Response of Liquid-Membrane Calcium-Selective Electrodes To Calcium Ion Activity Steps

Authors

Thomas Berube, The University of North Carolina at Chapel HillFollow
Richard P. Buck, The University of North Carolina at Chapel HillFollow
Ernö Lindner, Budapest University of Technology and Economics
Klàra Tòth, Budapest University of Technology and Economics
Etnö Pungor, Budapest University of Technology and Economics

Abstract

The results of fast Ca2+ activity step experiments using ionophore- and ion exchanger-based Ca2+-selective liquid membrane electrodes are presented. The recorded curves indicate that there Is little dependence of electrode response on activity range or active electrode material. The response is shown to be dependent on the age of the ion-selective electrode (ISE) membrane. Impedance experiments performed show large fluctuations in the membrane bulk resistance over time. These results suggest that the membrane rapidly changes structure over a short period of time, which results in a slowing of the ISE response. © 1991, Taylor & Francis Group, LLC. All rights reserved.

Publication Title

Analytical Letters

Recommended Citation

Berube, T., Buck, R., Lindner, E., Tòth, K., & Pungor, E. (1991). Response of Liquid-Membrane Calcium-Selective Electrodes To Calcium Ion Activity Steps. Analytical Letters, 24 (3), 505-518. https://doi.org/10.1080/00032719108052921