Determination of the pHe value of denatured ethanol fuel in accordance with ASTM D6423

The pHe value is a measure of the acidity of alcohol-based fuels. In ethanol, pHe is an important parameter for fuel quality specification with respect to the risk of motor damage. This Application Note describes pHe determination in a denatured ethanol mixture in accordance with ASTM D6423. Determination is implemented using a 913 pH Meter and the EtOH-Trode.