外部発生クーロン滴定法の検討

概要

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A new coulometric titration device was presented in which the electrolysis at a constant current was carried out by supplying an electrolyte solution into an external generating cell at a given flow rate and the flow of the electrolyte was automatically stopped simultaneously with the cutting off of the generating current. By this means of synchronization, a given concentration of the external generating reagent could be maintained throughout the titration regardless of frequent intermissions of the electrolysis. In the experiment, a mixed electrolyte solution of 0.5M sodium nitrate and 0.02M acetic acid was used and the chloride ion was titrated with silver ion generating from a silver electrode. The end point was determined amperometrically and the titration was found to give good results. It was especially satisfactory when the "hold up" of the cell was small. By use of this means, the amount of liquid flowing out dropwise was not increased unnecessarily large in amount even with the repetition of discontinuous electrolysis and this offered an advantage for determination of the end point without any correction for the dilution in the reading of the indicator current.
社団法人日本分析化学会の論文