Spectrophotometric Determination Of Ethanol In Wine. Lauri Christ and Melinda Stoelk. 2006.

 

Abstract:

A single beam UV-visible spectrophotometer was used to determine the ethanol content in several wine samples by measuring the reduction of chromium (VI) to chromium (III). Four ethanol standards, ranging from 5% ethanol to 40% ethanol, were prepared with potassium dichromate, perchloric acid, and de-ionized water. The absorbance of chromium (VI) in the standards, three wine samples, and three sample blanks was determined using the spectrophotometer, the ethanol content of each standard and sample was determined with percent errors ranging from 1.0% to 78.0%.