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5436442 
Journal Article 
Normal pulse voltammetry for facilitated ion transfer processes across two immiscible liquid-liquid interfaces 
Liao, YB; Okuwaki, M; Kitamura, F; Ohsaka, T; Tokuda, K 
1998 
Yes 
Electrochimica Acta
ISSN: 0013-4686 
44 
1 
117-124 
WOS:000076093600015 
Kinetics of facilitated ion transfer across the interface between water/nitrobenzene and water/1,2-dichloroethane has been studied by normal pulse voltammetry using a micro-interface supported at the tip of a glass capillary. An equation for current response to potential-step signals under spherical diffusion conditions has been derived and applied to the analysis of the voltammograms for transfer of Ba2+, Sr2+ and Na+ facilitated by dibenzo-18-crown-6 (DB18C6) and dibenzo-24-crown-8 (DB24C8). It has been found that the transfers of Ba2+ and Sr2+ facilitated by the crown ethers across water/nitrobenzene interface have formal rate constants of the order of 10−2 and 10−3 cm/s, respectively. It has also been found that the formal rate constant for transfer of Na+ is higher than the determinable limit by the method employed. 
facilitated ion transfer; microinterface; normal pulse voltammetry; kinetics