EFFECT OF DILUENTS ON THE INTERFACIAL PRO PERTIES OF HDEHP

The interfacial properties of HDEHP in different diluent - 0.05mol/L ( H-2, Na-2) SO4 (pH = 2.40) systems have been studied with the Drop Met hod. The interfacial parameters, c(min), Gamma(max), A(i) and Delta G( ad), of HDEHP have been obtained. It was suggested that the monomeric HDEHP molecule was the species adsorbed on the interface. The interfac ial activity of HDEHP in different system decreased as follows: alipha tic hydrocarbon, aromatic hydrocarbon, carbon tetrachloride, chlorofor m, MIBK. This might be attributed to the molecular interaction between diluent and extractant or (and) diluent and water immediately adjacen t to the interface. The extraction kinetics with HDEHP in different di luents has also been discussed.