title: The Infrared Spectroscopy Applied to Determine the Volume Fraction of Ethyl Alcohol in Alcohol-Containing Liquids
abstract: The article addresses the capacity of infrared spectroscopy to determine the strength of alcoholcontaining liquids. The method is based on calculating the ratio of optical densities of the characteristic bands of alcohol and water ( D 1045 /D 1650 ) and determining the volume fraction of ethyl alcohol in the liquid according to the calibration graph plotted in advance. The proposed method does not require sample preparation. It allows us to work with a small volume of the investigated liquid whe
journal: Theory and Practice of Forensic Science