Abstract:

The latest standard ISO 14362-1：2017 “Textiles Methods for Determination of Certain Aromatic Amines Derived from Azo Colorants Part 1：Detection of the Use of Certain Azo Colorants Accessible with and without Extracting the Fibers”  was published in Feburary, 2017. By compared the new standard and old one, changes of contents were summarized in this pape. Meanwhile, in order to analyse the impacts on the test results, the contrast experiment was carried out with different fabric samples in accordance with the new and old standard, which including three major factors of extraction, extraction time and treatment mode of incomplete decoloration samples. Experiments results show that xylene is used in new standard for extraction, a part of samples contain more impurities interfering the testing of o-toluidine. The extraction time increases for the difficult decolorized samples avoiding incomplete decloloration of the sample. For easily decolorized samples, the decolorization can be  stopped when the decolorizing is finished, which is not limited by fixed time. The test results increased is increased by 65.8% with incomplete but obvious decoloration.

Key words: textile, banned azo colorant, aromatic amine, standard comparison