Influence of aggregation on the extraction of trivalent lanthanide and actinide cations by purified Cyanex 272, Cyanex 301, and Cyanex 302
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M. P. Jensen
Summary
The extraction of trivalent lanthanide (Sm3+, Eu3+) and actinide (Am3+, Cm3+) cations from 1.0 M NaNO3 into n-dodecane solutions of bis(2,4,4-trimethylpentyl)phosphinic acid (HC272), bis(2,4,4-trimethylpentyl)monothiophosphinic acid (HC302), and bis(2,4,4-trimethylpentyl)dithiophosphinic acid (HC301) is reported. In each case, the dependence of the distribution ratios on the total extractant concentration is approximately second power. Using NMR, the dimerization constant of HC301 is determined to be 0.67 ± 0.06 at 25.0 °C in deuterated n-heptane, implying that the average aggregation of the extractant changes greatly across the extractant concentration range studied. When the effect of aggregation is considered for each of the extractants, the stoichiometries of the extracted complexes are found to be M(H(C272)2)3, M(C302)3, and M(C301)3.
© Oldenbourg Wissenschaftsverlag, München
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Articles in the same Issue
- Charge and mass distribution in 7Li induced fission of 232Th
- Direct evidence for enhanced inner-sphere chloro complexation of Eu(III) and Cm(III) in anion exchange resin phase studied by time-resolved laser-induced fluorescence spectroscopy
- Plutonium separation by solvent extraction for the determination by photon electron rejecting alpha liquid spectrometry
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- Extraction of silver from nitric acid medium by certain quinoline derivatives
- Electrochemical separation and purification of yttrium-86
- Radiobromination of closo-dodecaborate anion. Aspects of labelling chemistry in aqueous solution using Chloramine-T
- Metal-ion speciation in blood plasma incorporating the water-soluble polymer, polyethyleneimine functionalised with methylenephosphonate groups, in therapeutic radiopharmaceuticals
