Determination of Ethanol in Wine and Distilled Alcoholic Beverages Using a Smartphone as a Detector

Abstract

This paper describes the application of a smartphone as a detector in the determination of ethanol in distilled beverages. Digital image analysis as an analytical tool is a reality nowadays, and the use of smartphones stands out due to its high accessibility and practicality. The aim is to determine ethanol in distilled beverages using two cheap and simple methods using a smartphone as a detector. Two methods were used, with phenanthroline (method A) and with potassium dichromate (method B) as a reagents and two detectors, spectrophotometer and smartphone. Linear dependence of signal was achieved in the concentration range: from 1.0 to 65.0% (v/v) for method A and from 7.0 to 50.0% (v/v) for method B. The concentration range that is linear with the signal is wide and allows sufficient sensitivity and thus gives the possibility to determine a variety of distilled beverages. Comparison of the obtained results shows that the smartphone and the proposed reagents can be used in routine analysis in quality control of used samples. The results obtained are comparable with the results obtained using a spectrophtometer or with nominal values. The method proved to be simple and inexpensive for the determination of ethanol, does not use expensive reagents neither laborious procedures to carry out the analysis.