INTERFACIAL KINETICS IN THE EXTRACTION OF COPPER(II) AND NICKEL(II) WITH 2'-HYDROXY-5'-NONYLBENZOPHENONE OXIME

The kinetics of the extractions of copper(II) and nickel(II) with 2'-hydroxy-5'-nonylbenzophenone oxime (HL) in heptane was studied by means of a high-speed stirring apparatus. Linear correlations were established between the initial extraction rate of the metal ions and the amount of HL adsorbed at the liquid-liquid interface. The rate-controlling step was the reaction between L- at the interface and the metal ions in aqueous phase adjacent to the interface. A solvent effect of heptane and chloroform on the interfacial mechanism of the extraction of nickel(II) was also examined.