A glove-box in contact with the lab atmosphere has been used in a test to see whether trivalent plutonium can be kept in this oxidation state at different pH. The box hosted a vessel of Pu(III) solution through which a hydrogen/argon gas mix was bubbled in the presence of a Pd/Pt catalyst. The results of solvent extractions and UV-Vis spectra for this system show that such conditions should not be considered sufficient to keep plutonium trivalent at a pH above two. The solvent extraction method was not found to affect the oxidation state composition of the samples.
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Mattias Olsson (2006) studied this question.
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