SN/T 2187-2008 English PDF

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
SN/T 2187-2008	359	Add to Cart	3 days	Determination of benzene, toluene, xylene and toluene diisocyanates in solvent coatings. Derivative reaction-gas chromatography method	Obsolete

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Basic data

Standard ID: SN/T 2187-2008 (SN/T2187-2008)
Description (Translated English): Determination of benzene, toluene, xylene and toluene diisocyanates in solvent coatings. Derivative reaction-gas chromatography method
Sector / Industry: Commodity Inspection Standard (Recommended)
Classification of Chinese Standard: G50
Word Count Estimation: 9,995
Date of Issue: 2008-11-18
Date of Implementation: 2009-06-01
Quoted Standard: GB/T 12589
Regulation (derived from): National Quality Inspection [2008] No. 577
Issuing agency(ies): General Administration of Customs
Summary: This standard specifies the solvent-based coatings benzene, toluene, xylene and toluene diisocyanate content derivatization Gas chromatographic method. This standard applies to solvent-based paints, benzene, toluene, xylene and toluene diisocyanate monomer determination.

SN/T 2187-2008: Determination of benzene, toluene, xylene and toluene diisocyanates in solvent coatings. Derivative reaction-gas chromatography method

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Determination of benzene, toluene, xylene and toluene diisocyanates in solvent coatings.Derivative reaction-gas chromatography method Exit inspection and quarantine industry standard book People's Republic of China Solvent-based coatings benzene, toluene, xylene And Determination of toluene diisocyanate Derivatization - gas chromatography Posted 2008-11-18 2009-06-01 implementation People's Republic of China The State Administration of Quality Supervision, Inspection and Quarantine released

Foreword

Appendix A of this standard and Appendix B 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 Fujian Exit Inspection and Quarantine. The main drafters of this standard. Liang Ming, Wengruo Rong, Jiang Xiaoli Tang Xi, Cai Chunping. This standard is the first release of the entry-exit inspection and quarantine industry standards. Solvent-based coatings benzene, toluene, xylene And Determination of toluene diisocyanate Derivatization - gas chromatography

1 Scope

This standard specifies the reaction solvent-based coatings derivative of benzene, toluene, xylene, and toluene diisocyanate content - Gas Chromatography method. This standard applies to the determination of solvent-based coatings benzene, toluene, xylene and toluene diisocyanate monomers.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether 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 Methanol was added and the use of toluene diisocyanate-derived reactive manner; heating applications, capillary column chromatography, a one-time analysis Detection of benzene, toluene, xylene and toluene diisocyanate (TDI), internal standard.

4 Reagents and materials

Unless otherwise specified, use only analytical reagent. 4.1 5A zeolite. 5A (5 × 10-10m), strip. 4.2 ethyl acetate. The 250g5A molecular sieve (4.1) placed in a muffle furnace burning 500 ℃ 2h, until the furnace temperature dropped to below 100 ℃ out, After containing anhydrous silica into the dryer to cool, pour just unsealed 500mL ethyl acetate, shake, standing 24h, then press The method GB/T 12589 stipulated measuring the water content (< 0.03%), alcohol content (< 0.02%). 4.3 Methanol. chromatographically pure. 4.4 Benzene. 99.5% purity. 4.5 toluene. known content, 99.5%. 4.6 xylene. known content, 99.5%. 4.7 Xylene. known content of 99.5%. 4.8 pairs of xylene. known content, 99.5%. 4.9 toluene diisocyanate (TDI). toluene-2,4-diisocyanate-based, containing a small amount of toluene-2,6-diisocyanate, isomers And 99.5%. 4.10 Internal standard. n-octane or n-tetradecane, chromatography. 4.11 Internal standard solution. Accurately weigh 2.0g (accurate to 0.2mg) of n-octane in 50mL volumetric flask, ethyl acetate (4.2) constant volume, with Set to 40mg/mL internal standard solution. 4.12 standard stock solution. Weigh accurately benzene (4.4), toluene (4.5) and xylene (4.6 to 4.8) for each standard 2.0g (accurate to 0.2mg), a 50mL volumetric flask, ethyl acetate (4.2) was dissolved constant volume. The solution containing the above are the concentration of each compound solution 40mg/mL. ......

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