Abstract
Extraction of microamounts of europium and americium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B−) in the presence of bis(diphenylphosphino)methane dioxide (DPPMDO, L) has been investigated. The equilibrium data have been explained assuming that the species \( {\text{HL}}^{ + } \), \( {\text{HL}}_{2}^{ + } \), \( {\text{ML}}_{2}^{3 + } \), \( {\text{ML}}_{3}^{3 + } \) and \( {\text{ML}}_{4}^{3 + } \) (M3+ = Eu3+, Am3+) are extracted into the organic phase. The values of extraction and stability constants of the species in nitrobenzene saturated with water have been determined. It was found that the stability constants of the corresponding complexes \( {\text{EuL}}_{n}^{3 + } \) and \( {\text{AmL}}_{n}^{3 + } \), where n = 2, 3 and L is DPPMDO, in water–saturated nitrobenzene are comparable, whereas in this medium the stability of the cationic species \( {\text{AmL}}_{4}^{3 + } \) (L = DPPMDO) is somewhat higher than that of \( {\text{EuL}}_{4}^{3 + } \) with the same ligand L.
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Acknowledgments
This study was supported by the Grant Agency of Faculty of Environmental Sciences, Czech University of Life Sciences, Prague, Project No.: 42900/1312/3114 “Environmental Aspects of Sustainable Development of Society,” and by the Czech Ministry of Education, Youth, and Sports, Project MSM 6046137307.
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Makrlík, E., Spíchal, Z., Vaňura, P. et al. Synergistic extraction of europium and americium into nitrobenzene by using hydrogen dicarbollylcobaltate and bis(diphenylphosphino)methane dioxide. J Radioanal Nucl Chem 295, 2135–2140 (2013). https://doi.org/10.1007/s10967-012-2227-7
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DOI: https://doi.org/10.1007/s10967-012-2227-7