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| GB/T 14327-2025 | English | 209 |
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Determination of thiophene content in benzene
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GB/T 14327-2025
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| GB/T 14327-2009 | English | 149 |
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Determination of thiophene content in benzene
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GB/T 14327-2009
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| GB/T 14327-1993 | English | 199 |
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Determination of thiophene content in benzene
| Obsolete |
GB/T 14327-1993
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Standard similar to GB/T 14327-2025 GB/T 14327 GB/T 50034 GB/T 50082 Basic data | Standard ID | GB/T 14327-2025 (GB/T14327-2025) | | Description (Translated English) | Determination of thiophene content in benzene | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G16 | | Classification of International Standard | 71.080 | | Word Count Estimation | 10,172 | | Date of Issue | 2025-10-05 | | Date of Implementation | 2026-05-01 | | Older Standard (superseded by this standard) | GB/T 14327-2009 | | Issuing agency(ies) | State Administration for Market Regulation and Standardization Administration of China | GB/T 14327-2025: Determination of thiophene content in benzene---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.
ICS 71.080
CCSG16
National Standards of the People's Republic of China
Replaces GB/T 14327-2009
Method for determining thiophene content in benzene
Published on 2025-10-05
Implemented on May 1, 2026
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
This document replaces GB/T 14327-2009 "Determination of Thiophene Content in Benzene". Compared with GB/T 14327-2009, except for the structure...
Aside from adjustments and editorial changes, the main technical changes are as follows.
a) The scope has been changed (see Chapter 1, Chapter 1 of the.2009 edition);
b) The principle of spectrophotometry has been modified (see 5.1, Chapter 3 of the.2009 edition);
c) The reagents and materials in the spectrophotometry method have been changed, and the requirements for water have been added (see 5.2, Chapter 4 of the.2009 edition);
d) The experimental procedures for spectrophotometry have been modified (see 5.4, Chapter 8 of the.2009 edition);
e) Added requirements for calculating spectrophotometric results (see 5.5);
f) Added Method 2 [Gas Chromatography (Arbitration Method)] (see Chapter 6);
g) Additional test report requirements have been added (see Chapter 7).
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed by the China Iron and Steel Association.
This document is under the jurisdiction of the National Technical Committee on Standardization of Coal Chemical Industry (SAC/TC469).
This document was drafted by. Ansteel Co., Ltd., Inner Mongolia Huineng Chemical Co., Ltd., Metallurgical Industry Information and Standardization Research Institute, and Wuhan University of Science and Technology.
Technical University.
The main drafters of this document are. Li Yuanyuan, Lü Ming, Yu Yongzhi, Yang Ying, Wang Xiaoyuan, Lai Wei, Li Jianpeng, Zhang Xin, Gao Mingli, and Fang Hongming.
This document was first published in.1993, revised for the first time in.2009, and this is the second revision.
Method for determining thiophene content in benzene
Warning---The test methods described in this document require the use of some hazardous reagents and experimental instruments, and some procedures also involve certain risks.
Due to the inherent dangers, it is impossible to specify all safe usage methods; users are responsible for taking appropriate safety and health precautions.
Ensure compliance with the conditions stipulated by relevant national laws and regulations.
1 Scope
This document specifies the sampling, reagents and materials, instruments and equipment, test procedures, result calculation, and precision of the method for determining the thiophene content in benzene.
And test reports.
This document applies to the determination of thiophene content in coking benzene, coking toluene, coking xylene, and intermediate products. Method 1 (Spectrophotometry)
Method 1 (Gas Chromatography). Determination range. 0.1 mg/kg to 10 mg/kg; Method 2 (Gas Chromatography). Determination range. 0.05 mg/kg to 10 mg/kg, subject to modification.
The range of measurements can be expanded by adjusting the injection volume and split ratio.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 1999 Sampling Method for Coking Oil Products
GB/T 6682 Specifications and test methods for water used in analytical laboratories
GB/T 8170 Rules for rounding off numerical values and the representation and determination of limiting values
GB/T 9977 Terminology for Coking Products
GB/T 12806 Laboratory Glassware - Single-mark volumetric flasks
GB/T 12807 Graduated Pipettes for Laboratory Glassware
GB/T 12808 Laboratory Glassware - Single-mark Pipettes
3 Terms and Definitions
The terms and definitions defined in GB/T 9977 apply to this document.
4.Sampling
Proceed in accordance with GB/T 1999.
5.Method 1 (Spectrophotometry)
5.1 Principle
In the presence of sulfuric acid, thiophene reacts with indolequinone to form indothiophene, which turns purple in the presence of the oxidizing agent ferric sulfate. The color intensity varies depending on the degree of color change.
The trace thiophene content in the sample was determined by spectrophotometry.
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GB/T 14327-2025: Determination of thiophene content in benzene
Status: Valid
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