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EVS-EN ISO 17234-2:2011

Leather - Chemical tests for the determination of certain azo colorants in dyed leathers - Part 2: Determination of 4- aminoazobenzene (ISO 17234-2:2011)

General information

Valid from 05.04.2011
Base Documents
ISO 17234-2:2011; EN ISO 17234-2:2011
Directives or regulations
None

Standard history

Status
Date
Type
Name
05.04.2011
Main
This part of ISO 17234 is supplementary to ISO 17234-1 and describes a special procedure to detect the use of certain azo colorants in commodities, which can release 4-aminoazobenzene. The procedure also detects 4-aminoazobenzene (Solvent Yellow 1) which is already available as free amine in commodities without reducing pretreatment. Azo colorants that are able to form 4-aminoazobenzene generate, under the conditions of ISO 17234-1, the amines aniline and 1,4-phenylenediamine. The presence of these 4-aminoazobenzene colorants cannot be reliably ascertained without additional information (e.g. the chemical structure of the colorant used) or without a special procedure. The use of certain azo colorants, which may release, by reductive cleavage of their azo group(s), one or more of the other aromatic amines listed in Annex XVII of Regulation (EC) No. 1907/2006 of the European Parliament and of the Council on the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH), except 4-aminoazobenzene, cannot be determined quantitatively with this method.

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