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nature : colloid chemistry on both sides of semipermeable membrane electrolyte balance between the theoretical concentration, in 1911 proposed by Donan. The key points are : in the same electrolyte semipermeable membrane on both sides of the chemical potential equal, if the film side of a certain sign (positive or negative) of the non-proliferation ion, with the proliferation of sexual side of the ion concentration than the other side small. Ion - exchange resin surface can be regarded as semipermeable membrane, resins within the grounds of visual fixation and counter-ions, ion composition of the electrolyte concentration. It can be deduced with the fixed ions, ion exclusion from the outside resin (adsorbed), the different ion exchangeable for selective adsorption resin conclusions. Road South can borrow membrane balance principle in the interpretation of dye staining process of proliferation. Dye and other ions exist with the bath is, anions, the right to fiber surface "film" on the two sides (in the water phase and phase between the fibers), the distribution of research and can get their distribution coefficient.
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