Abstract
Synergic extraction of europium (III) by thenoyltrifluoroacetone (HTTA) in the presence of 2,2′-dipyridyl, or 1,10-phenanthroline and its 2,9-dimethyl derivative was performed from aqueous 2 M NaClO 4+0.01 Na acetate buffer at pH equal to 4.33 and at 25°C. The organic solvents considered were cyclohexane, benzene, carbon tetrachloride and chloroform. It has been shown by using the slope analysis method of the distribution curves that in this synergic system only 1:1 mixed complexes, e.g. Ln(TTA) 3·B, where B is any of the above cited amines, are involved irrespective of the organic solvent used. The extraction constants K ex of Eu(TTA) 3B as well as the formation constants of the extractable synertic adduct are given for the various solvents.
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