Uptake of Pu(IV) on Bio-Rex 63 from nitric acid medium: A kinetic study |
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Authors: | C. Janardanan P. V. Achuthan A. Ramanujam B. M. Misra |
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Affiliation: | (1) Process Development Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India;(2) Desalination Divison, Bhabha Atomic Research Centre, Trombay, Mumbai, India |
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Abstract: | Back-extraction of tri- and tetravalent actinides from diisodecylphosphoric acid (DIDPA) is studied using hydrazine carbonate as back-extractant. In experiments using 0.5M DIDPA–0.1M TBP n-dodecane solution, Am(III), Eu(III), Pu(IV) and Np(IV) are back-extracted, and the distribution ratios are decreased with an increase of hydrazine carbonate concentration. The back-extraction equilibria are confirmed by slope analysis in consideration of neutralization between DIDPA and hydrazine carbonate, which occurs quantitatively during back-extraction. In particular, oxidation of Np(IV) to Np(V) during back-extraction is observed by measuring absorption spectra. The hydrazinium ion acts as an oxidation reagent in the back-extraction of Np(IV). Separation factors of those metals are compared with the results of HDEHP. Hydrazine carbonate back-extracts Np(IV) more selectively from DIDPA than from HDEHP. |
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