Role of the Interface in the Kinetics and Mechanisms of Extraction of Nickel by 8-Quinolinols

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Abstract
The measurement of individual rate constants, as well as the quantitative determination of the contribution of the liquid-liquid interface to the overall extraction kinetics in a well known extraction system, nickel extraction by oxine and its high molecular weight analog (KELEX 100), has revealed that a three path extraction mechanism is operative. The-results indicate that the interfacial region provides a more conducive reaction medium in comparison to the bulk aqueous phase. The finding of concurrent bulk and interfacial mechanisms not only reveals the complexity that can be involved in this extraction system, but also enables one to design more efficient separation techniques based on these differences in mechanisms.