Abstract
The change in Kd values caused by the addition of oxalic acid to the system of bis(2-ethylhexyl)-orthophosphoric acid (HDEHP) and nitric acid is presented. The Kd values for zirconium and protactinium decreased noticeably after addition of small amounts of oxalic acid. On the other hand, the Kd values for uranium remained high. Uranium was recovered from the irradiated uranium solution by this nitricoxalic acid method. The uranium fraction contained much less -contaminants than that obtained by the usual HDEHP extraction. The decontamination factor for Zr/sup 95/ and Nb/sup 95/ became a thousand times higher than that of the usual HDEHP extraction. (auth)
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