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See Chinese contents: GB/T 33392-2016 GB/T 33392-2016: Leather and fur -- Chemical tests -- Determination of 4-aminoazobenzene derived from azo colorants
This Standard specifies the test method of gas chromatography-mass spectrometry and high-performance liquid chromatography of 4-aminoazobenzene (CAS number: 60-09-3) that is decomposed from certain azo dyes in leather and fur and exists in free form. This Standard is applicable to all kinds of leather, fur and their products.
