Liquid–liquid extraction of Np4+ and Pu4+ using several tetra-alkyl substituted diglycolamides
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R. B. Gujar
Abstract
Extraction behavior of Np4+ and Pu4+ was investigated using several tetraalkylsubstituted diglycolamide (DGA) extractants such as N,N,N′,N′-tetrapentyl-diglycolamide (TPDGA), N,N,N′,N′-tetrahexyl diglycolamide (THDGA), N,N,N′,N′-tetraoctyl diglycolamide (TODGA), and N,N,N′,N′-tetradecyl diglycolamide (TDDGA). The organic phases used were 0.1 M solutions of the diglycolamide extractants in n-dodecane modified with 30% iso-decanol for avoiding third phase formation while the aqueous phases contained dilute nitric acid solutions spikes with the radiotracers. The stoichiometry of the extracted species was ascertained by ligand concentration variation experiments and was found to be M(NO3)4 · 2L, where M was Np and Pu and L was the substituted DGA ligand. In general, the extraction equilibrium constant (log Kex) values for both Np4+ and Pu4+ showed an increasing trend with increasing alkyl group chain length and the log Kex values were higher for Pu4+ as compared to those for Np4+. While for Np4+, the Kex values were 7.03 ± 0.04 for TPDGA which increased steadily up to 7.98 ± 0.05 for TDDGA, for Pu4+, the respective value for TPDGA was 7.32 ± 0.05 which increased to 7.78 ± 0.03 for TDDGA. Thermodynamic parameters were also determined for the two-phase extraction equilibrium reaction.
© 2013 by Walter de Gruyter Berlin Boston
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Articles in the same Issue
- Masthead
- Masthead
- MicroSISAK: continuous liquid–liquid extractions of radionuclides at 0.2 mL/min
- Crystal structure and spectral properties of complexes of tetravalent Th, U, Np and Pu nitrates with trimethyl phosphate and dimethyl phosphate
- Heterogeneous reduction of 239PuO2 by aqueous Fe(II) in the presence of hematite
- New alkyl-pyridinedicarboxyamides as extractants for separationof trivalent minor actinides from fission products by extraction chromatography
- Liquid–liquid extraction of Np4+ and Pu4+ using several tetra-alkyl substituted diglycolamides
- Ion-imprinted polymeric nanoparticles as a novel sorbent to separate radioyttrium from Sr target
- Effect of a spacer moiety on radiometal labelled Neurotensin derivatives
- Investigaton of Kpong carbonatite as a potential source for rare earth elements (REEs) using instrumental neutron activation analysis (INAA)
- Precise age determination of a single plutonium particle using inductively coupled plasma mass spectrometer
