BS EN ISO 17234-2:2011

Foreword
1 Scope
2 Normative references
3 General
4 Principle
5 Safety precautions
6 Apparatus
7 Reagents
8 Sampling
9 Procedure
10 Evaluation
11 Test report
Annex A (informative) - Chromatographic analyses
Annex B (informative) - Reliability of the method
Annex C (informative) - Assessment guide - Interpretation
        of analytical results
Bibliography

Specifies a special procedure to detect the use of certain azo colorants in commodities, which can release 4-aminoazobenzene.

This part of ISO17234 is supplementary to ISO17234-1 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 ISO17234-1, 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 AnnexXVII 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.