1 Scope
This part of SN/T1045 specifies the gas chromatography/mass spectrometry test method to determine the content of 23 banned aromatic amines (see Annex A) in dyed textiles and leather products.
This part is applicable to the testing of 23 banned aromatic amines in dyed textiles (including cotton, linen, silk, wool, chemical fiber, etc.) and dyed leather products for import and export.
2 Normative References
The following standards contain provisions which, through reference in this part of SN/T1045, constitute provisions of this part. For dated references, subsequent amendments (excluding corrections) to, or revisions, of any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest editions apply to this part.
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
SN/T 1045.1 Determination of Banned Azo Colourants in Dyed Textiles and Leather Products for Import and Export - Part 1: High Performance Liquid Chromatography Method
3 Theory
In the citrate buffer (pH = 6.0), the azo colourants in the specimen is reduced to the corresponding aromatic amine intermediate by sodium hydrosulfite. The aromatic amine in the aqueous solution is extracted with a methyl tert butyl ether - dichloromethane mixed solvent. The aromatic amine in the extract is acidified to a salt by hydrochloric acid and sodium silicotungstate (Na8SiW11O39•nH2O) solution, and then concentrated, with the residue washed with an organic solvent. After alkalization, the free aromatic amine is extracted with methyl tert butyl ether and scaled to volume for gas chromatographic/mass spectrometric analysis.
4 Reagents
Foreword i
1 Scope
2 Normative References
3 Theory
4 Reagents
5 Instruments and Apparatus
6 Analytical Procedures
7 Minimum Detection Limit
8 Precision
Annex A (Normative) Chemical Names and CAS RN of 23 Kinds of Banned Aromatic Amines
Annex B (Informative) Infrared and Ultraviolet Spectrograms of Sodium Silicotungstate (Na8SiW11O39•nH2O)
Annex C (Normative) Polyester Specimen Pretreatment Method
Annex D (Informative) Quantitative and Qualitative Selected Ion of Aromatic Amines
Annex E (Informative) Total Ions Chromatogram of the Standards
