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ABSTRACT
The solvent extraction of lanthanides (Ln) with N-m-nitrobenzoyl- and N-m-cyanobenzoyl-N-phenylhydroxylamine, was investigated. The representative lanthanides (Yb, Ho, Eu, Pr and La) Here all found to extract with compounds as self-adducts of the form, LnL3(HL) 3, where L and HL denote die ligand anion and neutral ligand, respectively. The extraction constant and separation factor were compared with those of the N-p-octyloxy derivative bof N-benzoyl-N -phenylhydroxylamine previously reported. The correlation between extractability, mutual separability of lanthanides and acidity of the reagent were discussed.