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GB/T 12688.4-2011 English PDF

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Q: Should I purchase the latest version GB/T 12688.4-2011?

Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 12688.4-2011 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.

US$169.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 12688.4-2011: Test method of styrene for industrial use -- Part 4: Determination of content of peroxides -- Titrimetric method
Status: Valid

GB/T 12688.4: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 12688.4-2011	169	Add to Cart	3 days	Test method of styrene for industrial use -- Part 4: Determination of content of peroxides -- Titrimetric method	Valid
GB/T 12688.4-1990	199	Add to Cart	2 days	Styrene for industrial use--Determination of content of peroxides--Titrimetric method	Obsolete

Similar standards

GB/T 14571.3 GB/T 14571.4 GB/T 14571.2 GB/T 12688.10 GB/T 12688.5 GB/T 12688.1

Basic data

Standard ID: GB/T 12688.4-2011 (GB/T12688.4-2011)
Description (Translated English): Test method of styrene for industrial use -- Part 4: Determination of content of peroxides -- Titrimetric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G16
Classification of International Standard: 71.080.15
Word Count Estimation: 7,771
Date of Issue: 2011-05-12
Date of Implementation: 2011-11-01
Older Standard (superseded by this standard): GB/T 12688.4-1990
Quoted Standard: GB/T 601; GB/T 3723; GB/T 6680; GB/T 6682; GB/T 8170
Adopted Standard: ASTM D2340-2009, 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 method for determination of peroxides.

GB/T 12688.4-2011: Test method of styrene for industrial use -- Part 4: Determination of content of peroxides -- Titrimetric 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.
Test method of styrene for industrial use Part 4. Determination of content of peroxides Titrimetric method. ICS 71.080.15 G16 National Standards of People's Republic of China Replacing GB/T 12688.4-1990 Styrene Test Method for industrial use Determination of the peroxide content. Part 4 titration Part 4. Determinationofcontentofperoxides- 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 Part of 412,688. The partial modification using ASTMD2340-09 "Standard Test Method for styrene monomer content of peroxides" (in English). Headquarters Structural differences and points of ASTMD2340-09 see Appendix A. This section compared with ASTMD2340-09 main technical changes as follows. --- Remove restrictions peroxide measurement range; --- Normative references cited in our standards. This Part replaces GB/T 12688.4-1990 "peroxide for industrial use - Determination of titration." This portion of the GB/T 12688.4-1990 The main differences are as follows. --- Modify the standard name; --- Added Appendix A. 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 12688.4-1990. Styrene Test Method for industrial use Determination of the peroxide content. Part 4 titration

1 Scope

This section provides for industrial use Determination of styrene peroxide content. This section is not intended to illustrate its use of all safety-related issues. Responsibility of the user to establish appropriate safety and health measures Facilities, to ensure compliance 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 concentration Its 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 601 chemical reagent titration analysis (volumetric analysis) Preparation of standard solutions 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

Styrene and samples to an acetic acid solution of isopropanol, then isopropanol was added a saturated solution of sodium iodide and heated under reflux. Sample peroxide The reaction with sodium iodide compound quantitatively released iodine with sodium thiosulfate standard titration solution titrated to colorless as the end point, in accordance with standard sodium thiosulfate Consumption volume calculations quasi titration solution obtained peroxide 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 glacial acetic acid. 4.2 isopropanol. NOTE. Isopropyl alcohol is flammable, away from open flame. In this test should be used fully sealed heater. 4.3 sodium thiosulfate standard titration solution [c (Na2S2O3) = 0.01mol/L]. formulated and calibrated according to the provisions of GB/T 601, so Diluted before use. Isopropanol saturated solution of sodium iodide, 4.4. about 200g/L. 5. Apparatus 5.1 electric heater (fully enclosed). 5.2 iodine bottle stopper. 500mL, with 300mm spherical condenser, standard ground joint. ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 12688.4-2011_English be delivered?

Answer: Upon your order, we will start to translate GB/T 12688.4-2011_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 12688.4-2011_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 12688.4-2011_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version GB/T 12688.4-2011?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 12688.4-2011 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.