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GB/T 12688.8-2011 English PDF

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Q: Should I purchase the latest version GB/T 12688.8-2011?

Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 12688.8-2011 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 12688.8-2011: Test method of styrene for industrial use -- Part 8: Determination of content of inhibitor (p-tert-butylcatechol) -- Spectrophotometric method
Status: Valid

GB/T 12688.8: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 12688.8-2011	169	Add to Cart	3 days	Test method of styrene for industrial use -- Part 8: Determination of content of inhibitor (p-tert-butylcatechol) -- Spectrophotometric method	Valid
GB/T 12688.8-1998	239	Add to Cart	3 days	Styrene for industrial use--Determination of content of inhibitor (p-tert-butylcatechol)--Spectrophotometric 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 12688.8-2011 (GB/T12688.8-2011)
Description (Translated English): Test method of styrene for industrial use -- Part 8: Determination of content of inhibitor (p-tert-butylcatechol) -- Spectrophotometric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G16
Classification of International Standard: 71.080.15
Word Count Estimation: 7,781
Date of Issue: 2011-05-12
Date of Implementation: 2011-11-01
Older Standard (superseded by this standard): GB/T 12688.8-1998
Quoted Standard: GB/T 3723; GB/T 6680; GB/T 6682; GB/T 8170
Adopted Standard: ASTM D4590-2009, 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 use of styrene in the right tert-butyl catechol (TBC) method for determination. This section applies to industrial styrene content TBC side fixed, its scope is 1mg/kg-100mg/kg.

GB/T 12688.8-2011: Test method of styrene for industrial use -- Part 8: Determination of content of inhibitor (p-tert-butylcatechol) -- Spectrophotometric 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 8. Determination of content of inhibitor (p-tert-butylcatechol) Spectrophotometric method ICS 71.080.15 G16 National Standards of People's Republic of China Replacing GB/T 12688.8-1998 Styrene Test Method for industrial use Part 8. polymerization inhibitor (p - tert butyl catechol) Determination of spectrophotometry Part 8. Determinationofcontentofinhibitor (p-tert-butylcatechol) - 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 8. The partial modification using ASTMD4590-09 "spectrophotometer styrene monomer or α- methyl styrene p - tert-butyl-o-phenylenediamine Standard Test Method two phenol content "(in English), the structural difference between this part and ASTMD4590-09 in Appendix A. This section compared with ASTMD4590-09 main technical changes as follows. --- Normative references cited in our standards; --- Repeatability limit use of the provisions. This Part replaces GB/T 12688.8-1998 "industrial styrene polymerization inhibitor (p - tert-butyl catechol) Determination of spectral Spectrophotometry. " This portion of the GB/T 12688.8-1998 The main differences are as follows. --- Changing the name of the standard; --- Revised to - tert-butyl catechol measurement range; --- Modified preparation methods and the shelf life of an alcoholic solution of sodium hydroxide; --- Modify the sample and reagent consumption; --- Modify the determination of standard curve drawing and sample reference solution; --- Note 7.1.2 amended; --- Increasing the density measurement results is calculated correction. 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, Li Xiangyang, Li Xiaoyan, Zhang Kun. This part of the standard replaces the previous editions are. --- GB/T 12688.8-1998. Styrene Test Method for industrial use Part 8. polymerization inhibitor (p - tert butyl catechol) Determination of spectrophotometry

1 Scope

This section provides for industrial use styrene - Determination of tert-butyl catechol (TBC) content. This section applies to industrial use - Determination of TBC, its scope of 1mg/kg ~ 100mg/kg. Any other compounds containing styrene can generate color and alcohol solution of sodium hydroxide, were measured for interference. But if it is known The compound and its concentration in the sample, perhaps join this compound in the preparation of standard solutions and be compensated. 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 flammable. When in contact with peroxide, an inorganic acid and aluminum chloride exothermic polymerization reaction occurs. 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 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

Sodium hydroxide was added to the alcohol solution styrene sample, resulting in pink. Measuring the absorbance at 490nm with a spectrophotometer, And with the calibration curve of the determined content of the polymerization inhibitor.

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 pairs - tert-butyl catechol (TBC). content greater than 99%, a melting point of 52 ℃ ~ 55 ℃. 4.2 toluene. 4.3 methanol. 4.4 Sodium hydroxide solution. approximately 10mol/L, 4g of sodium hydroxide was dissolved in 10mL water. 4.5 n-octanol. 4.6 Sodium hydroxide alcohol solution. about 0.15mol/L. 0.75mL amount of sodium hydroxide solution was placed in 25mL of methanol, stirred and maintained Added 0.75mL 25mL n-octanol and water. Solution is stored in a brown bottle, this solution can be used immediately, storage period of two months. To reduce This solution was contacted with air, the solution was dispensed in to clean several small vial. 4.7 TBC stock solution. Weigh 0.500gTBC dissolved in 499.5g of toluene. The solution containing 1000mg/kg of TBC. Storage ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 12688.8-2011_English be delivered?

Answer: Upon your order, we will start to translate GB/T 12688.8-2011_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 12688.8-2011_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 12688.8-2011_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 12688.8-2011?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 12688.8-2011 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.