SN/T 1045.3-2010Determination of banned azo colourants in dyed textiles and leather products for import and export. Part 3: Gas chromatography method (English PDF)

Foreword

SN/T 1045 "Importers dyed textiles and leather products - Determination of banned azo" is divided into three parts.

--- Part 1. liquid chromatography;

--- Part 2. Gas chromatography/mass spectrometry;

--- Part 3. Gas Chromatography.

This section SN/T 1045 Part 3.

This part is the SN/T 1045.3-2002 "Importers dyed textiles and leather products banned azo gas test method Phase chromatography revised law ".

This section compared with the SN/T 1045.3-2002, the main differences are as follows.

--- Increasing the types of detectable aromatic amines, can detect 23 kinds of aromatic amines. The increase is three kinds.

(1) 2,4-dimethylaniline (2,4-Xylidine);

(2) 2,6-dimethylaniline (2,6-Xylidine);

--- Extraction solvent ether to methyl tert-butyl ether;

--- Reagent eleven to eleven tungsten potassium silicate sodium silicate;

--- Final volume is defined as 2mL solvent methyl t-butyl ether.

This section Purifying Unlike other standards or methods when using other standards or test results obtained by the method has a strong matrix interference, no when the method is accurate qualitative and quantitative, it recommended adopting the standard method.

This section in Appendix A, Appendix D is a normative appendix, Appendix B and Appendix D is an informative annex.

This section proposed and managed by the National Certification and Accreditation Administration Committee.

1 Scope

SN/T 1045 provisions of this part of the dyed textiles and leather products 23 kinds of banned aromatic amines (see Appendix A) content of gas chromatography Spectrum detection method.

This section applies to import and export textile dyeing (including cotton, hemp, silk, wool and chemical fiber) and dyed leather 23 kinds of banned aromatic amines Detection.

2 Normative references

The following documents contain provisions which, through reference SN/T 1045 and become part of the provisions of this section. For dated references, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encourage the agreement on this section Whether the parties can study the latest versions of these documents. For undated reference documents, the latest versions apply to this section.

Laboratory use specifications and test methods GB/T 6682 Analysis SN/T 1045.1 Importers dyed textiles and leather products - Determination of banned azo Part 1. liquid chromatography SN/T 1045.2 Importers dyed textiles and leather products banned azo - Part 2. Gas chromatography/mass Spectroscopy Principle 3 in citrate buffer (pH = 6.0) in the sample is reduced azo dyes sodium dithionite to the corresponding aromatic amine intermediate.

With methyl tert-butyl ether - methylene chloride solution in a mixed solvent extraction of aromatic amines. Extract aromatic amine with hydrochloric acid and sodium tungstate eleven After the solution was acidified to a salt concentration, the residue was washed with an organic solvent. After alkalizing to free the aromatic amine was extracted with methyl tert-butyl ether and dilute with Analysis for Gas Chromatography.

4 Reagents

Unless otherwise specified, the reagents were of analytical grade, water use in line with two water GB/T 6682 regulations.

4.1 hexane. chromatographically pure.

4.2 methyl tert-butyl ether. chromatography (CAS Number. 1634-04-4).

4.3 dichloromethane. chromatography.

4.4 Nitrogen. more than 99.99% purity.

4.5 hydrochloric acid solution. 1mol/L.

4.6 hydrochloric acid solution. 4mol/L.

4.7 Sodium hydroxide solution. 5mol/L.

4.8 citrate buffer solution. 0.06mol/L, pH = 6.0. Citric acid and sodium hydroxide weighed 12.526g 6.320g, dissolved 1000mL water.

4.9 dithionite solution.200mg/mL, the time is now equipped with.

4.10 Extraction solvent. methyl tert-butyl ether (4.2) and 3 parts of dichloromethane (4.3) 1 shake mix.

4.11 eleven tungsten silicate (Na8SiW11O39 · nH2O). homemade. The 91g of sodium tungstate (Na2WO4 · 2H2O) and 7.37g silicic acid