Precipitate impregnated membranes : III. Membrane potentials and the behaviour of ions at the BaSO4-cellophane membrane
article
1. The membrane potentials measured at the BaSO4‐cellophane membrane point to selectivity of its permeability, supporting the conclusions drawn from previously reported direct permeation experiments.
2. In the presence of permeating ions other than H+ and OH−, the membrane potential at the BaSO4 membrane is not exclusively dependant on the pH's of the adjacent solutions. Other ions, e.g. K+ and Cl−, may even take over the predominating role in the development of the membrane potential – in non‐quilibrium states.
3. In non‐equilibrium systems with other permeating ions besides H+ and OH−, spontaneous ion redistribution takes place and the system changes towards a Donnan equilibrium. The rate at which these changes take place greatly depends on the composition of the two adjacent solutions. The changes are often very slow.
4. The eventually reached equilibrium state is a (double) Donnan equilibrium. The fact that Donnan equilibria could be established under favorable conditions, is a further proof for the selective permeability of the BaSO4 membrane.
5. An electrochemical hypothesis is given as a possible explanation of the observations on BaSO4 membranes so far described. © 1961 Wiley
2. In the presence of permeating ions other than H+ and OH−, the membrane potential at the BaSO4 membrane is not exclusively dependant on the pH's of the adjacent solutions. Other ions, e.g. K+ and Cl−, may even take over the predominating role in the development of the membrane potential – in non‐quilibrium states.
3. In non‐equilibrium systems with other permeating ions besides H+ and OH−, spontaneous ion redistribution takes place and the system changes towards a Donnan equilibrium. The rate at which these changes take place greatly depends on the composition of the two adjacent solutions. The changes are often very slow.
4. The eventually reached equilibrium state is a (double) Donnan equilibrium. The fact that Donnan equilibria could be established under favorable conditions, is a further proof for the selective permeability of the BaSO4 membrane.
5. An electrochemical hypothesis is given as a possible explanation of the observations on BaSO4 membranes so far described. © 1961 Wiley
Topics
TNO Identifier
34550
DOI
https://doi.org/10.1002/recl.19610800404
Source
Recueil des travaux chimiques des Pays-Bas, 80(4), pp. 376-390.
Pages
376-390
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