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GB/T 6702-2022 English PDF

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GB/T 6702-2022: Naphthalene sulphuric acid test
Status: Valid

GB/T 6702: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 6702-2022English119 Add to Cart 3 days [Need to translate] Naphthalene sulphuric acid test Valid GB/T 6702-2022
GB/T 6702-2000English199 Add to Cart 2 days [Need to translate] Naphthalene sulphuric acid test Obsolete GB/T 6702-2000
GB/T 6702-1986EnglishRFQ ASK 3 days [Need to translate] Naphthalene sulphuric acid test Obsolete GB/T 6702-1986

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Basic data

Standard ID GB/T 6702-2022 (GB/T6702-2022)
Description (Translated English) Naphthalene sulphuric acid test
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard G18
Word Count Estimation 5,586
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 6702-2022: Naphthalene sulphuric acid test

---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.
Naphthalene sulphuric acid test ICS 71.080 CCSG18 National Standards of People's Republic of China Replacing GB/T 6702-2000 Naphthalene acid wash colorimetric test method Published on 2022-07-11 2022-11-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration

foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" drafted. This document replaces GB/T 6702-2000 "Naphthalene acid wash colorimetric test method", compared with GB/T 6702-2000, except for structural adjustment and In addition to editorial changes, the main technical changes are as follows. a) Modified normative references (see Chapter 2, Chapter 2 of the.2000 edition); b) Changed the reagents (see 5.1, 4.1 of the.2000 edition); c) Changed the requirements for colorimetric tubes (see 5.3, 6.1, 4.3, 5.1 of the.2000 edition); d) The requirements for balances have been changed (see 6.6, 5.6 of the.2000 edition); e) The sampling method and preparation content of the sample have been changed (see Chapter 7, Chapter 6 of the.2000 edition); f) Added the test report chapter (see Chapter 11). Please note that some content of this document may be patented. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed by China Iron and Steel Association. This document is under the jurisdiction of the National Standardization Technical Committee of Coal Chemical Industry (SAC/TC469). This document is drafted by. Shandong Chenyang New Carbon Materials Co., Ltd., Zhangjiagang Tengxiang Machinery Manufacturing Co., Ltd., Metallurgical Industry Information Standards Institute. The main drafters of this document. Yan Guilin, Yan Ping, Zhang Haixia, Zhao Weiliang, Shen Yanjun, Zhu Weisu, Wang Xiaoyuan. This document was first published in 1986, revised for the first time in.2000, and this is the second revision. Naphthalene acid wash colorimetric test method Caution - Persons using this document should have practical experience in formal laboratory work. This document does not address all possible security issues question. It is the user's responsibility to take appropriate safety and health measures and to ensure compliance with the conditions stipulated by relevant national regulations.

1 Scope

This document specifies the reagents and solutions, instruments and equipment, sample collection and preparation, test procedures, test test results, tolerances and test reports. This document applies to the colorimetric test of coking naphthalene pickling extracted from coal tar.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document. GB/T 1999 Sampling method for coking oil products GB/T 2000 Sampling method for coking solid products GB/T 6682 Analysis Laboratory Water Specifications and Test Methods

3 Terms and Definitions

There are no terms and definitions that need to be defined in this document.

4 Principles

Compare the color produced by the reaction of the sample in concentrated sulfuric acid with the color of the standard colorimetric solution to determine the colorimetric number.

5 Reagents and Solutions

5.1 Reagents Unless otherwise specified, only the reagents confirmed to be analytically pure are used in the analysis, and the water used shall meet the requirements of grade 3 and above in GB/T 6682 Do not ask for water. 5.1.1 Cobalt chloride (CoCl2·6H2O). 5.1.2 Ferric chloride (FeCl3 6H2O). 5.1.3 Copper sulfate (CuSO4·5H2O). 5.1.4 Hydrochloric acid, ρ≈1.19g/mL. 5.1.5 Sulfuric acid. excellent grade pure, ρ≈1.84g/mL. 5.2 Stock solutions 5.2.1 Preparation of 1% (mass fraction) hydrochloric acid solution. Measure 23.6 mL of hydrochloric acid (5.1.4) in a 1000 mL volumetric flask, add water to dilute to

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