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GB/T 12688.3-2011: Test method of styrene for industrial use -- Part 3: Determination of content of polymer
Status: Valid GB/T 12688.3: Evolution and historical versions
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| GB/T 12688.3-2011 | English | 169 |
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Test method of styrene for industrial use -- Part 3: Determination of content of polymer
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GB/T 12688.3-2011
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| GB/T 12688.3-1990 | English | 199 |
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Styrene for industrial use--Determination of content of polymer--Photometric method
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GB/T 12688.3-1990
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Basic data | Standard ID | GB/T 12688.3-2011 (GB/T12688.3-2011) | | Description (Translated English) | Test method of styrene for industrial use -- Part 3: Determination of content of polymer | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G16 | | Classification of International Standard | 71.080.15 | | Word Count Estimation | 7,794 | | Date of Issue | 2011-05-12 | | Date of Implementation | 2011-11-01 | | Older Standard (superseded by this standard) | GB/T 12688.3-1990 | | Quoted Standard | GB/T 3723; GB/T 6680; GB/T 6682; GB/T 8170 | | Adopted Standard | ASTM D2121-2007, MOD | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 6 of 2011 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the industrial styrene polymer content determination. This section applies to polymer content Photometric range 1mg/kg-15mg/kg styrene samples were determined. If the polymer content in the sample is greater than 15mg/kg, it should be diluted before the measurement. This part of the visual method is suitable for polymer content (mass fraction) of not more than 1. 0% of the styrene samples were determined. Samples polymer content (mass fraction) is greater than 1. 0% should be fixed before the side appropriate dilution. This section does not apply to industrial use styrene dimers and trimers of testing. | GB/T 12688.3-2011: Test method of styrene for industrial use -- Part 3: Determination of content of polymer
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Test method of styrene for industrial use Part 3. Determination of content of polymer
ICS 71.080.15
G16
National Standards of People's Republic of China
Replacing GB/T 12688.3-1990
Styrene Test Method for industrial use
Part 3. Determination of polymer content
Part 3. Determinationofcontentofpolymer
Issued on. 2011-05-12
2011-11-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
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 3.
The partial modification using ASTMD2121-07 "Standard Test Method for styrene monomer in the polymer content" (in English). This section
And structural differences ASTMD2121-07 in Appendix A.
This section compared with ASTMD2121-07 main technical changes as follows.
--- Normative references cited in our standards;
--- On the acceptance of high-purity polystyrene particles were prescribed;
--- Removed from the standard curve plotted in the 25 ℃ temperature requirements.
This Part replaces GB/T 12688.3-1990 "for industrial use - spectrophotometric determination of polymer content."
This portion of the GB/T 12688.3-1990 The main differences are as follows.
--- Changing the name of the standard;
--- Spectrophotometric measurement range is changed to 1mg/kg ~ 15mg/kg;
--- Increased high-purity polystyrene particles polystyrene standard stock solution preparation methods;
--- Increased visually;
--- Removed from the standard curve plotted in the 25 ℃ temperature requirements.
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 and Chemical Corporation Beijing Yanshan Company.
The main drafters of this section. Yang Wei, Lu Huili, Jiang Liancheng, Tian Jiangnan, Li Xiangyang.
This part of the standard replaces the previous editions are.
--- GB/T 12688.3-1990.
Styrene Test Method for industrial use
Part 3. Determination of polymer content
1 Scope
This section provides an industrial process measurement styrene polymer content.
Spectrophotometry in this section applies to the polymer content in the range of 1mg/15mg/kg ~ kg of styrene measured sample. Polymerization Samples
When the content if more than 15mg/kg, should be suitably diluted before the assay.
This method is suitable for the visual part of the polymer content (mass fraction) of not more than 1.0% of styrene measured sample. Samples containing polymers
The amount (mass fraction) is greater than 1.0%, it should be appropriately diluted before measurement.
This section does not apply to industrial use in the detection of styrene dimers and trimers.
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 as flammable, exothermic polymerization reaction occurs when contact with peroxide, an inorganic acid and aluminum chloride and the like. High concentrations of liquid styrene and
Its 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 6682 analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD)
GB/T 8170 repair value expressed about the rules and limit values \u200b\u200band judgment
3 PRINCIPLE OF THE METHOD
3.1 spectrophotometry
Use of a styrene polymer present in the styrene monomer insoluble in principle methanol, was added anhydrous methanol in the sample of styrene, in
Absorbance was measured at 420nm, and quantitative calibration curves were compared to determine the content of the polymer.
3.2 visually
Added styrene sample of anhydrous methanol by visually observing the turbidity of the solution and the standard solution were determined by comparing the polymer
content.
4 Reagents and materials
Unless otherwise indicated, the reagents used in this section should be of analytical grade. The water should meet the three water specifications GB/T 6682 regulations.
4.1 n-hexane.
4.2 anhydrous methanol.
4.3 toluene.
4.4 Sodium hydroxide solution. 40g/L.
4.5 Styrene. purity (mass fraction) ≥99.6%.
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