Direct Potentiometry of Ethanol in Alcoholic Beverages Using Ion-Selective Electrodes. G. J. Kakabadse, M. S. Al-Aziz, M. R. O. Karim, R. Perry, and A. E. Tipping, Department of Chemistry, University of Manchester Institute of Science and Technology, P.O. Box 88, Manchester, M6O 1QD, UK; and J. Cabral and A. P. Carvalho, Department of Chemistry, University of Oporto, Portugal. J. Am. Soc. Brew. Chem. 49:0019, 1991.

Under ion-isoconcentration conditions, ion-selective electrodes were used as ethanol sensors in aqueous systems over the concentration range 0-99.9% ethanol in batch and continuous analyses. Sample concentrations were read from a calibration graph, obtained from two standard solutions, using a fluoride electrode for the concentration range 0-90% ethanol and a pH glass electrode for concentrations above 90% ethanol. The method developed is accurate, reproducible, and economical.

Keywords: Alcoholic beverages, Electrode, Ethanol concentration, Ion-isoconcentration technique