Determination of the N-Nitrosodimethylamine Content of Beer and Malt. A Collaborative Trial

Dr. V. Kellner. Published on behalf of the European Brewery Convention. Received October 1999.

Abstract
After about fifteen years a study was carried out to determine the variation in results of the N-nitrosodimethylamine (NDMA) determination in beer and malt carried out in different laboratories, in order to obtain an overall view of the precision of the various methods used. Two collaborative trials were carried out by the EBC Analysis Committee during 1998. Repeatability values (195) for beer in the range of 0.09 - 0.13 and for malt 0.33 --. 0.42 were found. Reproducibility values (R95) for beer in the range of 0.45 � 0.54 and for malt 0.65 - 4.08 were obtained.
Keywords: Collaborative trial, ring test, NDMA, N-nitrosodimethylamine (determination of), beer, malt  

Sintesis
Despu�s de quince a�os se llevo a cabo un estudio para determinar la variaci�n en los resultados de la determinaci�n de Nnitrosodimetilamina (NDMA) en la cerveza y malta en diferentes laboratorios, con el objeto de obtener una panor�mica de la precisi�n de los varios m�todos usados. Dos ensayos colaborativos se llevaron a cabo por el Comit� de An�lisis EBC durante 1998. Se encontraron valores de repetici�n (195) en el rango de 0.09 1 O~ 13 para la cerveza y de 0.33 - 0.42 para la malta. Se obtuvieron valores de reproducci�n (R95) en el rango de 0.45 + 0.54 para la cerveza y de 0.65 - 4.08 para la malta.