Solvent extraction of trivalent europium and americium into nitrobenzene by using hydrogen dicarbollylcobaltate and tetraisopropyl[oxybis(2,1-ethanediyliminocarbonyl)]-bisphosphoramidate

Emanuel Makrlík, Petr Vaňura, Pavel Selucký, Vasily Brusko

Abstract


Solvent extraction of micro-amounts of Eu3+ and Am3+ from water into nitrobenzene by means of a mixture of hydrogen dicarbollylcobaltate (H+B-) and tetraisopropyl[oxybis(2,1-ethanediyliminocarbonyl)]-bisphosphoramidate (L) was studied. The equilibrium data were explained assuming that the species HL+, ML23+ and ML33+ (M3+ = Eu3+ or Am3+) are extracted into the org­anic phase. Extraction and stability constants of the cationic complex species in nitro­benzene saturated with water were determined and discussed. From the experi­mental results, it is obvious that this effective ligand L for the Eu3+ and Am3+ could be considered as a potential extraction agent for nuclear waste treatment.


Keywords


liquid–liquid extraction; europium; americium; N-phosphor¬ylated bis-urea; extraction and stability constants; water–nitrobenzene system

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DOI: https://doi.org/10.2298/JSC170220110M

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