Studies on Membrane Permeability by the Membrane Electrode Method. II

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Abstract
To examine the membrane permeability of ions, collodion membrane was prepared and used as the membrane electrode to carry out potentiometric titration of the systems of aniline sulfate-barium chloride, aniline hydrochloride-silver nitrate, and phenylenediamine hydrochloride-silver nitrate. As previously mentioned, the collodion membrane selects and transfers anions when the above-mentioned organic amines are titrated with inorganic electrolytes, although it usually transfers cations. The electric potential of the system of phenylenediamine was twice as large as that of aniline. A collodion membrane, dipped one hour previously in aniline sulfate solution, was used after being dried. As the drying time was made longer, the electric potential was found to become larger. A collodion membrane, dipped two days previously in aniline sulfate solution, was used for the potassium sulfate-barium chloride system. The membrane obviously showed anion selectivity and this property was still maintained after one month in water.It was assumed that the collodion membrane combined with these organic amines through Van der Waals' forces which rose when a part of the benzene ring of these compounds contacted the membrane and that consequently the membrane acquired anion selectivity.

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