禁用偶氮着色剂检测新版国际标准剖析

Interpretation of new ISO standard about detection of banned azo colorants

为掌握新标准ISO 14362—1:2017《纺织品偶氮着色剂分解产生某些芳香胺的检测方法第1部分:检测经或不经萃取纤维中是否使用偶氮着色剂的方法》中更改内容对样品检测结果造成的影响,分析了新版标准内容的变化,从萃取剂、萃取时间和脱色不完全样品处理方式3方面进行了新旧标准对比实验。结果表明:新标准使用二甲苯萃取,部分样品杂质较多,对邻甲苯胺的测定有干扰;在萃取时间上,对于难脱色样品延长了萃取时间,避免了样品脱色不完全,同时对于易脱色样品,规定脱完色即可停止,不再局限于固定时间;在检测脱色不完全但脱色较明显的混纺织物时,采用新版标准,检出量结果较旧版高出65.8%。

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 February,2017. By compared the new standard and old one,changes of contents were summarized in this paper. Meanwhile,in order to analyze 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 included three major factors of extractant,extraction time and treatment mode of incomplete decoloration samples. Experiment 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 decoloration 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 result accuracy is increased by 65. 8% with incomplete but obvious decoloration.