Back-extraction of tri- and tetravalent actinides from di(2-ethylhexyl)phosphoric acid (HDEHP) with hydrazine carbonate
Creators
- 1. Japan Atomic Energy Research Inst., Dept. of Materials Science, Tokai-mura, Ibaraki (Japan)
- 2. Ishikawajima Harima Heavy Industry Co. Ltd., Isogo-ku, Yokohama (Japan)
Description
Back-extraction of tri- and tetravalent actinides from di(2-ethylhexyl)phosphoric acid (HDEHP) was studied using hydrazine carbonate as back-extractant. In experiments using 0.5 M HDEHP-0.2 M TBP n-dodecane solution, Am(III), Eu(III), Pu(IV) and Np(IV) were back-extracted, and the distribution ratios were decreased with an increase of hydrazine carbonate concentration. The back-extraction equilibria were confirmed by slope analysis in consideration of neutralization between HDEHP and hydrazine carbonate, which occurred quantitatively during the back-extraction. In particular, oxidation of Np(IV) to Np(V) during the back-extraction was observed by measuring absorption spectra. The hydrazinium ion acts as an oxidation reagent in the back-extraction of NP(IV). (orig.)
Additional details
Publishing Information
- Journal Title
- Radiochimica Acta
- Journal Volume
- 87
- Journal Issue
- 3-4
- Journal Page Range
- p. 115-119
- ISSN
- 0033-8230
- CODEN
- RAACAP
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 31030983
- Subject category
- S38: RADIATION CHEMISTRY, RADIOCHEMISTRY AND NUCLEAR CHEMISTRY;
- Descriptors DEI
- ABSORPTION SPECTROSCOPY; AMERICIUM; CARBONATES; CHEMICAL REACTION KINETICS; EUROPIUM; HDEHP; HYDRAZINE; NEPTUNIUM; OXIDATION; PLUTONIUM; SOLVENT EXTRACTION; VALENCE
- Descriptors DEC
- ACTINIDES; CARBON COMPOUNDS; CHEMICAL REACTIONS; ELEMENTS; ESTERS; EXTRACTION; KINETICS; METALS; ORGANIC COMPOUNDS; ORGANIC PHOSPHORUS COMPOUNDS; OXYGEN COMPOUNDS; PHOSPHORIC ACID ESTERS; RARE EARTHS; REACTION KINETICS; SEPARATION PROCESSES; SPECTROSCOPY; TRANSPLUTONIUM ELEMENTS; TRANSURANIUM ELEMENTS