This standard specifies the method of determining the content of chlorinated phenols (2, 3, 5, 6-tetrachlorophenol and pentachlorophenol) in dye products.
This standard is applicable to the determination of chlorinated phenols (2,3,5,6-tetrachlorophenol and pentachlorophenol) in commercial dyes, dye products, dye intermediates and textile dyeing auxiliaries with the gas chromatography method-mass selective detector (GC-MSD) and gas chromatography method-electron capture detector (GC-ECD).
2 Normative References
The following normative documents contain provisions which, through reference in this standard, constitute provisions of this standard. 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.
GB/T 6682-2008 Water for Analytical Laboratory Use C 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 Theory
Chlorinated phenols in specimens shall be extracted with potassium carbonate solution. The extracting solution shall be acetylated through aceticanhydride and then subjected to chlorinated phenol acetates extraction with n-hexane. The extract shall be determined by gas chromatograph-mass selected detector (GC-MSD) and gas chromatography method-electron capture detector (GC-ECD) and quantified by external standard method.
