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Determination of benzene, toluene, xylene and toluene diisocyanates in solvent coatings. Headspace-GC-MS method
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Basic data
| Standard ID | SN/T 2251-2009 (SN/T2251-2009) |
| Description (Translated English) | Determination of benzene, toluene, xylene and toluene diisocyanates in solvent coatings. Headspace-GC-MS method |
| Sector / Industry | Commodity Inspection Standard (Recommended) |
| Classification of Chinese Standard | G50 |
| Classification of International Standard | 87.040 |
| Word Count Estimation | 8,858 |
| Date of Issue | 2009-02-20 |
| Date of Implementation | 2009-09-01 |
| Quoted Standard | GB/T 12589 |
| Regulation (derived from) | 2009 No. 5 (total 113) Chinese industry standard filing Announcements |
| Issuing agency(ies) | General Administration of Customs |
| Summary | This standard specifies the solvent-based coatings benzene, toluene, xylene and toluene diisocyanate content of the pre-empty GC-MS detection method. This standard applies to solvent-based paints, benzene, toluene, xylene and toluene diisocyanate determination. |
SN/T 2251-2009: Determination of benzene, toluene, xylene and toluene diisocyanates in solvent coatings. Headspace-GC-MS method
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Determination of benzene, toluene, xylene and toluene diisocyanates in solvent coatings.Headspace-GC-MS method
Exit inspection and quarantine industry standard book People's Republic of China
Solvent-based paints of benzene, toluene, xylene, and toluene
Headspace isocyanate GC-MS method
Posted 2009-02-20
2009-09-01 implementation
People's Republic of China
The State Administration of Quality Supervision, Inspection and Quarantine released
Foreword
Appendix A of this standard is an informative annex.
This standard is proposed and managed by the National Certification and Accreditation Administration Committee.
This standard was drafted. People's Republic of China Guangdong CIQ.
The main drafters of this standard. ZHOU Ming-hui, Chen Qiang, Di Cuiping, Shaw before Liuying Feng, Zheng Jianguo, left flat, Xiao Dahui.
This standard is the first release of the entry-exit inspection and quarantine industry standards.
Solvent-based paints of benzene, toluene, xylene, and toluene
Headspace isocyanate GC-MS method
1 Scope
This standard specifies the headspace GC-MS detection method of solvent-based coatings as benzene, toluene, xylene, and toluene diisocyanate content.
This standard applies to the determination of solvent-based coatings benzene, toluene, xylene and toluene diisocyanate of.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
All amendments (not including errata content) or revisions do not apply to this standard, however, encourage an agreement in accordance with this standard
Whether the parties can study the latest versions of these documents. For undated reference documents, the latest versions apply to this
standard.
GB/T 12589 Chemicals ethyl acetate (GB/T 12589-2007, ISO 6353-3. 1987, NEQ)
Principle 3
Matrix matching manner, quantitative sample was dissolved in ethyl acetate. Using headspace - gas chromatography - mass spectrometry (hereinafter referred to as the top
Empty by GC-MS) analysis of a one-time detection of benzene, toluene, xylene, and toluene diisocyanate (TDI), internal standard.
4 Reagents and materials
Unless otherwise specified, use only analytical reagent.
Sieve 4.1. 5 (5 × 10-10m), the strip?.
4.2 ethyl acetate. involves determining the toluene diisocyanate with ethyl alcohol off dehydration basis having the following method. The molecular sieve 250g
(4.1) placed in a muffle furnace burning 500 ℃ 2h, until the furnace temperature dropped to below 100 ℃ removed, placed in a desiccator containing anhydrous silica gel cooling
After Pour freshly unsealed 500mL ethyl acetate, shake, standing 24h, then press method GB/T 12589 stipulated measured water
(Mass fraction < 0.03%), alcohol content (mass fraction < 0.02%).
4.3 Benzene. 99.5% purity.
Toluene 4.4. 99.5% purity.
4.5 o-xylene. purity 99.5%.
4.6 Xylene. purity of 99.5%.
4.7 pairs of p-xylene purity. 99.5% or more.
4.8 toluene diisocyanate (TDI). toluene-2,4-diisocyanate-based, containing a small amount of toluene-2,6-diisocyanate, isomers
And content ≥95.0%.
4.9 Internal standard. tetradecane, chromatography.
4.10 internal standard solution. Weigh accurately n-tetradecane standard sample 2.5g (accurate to 0.0002g), placed in 250mL flask with acetic
Ethyl dissolved constant volume. The solution containing n-tetradecane is 10.00g/L.
4.11 standard stock solution. Weigh accurately as benzene, toluene, xylene and toluene standard sample diisocyanate (TDI) of each 0.5g (accurate to
0.0002g), placed in 25mL volumetric flask, dissolved in ethyl acetate volume. The above solution containing the target compound were 20.00g/L.
5. Apparatus
5.1 Gas chromatography - mass spectrometry (GC-MS). Hotels with EI source.
...
