Methods for the Quantitative Determination of Biocides in Tobacco and Tobacco Products. Part IV: A Method for the Determination of Maleic Hydrazide in Tobacco/Methoden zur quantitativen Bestimmung von Bioziden in Tabak und Tabakerzeugnissen. IV. Mitteilung: Eine Methode zur Bestimmung von Maleinsäurehydrazid

The author's method (developed in 1966) for the determination of maleic hydrazide in tobacco has been improved by the introduction of a purification step using activated carbon. Interferences produced by reactive compounds other than maleic hydrazide can thus be eliminated. The procedure proved to be suitable for routine analysis. The coefficient of variation was found to range from 1 to 7 %. Added amounts of maleic hydrazide have been recovered at the 90-105 % level. The accuracy of the procedure could be confirmed by results comparatively obtained in three laboratories