INFLUENCE OF COMPOSITION AND SOME PHYSICOCHEMICAL PROPERTIES OF 2-PHASE LIQUID-SYSTEMS ON THE STATIONARY-PHASE RETENTION IN A COIL PLANET CENTRIFUGE

The present work is an attempt to correlate the composition and some p hysico-chemical properties of two-phase systems with the stationary ph ase retention in a coil planet centrifuge of J-type. Complex liquid sy stems containing an organic solvent (n-decane or chloroform), an extra cting reagent (di-2-ethylhexylphosphoric acid, D2EHPA), water and a mi neral salt (ammonium sulphate) are considered. The extractant addition s in the organic phase and the salt additions in the aqueous phase lea d to the change of the physicochemical properties (viscosity, density, interfacial tension) of the liquid system and affect, strongly, the s tationary organic phase retention. The influence of the rotation speed on the stationary phase retention for systems based on D2EHPA in chlo roform and (NH4)(2)SO4 in water has been also investigated.