Voltammetric Ion-Selective Electrodes (VISE)

Abstract

Voltammetric ion-selective electrodes (VISE) based on a traditional principle with internal electrolyte as well as solid-state devices in the form of electrochemical one-shot teststrip are developed. In the latter the interfering polarization at the solid-state backside contact can be avoided by increasing the contact area and thus decreasing the current density at this interface drastically as compared to the interface ISE-membrane/sample. The chemically modified electrodes described here will hopefully replace the highly toxic mercury electrodes used in stripping analysis. In the development of highly reproducible screen-printed VISE, controlling the area of the active membrane surface is much easier. Therefore, it is possible to produce many VISE with absolutely identical features opening the route to precalibrated devices without any need for additional recalibration by the end user.