Abstract
Exchange currents have been determined using impedance measurements on liquid membranes consisting of a solution of valinomycin in 2,3-dimethylnitrobenzene, supported on a cellulose acetate filter. Various time-dependent effects have also been investigated by the same method. This valinomycin-based membrane provides a model system for some commercial ion-selective electrodes. The results indicate that potassium ions readily cross the water/liquid membrane interface, whilst sodium ions are largely excluded from the membrane. A complex situation appears to exist, whereby a general increase in bulk membrane resistance is offset to a greater or lesser extent (depending on the cation in the contacting solutions) by a reduction in resistance of the membrane phase due to cation uptake.
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