was partly financed by The Federal Ministry of Economics and Technology (Germany) and the European Network of Excellence in Actinide Science (ACTINET).
- 1.OECD, NEA (1999) Status and assessment report on actinide and fission product partitioning and transmutation, ParisGoogle Scholar
- 3.Butler RJ, Sinkov S, Renshaw JC, Collison D, Livens FR, Taylor RJ, Choppin GR (2000) ATALANTE2000, October 24Google Scholar
- 5.Cohen D, Carnall WT (1960) J Inorg Nucl Chem 64:1933–1936Google Scholar
- 8.Gel’man AD, Mefod’eva MP (1958) Sov J Energy 4:361–364Google Scholar
- 17.Peretrukhin VF, Krot NN, Gel’man AD (1970) Sov Radiochem 12:81–84Google Scholar
- 18.Peretrukhin VF, Krot NN, Gel’man AD (1970) Sov Radiochem 12:85–88Google Scholar
- 20.Jun MJ, Zuming Z, Qizong Q (1991) Radioanal Nucl Chem 147:227–231Google Scholar
- 25.Geist A, Banik NL (2013) Private communicationGoogle Scholar
- 32.Budanov VV (2002) Russ J Coord Chem 28:294–300Google Scholar
- 33.Brendebach B, Banik NL, Marquardt CM, Denecke MA, Geckeis H (2009) Radiochim Acta 12:701–708Google Scholar