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Methods available for study of adsorption of ions at electrodes are briefly reviewed and results obtained for the adsorption of alkaloid ions at mercury are described. The necessity for development of a thermodynamically rigorous technique for determination of adsorption at solid electrodes is stressed. For organic ions and molecules which absorb in a convenient wave length region (visible or u.v.), adsorption of the ions may be followed directly at solid electrodes in situ in a special cell in which both u.v. extinction and potential measurements can be made simultaneously. Results obtained with acridine, acridinium chloride, quinolinium chloride, quinoline and pyridine …
