Abstract
EQUILIBRIUM osmotic pressure measurements on salt-free solutions of a polydisperse polyelectrolyte may be seriously affected if even a small fraction of the polyelectrolyte penetrates the membrane, especially if the volume of the diffusate is much smaller than that of the solution. This applies to some transducer osmometers and also to methods in which the osmotic pressure is measured by the equilibrium swelling of a small piece of gel immersed in the solution1,2. The effect of a small permeant fraction rapidly becomes smaller as the concentration of a supporting electrolyte is increased from zero to excess.
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