GB/T 12688.9-2011Test method of styrene for industrial use -- Part 9: Determination of trace benzene -- Gas chromatographic method (English PDF)

Foreword

GB/T 12688 "for industrial use - Test methods" is divided into the following sections.

--- Part 1. purity and hydrocarbon impurities - Gas chromatographic method;

--- Part 3. Determination of polymer content;

--- Part 4. Determination of the peroxide titration;

--- Part 5. Determination of total aldehyde titration;

--- Part 6. for industrial use - Determination of trace sulfur - Oxidative Microcoulometry;

--- Part 8. polymerization inhibitor (p - tert butyl catechol) determination of spectrophotometry;

--- Part 9. Trace Benzene by Gas Chromatography.

This section GB/T 12688 Part 9.

The partial modification (in English) "Standard Test Method for Trace Benzene hydrocarbon solvent by gas chromatography" With ASTMD6229-06, Part Structural differences and points of ASTMD6229-06 see Appendix A.

This section compared with ASTMD6229-06 main technical changes as follows.

--- Detection range was adjusted to 0.2mg/kg ~ 100mg/kg;

--- Increased capillary flow control system;

--- Repeatability limit use of the provisions;

--- Normative references cited in our standards.

Appendix A of this section is an informative annex.

This part is proposed by the China Petroleum and Chemical Corporation.

This part of the National Standardization Technical Committee Petrochemical Chemical Technical Committee (SAC/TC63/SC4) centralized.

This section drafted by. China Petroleum & Chemical Corporation Shanghai Research Institute of Petrochemical.

1 Scope

This section provides the determination of trace amounts of benzene styrene industrial gas chromatography.

This section applies to industrial use Determination of styrene content in the range of 0.2mg/kg ~ 100mg/kg of benzene.

This section is not intended to illustrate the safety problems associated with its use, the user has the responsibility to take appropriate safety and health practices and security Certified to comply with the provisions of the relevant national regulations.

Note. Styrene monomer is flammable. When in contact with peroxide, an inorganic acid and aluminum chloride exothermic polymerization reaction occurs. high its concentration liquid styrene vapor on the eyes and respiratory system irritation there.

2 Normative references

The following documents contain provisions which, through reference GB/T 12688 in this section constitute provisions of this section. For dated reference documents Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section.

GB/T 3723 Sampling of chemical products for industrial use General Safety (GB/T 3723-1999, ISO 3165. 1976, idt) GB/T 6680 General rules for sampling liquid chemical products GB/T 8170 repair value expressed about the rules and limit values \u200b\u200band judgment

3 PRINCIPLE OF THE METHOD

4 Reagents and materials

4.1 Carrier gas. nitrogen, purity (volume fraction) >=99.995%, silica gel and molecular sieve 5A dried, purified.

4.2 Combustion gas (FID). hydrogen, purity (volume fraction) >=99.99%.

4.3 assisting gas. air, oil, silica gel and molecular sieve 5A dried, purified.

4.4 Benzene. purity (mass fraction) of not less than 99.5%.

4.5 Styrene. purity (mass fraction) of not less than 99.7%, no benzene.

4.6 n-heptane. purity (mass fraction) of not less than 99%.