Electrochemical studies on ion-selective polymer membrane electrodes |
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Authors: | Charlene D Crawley Garry A Rechnitz |
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Institution: | Department of Chemistry, University of Delaware, Newark, DE 19716 U.S.A. |
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Abstract: | The selectivity and response of neutral carrier based polymer membrane electrodes are investigated via exchange current measurements for systems containing valinomycin, dibenzo-18-crown-6, and plasticizer alone in a polyvinyl chloride matrix. Using a transient galvanostatic step method, apparent exchange current densities of 1.3 X 10?3 A/cm2, 5.4 X 10?6 A/cm2, and 2.2 X 10?9 A/cm2 were obtained with K+ as the primary ion for the three types of membranes, respectively. Preliminary results indicate that the exchange current data obtained with this technique are complementary to the potentiometric response observed for the membranes studied. |
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