Abstract
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.
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