Abstract
On the basis of a diffusion-layer model the selectivity coefficients of solid-state electrodes have been interpreted. In the Nernst equation the concentration of the principal ion may be expressed in terms of the diffusion coefficients D B, D C and the equilibrium constant K of the reaction AB + C ⇌ AC + B where AB represents the membrane material and C the interfering ion, in the form of an equation: [B] 0= KD B KD B + D C [B] + KD C KD B + D C [C] where the concentration with subscript “0” denotes the surface concentration directly influencing the electrode potential, and [B] and [C] are bulk concentrations of the species indicated. The differences between various literature data can be explained on the basis of this model.
Published Version
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