This standard specifies the detection methods for the banned azo colourants (in textile products) which can decompose carcinogenic aromatic amines (see Appendix A).
This standard is applicable to the textile products after dyeing and printing.
2 Normative References
The following documents are essential to the application of this document. For dated references, only the dated edition of the document is applicable to this standard. For undated references, the latest edition (including all the amendments) of the document is applicable to this standard.
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
GB/T 23344 Textiles-Determination of 4-aminoazobenzene
3 Principle
Textile sample uses sodium hydrosulfite for reduction and decomposition to generate potential carcinogenic aromatic amine in the medium of citrate buffer solution; extract aromatic amine in the solution with proper solution - solution partition column, and scale the volume with appropriate organic solvent after concentrating; carry out determination with gas chromatograph (GC/MSD) which is equipped with mass selective detector. If necessary, select another one or more methods to confirm the isomer. Carry out quantification with high pressure liquid chromatography -diode array detector (HPLC /DAD) or gas chromatography -mass spectrograph.
