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Journal Article

Determination of effective fixed-charge density in membranes

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Chakravarti,  A.K.
Department of Physical Chemistry, Max Planck Institute of Biophysics, Max Planck Society;

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Christensen,  Bernd
Transport Proteins Group, Max Planck Institute of Biophysics, Max Planck Society;

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Langer,  Peter
Department of Physical Chemistry, Max Planck Institute of Biophysics, Max Planck Society;

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Citation

Chakravarti, A., Christensen, B., & Langer, P. (1985). Determination of effective fixed-charge density in membranes. Journal of Membrane Science, 22(1), 111-116. doi:10.1016/S0376-7388(00)80533-5.


Cite as: https://hdl.handle.net/21.11116/0000-0009-8757-D
Abstract
The fixed-charge density, X, of cation exchange membranes was determined by three different methods: (a) an analytical method, where a membrane in H+ form was equilibrated with KCl solution and the amount of exchanged ions determined, (b) the same procedure, but with electric current flow through the membrane, and (c) by measuring an electroosmotic flow through the membrane and calculating X. While methods (a) and (b) yielded essentially the same values, (c) always gave a substantially lower estimate of X. From irreversible thermodynamics, a maximum possible value of X can be calculated, which for four of five membranes tested is lower than the analytically determined charge density. The electroosmotically measured data were always within this limit.