This standard specifies the permissible limit and determination method (see Appendix A) of harmful aromatic amines in dyed product.
This standard is applicable to each dosage forms of commercial dyes, dye products, dye intermediates and textile dyeing auxiliaries.
2 Normative References
The following referenced documents are indispensable references, only the edition cited applies. For dated reference, only the dated editions are applicable to this standard. For undated references, the latest editions (including all the amendments) are applicable.
GB/T 6682-2008 Water for Analytical Laboratory Use-Specification and Test Methods (ISO 3696: 1987, MOD)
GB/T 8170-2008 Rules of Rounding off for Numerical Values & Expression and Judgment of Limiting Values
3 Requirements
Content of each kind of harmful aromatic amines (see Appendix A) in products such as dyestuff shall be less than or equal to 150mg(aromatic amine)/kg (product); harmful aromatic amine limit of liquid dye and pigment printing paste etc. in dye product shall be converted according to its solid content.
4 Principles
Reductive decomposition with sodium hydrosulfite shall be carried out for dye sample in citrate buffer solution (pH=6.0), aromatic amine in splitting solution shall be extracted directly by organic solvent and, then after concentration, it shall be inspected by gas chromatography - mass spectrometer.
