A SOLUTION of a non-diffusible solute will in general contain the components of a mixed solvent in proportions different from those of an equilibrium, diffusate, owing to non-ideal interactions ...

R. Aris, On the Dispersion of a Solute by Diffusion, Convection and Exchange between Phases, Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Vol. 252, No.