This standard specifies the theory, reagents and materials, instruments and apparatuses, determination procedures, blank test, test data processing, determination lower limit, recovery rate, precision and test report for the determination of short chain chlorinated paraffins in textiles dyeing and finishing auxiliaries.
This standard is applicable to the determination for the content of short chain chlorinated paraffins (C10~C13) in textiles dyeing and finishing auxiliaries.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 6682 Water for analytical laboratory use - Specification and test methods (GB/T 6682-2008, ISO 3696: 1987, MOD)
GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgment of limiting values
3 Theory
Extract the specimen with n-hexane by vibration, then purify the extracted solution and dilute it to a constant volume; dechlorinate the solution via palladium catalysis to convert the short chain chlorinated paraffins into a C10~C13 n-alkane, then inspect it with gas chromatograph which is equipped with a flame ionization detector (GC-FID), and then quantify it by external standard method using the short chain chlorinated paraffin standards with the chlorine content of 55.5% (mass fraction). Where necessary, gas chromatographs equipped with electron capture detector (GC-ECD) or gas chromatograph-mass spectrometer with negative chemical ionization (GC-NCI-MS) shall be used for qualitative confirmation.
4 Reagents and materials
GB/T 38268-2019 The following standards are cited：
