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Determination of the accuracy, repeatability and reproducibility of a method for the determination of alcohol in beer by Near Infra Red Spectroscopy
Mundy, A. and Varj, P.

A method for the determination of alcohol in beer by Near Infra Red Spectroscopy was collaboratively tested by the Analysis Committee of the European Brewery Convention according to ISO Standard 5725 in order to determine its suitability for publication in Analytica-EBC. Accuracy, repeatability r95 and reproducibility R95 values are presented. The NIR method was found to have better within and between laboratory precision than the reference distillation method for the determination of alcohol Repeatability r95 was found to be independent of the mean value and was 0,032 % V/V over the range 2,18 to 8,77 % V/V alcohol. Reproducibility R95 was found to be dependent on the mean and is 0,017m + 0,006 % V/V over the range of alcohol tested. The NIR method has acceptable accuracy when compared to the distillation method. The method is recommended for inclusion in Analytica-EBC.

Descriptors: Analytica-EBC, method development, determination of alcohol, NIR-spectroscopy

BrewingScience - Monatsschrift fr Brauwissenschaft, 58 (March/April 2005), pp. 23-27