RETENTION OF THE STATIONARY-PHASE IN A COIL PLANET CENTRIFUGE - EFFECTS OF INTERFACIAL-TENSION, DENSITY DIFFERENCE, AND VISCOSITIES OF LIQUID-PHASES

The influence of interfacial tension, density difference and viscositi es of immiscible liquid phases on the stationary phase retention in a coil planet centrifuge has been studied. Two-phase liquid systems cont aining organic solvent (n-decane), extracting reagent (di-2-ethylhexyl phosphoric acid), water, surfactant (sodium salt of dodecylbenzenesulp honic acid) and mineral salt (ammonium sulphate) have been considered. Varying concentrations of the system constituents allows selectively changing the interfacial tension, density difference or viscosity, all other conditions remaining the same. It has been shown that these par ameters, especially interfacial tension, strongly affect the stationar y phase retention. The data obtained are in good agreement with propos ed theoretical models.