Determination of ethanol using flow injection enthalpimetry

Abstract

A flow injection enthalpimetric method for the determination of ethanol in fuel-grade ethanol, based on the heat of dilution of ethanol, is described. The accuracy and precision were 0.05% of ethanol; interferences by several substances are discussed. A similar procedure was also applied to the determination of ethanol in wines and spirits after distillation, yielding a precision of 0.03–0.1% of ethanol. The sampling rate in both procedures is 110 h^–1.