GB/T 6702-2022Naphthalene sulphuric acid test (English PDF)
萘酸洗比色试验方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
July 11, 2022
Implementation date
November 1, 2022
Scope
GB/T 6702-2022 is the English-translated version of 萘酸洗比色试验方法.
GB/T 6702-2022 is the Chinese national acid-wash colour test for coking naphthalene. Clause 1 lists what it specifies: the reagents and solutions, the instruments and equipment, sample collection and preparation, the test procedure, the test result, the tolerances and the test report.
The colour the sample develops in concentrated sulfuric acid is compared with a standard colour solution to read off a colour number, and the reagent list runs to cobalt chloride, ferric chloride, copper sulfate, hydrochloric acid of about 1.19 g/mL and excellent-grade pure sulfuric acid of about 1.84 g/mL.
It applies to coking naphthalene extracted from coal tar, and among the standards it quotes are GB/T 1999, GB/T 2000 and GB/T 6682. It replaces GB/T 6702-2000, was issued on 11 July 2022 and has applied since 1 November 2022.
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Document preview — GB/T 6702-2022
National Standard of the People's Republic of China
- ICS
- 71.080
- Classification
- G 18
- Replacing
- GB/T 6702-2000
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Principles
- 5 Reagents and Solutions
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).
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, rho~1.19g/mL.
5.1.5 Sulfuric acid. excellent grade pure, rho~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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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Similar standards
Editions of GB/T 6702
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 6702-2022 | Naphthalene sulphuric acid test | current edition | Current |
| GB/T 6702-2000 | Naphthalene sulphuric acid test | previous edition | Superseded |
This page sells the current edition, GB/T 6702-2022. Earlier editions are listed for reference only.
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