Abstract
Donnan potential is extended to the stationary state on the basis of continuity of the electrochemical potential at phase boundary. Donnan potential in the stationary state for the mono-mono-valent electrolyte is expressed by ψ= RT F 1n 2b +c l + −θ+ θ 2+4b +b −c l +c l − where R, T and F have their usual thermodynamic meanings; θ is the charge density in the membrane phase, subscripts + and − stand for the cation and anion respectively, superscript l represents the liquid phase, b is the partition coefficient and c the concentration of ions. If b + = b − = 1, this equation gives the Donnan equilibrium potential; and if θ = 0 gives the surface potential (Polissar, 1954). It is demonstrated herein that the Goldman potential contains the Donnan potential in the stationary state.
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