Abstract
Interfacial tension isotherms were determined for individual palladium(II) extractants and interpreted. The following extractants were considered: 4-alkylphenylamines containing from 6 to 14 carbon atoms in the alkyl group, dihexylsul-fide, 2-hydroxyethyldecyl sulfide and its partly fluorinated derivative, decylnicotiniate and N,N-dihexylpyridine-3-car-boxamide. 4-Alkylphenylamines exhibited significantly stronger interfacial activity than did the other extractants. They adsorbed at the hydrocarbon/water interfaces already at concentrations 10-5 M and permit to decrease the interfacial tension to 5 mN m-1. As a result, they can be used as a phase transfer catalyst to increase the rate of palladium(II) extraction with other extractants. When used alone, the initial rate of extraction increases with the extractant increasing hydropho-bicity, thus in the order of increased interfacial activity.
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