Article Extraction of Pu3+, Pu4+ and PuO2+2 from Various Mineral Acid Solutions by Tri-n-butylphosphate and Di-(2-ethylhexyl)-orthophosphoric Acid was published on September 1, 1986 in the journal Radiochimica Acta (volume 40, issue 1).
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Gehmecker et al. (1986) studied this question.
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