Determination of boron by (p, a) reaction |
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| Authors: | C S Sastri V Iyengar G Blondiaux T Sauvage Y Tessier |
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| Institution: | (1) Department of Materials Science, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki, 319-1195, Japan;(2) Skill Technos Co. Ltd, Isogo-ku, Yokohama, 235-0023, Japan;(3) Research Organization for Information Science and Technology, Tokai-mura, Ibaraki, 319-1195, Japan |
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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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