[in Japanese]

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[in Japanese]

View full abstract

[in Japanese]

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To analyze the measured membrane potentials, Henderson model or Goldman model is generally used. The difference between the two models has not been discussed in detail so far, because these two theoretical approaches give similar results for many cases.It is, however, important for identification of membrane properties to make clear the difference between them precisely.In this paper, it is pointed out that Henderson assumes the same distribution function for cations, anions and membrane charge density, while Goldman assumes different distribution functions for cations, anions and membrane charge density. For homogeneously charged membrane or uncharged membrane, the Goldman model is valid only for the case where the diffusion of ions is negligible.For a1-1electrolyte unicomponent solution, the experimental conditions are investigated in order to find out which model is more suitable for the membrane under study.The following conditions are recommended: (1) The electrolyte concentration in bulk solution is very higher than the membrane charge density. (2) The difference in transference number between colon and counterion, τo, is approximately±0.7. (3) The concentration ratio of the bulk solutions separated by the membrane, γ, is larger than10or smaller than0.1.

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