Abstract
The poisoning of commercial anion-selective membranes by sodium dodecylsulphate (SDS) was studied.The DS- ions exchange stoichiometrically with the original counterions in the membranes. During this poisoning the volume of the membranes increases and the water content decreases. Moreover, the membranes show a very strong increase of the resistance and a decrease of the permselectivity tending towards zero. Completely poisoned membranes can sorb small quantities of SDS. In consequence of this, the resistance decreases and the membranes become cation-selective.During electrodialysis of a NaCl solution containing 5.10-4M SDS a ldquo;soap layerrdquo; is formed at the diluate side in the membranes. The chloride ions are transported through this layer partly by diffusion of NaCl.
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