Abstract
Abstract The biionic membrane potential was measured with the system in which a solution of calcium chloride was separated by a liquid membrane from a solution of another metal chloride. Four kinds of liquid membranes were prepared by dissolving calcium hexadecyl sulfate, stearate, cholate or deoxycholate in aqueous 1-octanol. All of the membranes studied were nearly permselective to cation. The membrane potential was analysed according to the Goldman-type equation based on the irreversible thermodynamics. The slope of a linear portion of the biionic potential vs. logarithmic activity curve showed fairly good agreement with the theoretical slope, i.e., 2.303×2RT⁄(ZCa+ZM)F per a ten-fold increase in activity, where ZCa and ZM were the valencies of calcium ion and another metal ion M existing across a membrane, respectively. The selective permeation coefficients of various metal ions were estimated for each membrane. The surprisingly small differences in the selective permeation coefficient between uni- and bi-valent cations were observed for the liquid membranes with calcium stearate, cholate or deoxycholate, while the about ten-fold increase in the coefficient per valency was observed for the liquid membrane with calcium hexadecyl sulfate. These results were discussed according to the theory previously presented.
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