Abstract
The extraction of lanthanide nitrates from 0.5 M NaNO3 solutions in 1 : 1 : 1 ternary aqueous organic systems using mixtures of trioctylammonium dialkyl phosphate and dicyclohexylammonium caprylate as extractants was studied. The extractability of lanthanides was shown to increase in the series La < Pr < Nd, Sm, Eu < Gd < Tb < Dy < Ho < Er < Tm, in which the atomic number of the metal increases. The selectivity of extraction in the ternary system was observed during the extraction of heavy lanthanides.
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