Mechanism of Electrochemical Solvent Extraction of Divalent Metal Ions With Quinolin-8-ol

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Abstract
The transfer of divalent metal ions (M2+ = Mn2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Pb2+) facilitated by quinolin-8-ol (HQ) at the nitrobenzene–water interface was studied by polarographic and voltammetric techniques. In conflict with a proposed mechanism that assumes the interfacial transfer of a divalent complex ion [M(HQ)2 2+], the observed current–potential curves showed characteristics similar to those of a reversible wave for monovalent-ion transfer. In this study, a new mechanism was proposed in which two monovalent ions (MQ+ and H2Q+) are responsible for the ion-transfer current. The theoretical equation of the current–potential curve derived for the new mechanism was found to be useful for obtaining a better understanding of the ion-transfer processes.

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