✦ LIBER ✦

Non-linear regression of impedance data for ion transfer across liquid-liquid interfaces

✍ Scribed by T.J. VanderNoot; D.J. Schiffrin

Publisher: Elsevier Science
Year: 1990
Tongue: English
Weight: 763 KB
Volume: 35
Category: Article
ISSN: 0013-4686
DOI: 10.1016/0013-4686(90)85007-a

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✦ Synopsis

The impedance or admittance measurement of ion transfer across immiscible electrolyte interfaces involves measuring quantities which are non-linear functions of frequency and model parameters. To extract the kinetic information from the data, non-linear regression techniques must be used. A Quasi-Newton method was used to fit impedance data for base electrolyte and TEA+ transfer. It was found that Randles equivalent circuit accurately fits both sets of data but the charge transfer resistance was too small to be measurable for the base electrolyte.

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