ISO 17234-2:2011 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.
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Sisällysluettelo
Foreword
1 Scope
2 Normative references
3 General
4 Principle
5 Safety precautions
6 Apparatus
6.9 Instrumental equipment
7 Reagents
7.9 Standard solutions
8 Sampling
9 Procedure
9.1 Degreasing
9.2 Reductive cleavage
9.3 Separation and concentration of 4-aminoazobenzene
9.4 Calibration solution
9.5 Check of the analytical system
9.6 Chromatographic analyses
10 Evaluation
10.1 Calculation with internal standard
10.2 Calculation without internal standard
10.3 Reliability of the method
11 Test report
Annex A Chromatographic analyses (informative)
Annex B Reliability of the method (informative)
Annex C Assessment guide — Interpretation of analytical results (informative)
ISO 2418:2002 Leather -- Chemical, physical and mechanical and fastness tests -- Sampling location
ISO 4044:2008 Leather -- Chemical tests -- Preparation of chemical test samples
ISO 2418:2002 Leather -- Chemical, physical and mechanical and fastness tests -- Sampling location
ISO 4044:2008 Leather -- Chemical tests -- Preparation of chemical test samples