Summary
It has been shown experimentally that two different potentials appear across an intra-nonpermutating membrane3 when two different solutions (e.g., solution I: 0.1n NaCl+0.0001n KCl; and, solution II: 0.1n KCl + 0.0001n NaCl) are separated by such a membrane, and when the pores of the intra-nonpermutating membrane are supplied with ions from either solution I or solution II (in this case: essentially with Na+ ions from solution I, or essentially with K+ ions from solution II). The theoretical background, and other considerations, for these experiments will be found in reference.
References
W. Kuhn undA. Ramel, Helv. chim. Acta42, 293 (1959).
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Kuhn, W., Kuhn, H.J., Walters, D.H. et al. Experimentelle Feststellung dualer Potentiale an intra-nicht-permutierenden Membranen. Experientia 15, 275–278 (1959). https://doi.org/10.1007/BF02158083
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DOI: https://doi.org/10.1007/BF02158083