1997 Volume 13 Issue 6 Pages 969-974
In order to investigate the performance of different types of silicone rubber (SR) materials as matrices for ion-selective membrane electrodes, various cation-selective membranes are formulated from each of four different room temperature vulcanizing (RTV) SRs with addition of plasticizer. Four different neutral carrier-type cation ionophores (K+, Ca2+, and two Na2+) were included in this study. These SR-based ion-selective membranes were compared with the corresponding PVC-based membranes in both conventional electrode body and coated wire-type electrode formats. All of the one-component RTV SRs except for the oxime-evolving type, were shown to exhibit similar potentiometric response characteristics for a given ionophore system. It was also shown, however, that their performance is greatly dependent on the type of the neutral carrier incorporated.