Authors:A. Sanchez-Ocampo, H. Lopez-Gonzalez, and M. Jimenez-Reyes
The behavior of uranyl ion and tervalent Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu in the solvent extraction system: M–HCl–H2O–TBP has been studied together with chromatographic elution of the first nine of these rare earth elements using DOWEX 50Wx8 resin. >99.5% of the rare earth elements, with a single exception, remained in the aqueous phase of the solvent extraction system where the initial concentration of hydrochloric acid was between 4 and 6 M. Under these conditions uranyl ions were readily extracted by TBP. The rare earth elements were quantitatively eluted from the chromatographic column using 6M hydrochloric acid solution and the uranyl ions in a 0.75M sulfuric acid solution.
Authors:M. Cassir, J. Cruces, G. Pérez, M. Jiménez-Reyes, and A. Sánchez-Ocampo
We report results obtained on the separation of lanthanum, cerium, and samarium from synthetic and natural uranium samples by means of solvent extraction and ion exchange. Quantitative determinations of these elements were performed using X-ray fluorescence, polarography, and chemical or neutron activation analysis.