Calcium ionophore I as very effective extraction agent for trivalent europium and americium

Emanuel Makrlík, Petr Vaňura

Abstract


Solvent extraction of microamounts of Eu3+ and Am3+ from water into nitrobenzene by means of a mixture of hydrogen dicarbollylcobaltate (H+B-) and calcium ionophore I (L) was investigated. The equilibrium data have been explained assuming that the species HL+, HL2+,ML23+ and ML33+ (M3+ = Eu3+, Am3+) are extracted into the organic phase. Extraction and stability constants of the cationic complex species in nitrobenzene saturated with water have been determined and discussed. It was proven experimentally that this ligand L could be considered as a very strong receptor for the Eu3+ and Am3+ cations.


Keywords


liquid-liquid extraction; europium and americium; calcium ionophore I; extraction and stability constants; water-nitrobenzene system

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