Direct potentiometry of residual water in acetonitrile using the proton isoconcentration technique
Abstract
Direct potentiometry of the system acetonitrile –0.008–1%m/m water –10–3 mol dm–3 perchloric acid in glacial acetic acid, using a glass pH electrode and a calomel reference electrode with saturated lithium chloride in acetic acid as the internal filling solution, shows a systematic and large change in potential with variation in water concentration. This technique allows a fast and accurate determination of trace amounts of water in acetonitrile.
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