Analysis of Azo Dyes in Leather and Textiles

Keywords product safety textiles leather azo dyes cancerogenic amines EN ISO standard method fast full scan detection quantitation confirmation library 

The EU Commission classified 22 amines as proven or suspected human carcinogens. Azo dyes which, by reductive cleavage of one or more azo groups, may release one or more of these aromatic amines in detectable concentrations, that is above 30 ppm in the finished articles or in the dyed parts thereof may not be used in textile and leather articles which may come into direct and prolonged contact with the human skin or oral cavity (European Commission, 2002). The EU Directive 2002/61/EC has banned the use of dangerous azo colorants, placing textiles and leather articles coloured with such substances on the market, and requested 

The MS was set to run in full scan mode, providing the complete mass spectra of the detected compounds for identification, confirmation and quantitation. The complete list of azo compounds and internal standards is given in Table 4.29 with retention times for the given analytical conditions and the masses for the selective quantitation (Purwanto and Chen, 2013). 

Compounds are unstable and tend to deteriorate at temperatures above 20 C 

Column TG-35MS or equivalent polarity column 30 m length x 0.25 mm ID X 0.25 pm film thickness 

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