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GB/T 31531-2025: Determination of quinoline and isoquinoline in dyestuffs and textile dyeing and finishing auxiliaries
Status: Valid GB/T 31531: Evolution and historical versions
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| GB/T 31531-2025 | English | 219 |
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Determination of quinoline and isoquinoline in dyestuffs and textile dyeing and finishing auxiliaries
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GB/T 31531-2025
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| GB/T 31531-2015 | English | 149 |
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Determination of quinoline in dyestuffs and textile dyeing and finishing auxiliaries
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GB/T 31531-2015
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Basic data | Standard ID | GB/T 31531-2025 (GB/T31531-2025) | | Description (Translated English) | Determination of quinoline and isoquinoline in dyestuffs and textile dyeing and finishing auxiliaries | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G55 | | Classification of International Standard | 71.100.01; 87.060.10 | | Word Count Estimation | 10,141 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 31531-2015 | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | GB/T 31531-2025: Determination of quinoline and isoquinoline in dyestuffs and textile dyeing and finishing auxiliaries
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT31531-2025
ICS 71.100.01;87.060.10
CCSG55
National Standard of the People's Republic of China
Replaces GB/T 31531-2015
Quinoline and
Determination of Isoquinoline
Implementation on March 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document replaces GB/T 31531-2015 "Determination of quinoline in dyes and textile dyeing and finishing auxiliaries" and is in compliance with GB/T 31531-2015
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) The scope of application of the standard has been changed (see Chapter 1, Chapter 1 of the.2015 edition);
b) Added the determination method for isoquinoline content (see Chapter 4);
c) The quinoline content has been changed (see 4.3.1, 3.3.1 of the.2015 edition);
d) The packing material of the capillary column has been changed (see 4.4.2, 3.4.3 of the.2015 edition);
e) The gas chromatography operating conditions have been changed (see 4.5, 3.5 of the.2015 edition);
f) The calculation formula has been changed (see 4.9, 3.9 of the.2015 edition);
g) The recovery rate of quinoline was changed (see 5.2, 4.2 of the.2015 edition);
h) The precision of quinoline was changed (see 5.3, 4.3 of the.2015 edition);
i) Improved the recovery and precision of isoquinoline (see Chapter 5).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Petroleum and Chemical Industry Federation.
This document is under the jurisdiction of the National Technical Committee on Standardization of Dyes (SAC/TC134).
This document was drafted by. Zhejiang Boao New Materials Co., Ltd., Shaoxing Demei New Materials Co., Ltd., Shenyang Shenyang Institute of Chemical Technology Testing Technology Co., Ltd.
Co., Ltd., Shenyang Research Institute of Chemical Industry Co., Ltd., Shenyang Chemical Testing Technology (Nantong) Co., Ltd., and Modern Textile Technology Innovation Center (Jianhu Laboratory).
The main drafters of this document are. Shen Jianming, Yang Hongfeng, Wang Ming, Li Jingyi, Qi Dongming, Chen Senyao, Zhu Song, Cui Zhihua, Xu Jianguo, and Yu Jianing.
This document was first published in.2015 and this is the first revision.
Quinoline and
Determination of Isoquinoline
Warning. Personnel using this document should have practical experience in regular laboratory work. This document does not address all possible safety issues.
The user is responsible for taking appropriate safety and health measures and ensuring that the conditions stipulated by relevant national laws and regulations are met.
1 Scope
This document describes the method for the determination of free quinoline and isoquinoline content in dyestuffs and textile dyeing and finishing auxiliaries.
This document is applicable to the determination of free quinoline and isoquinoline content in various dosage forms of dyes, dye products, and textile dyeing and finishing auxiliaries.
Molecular formula. C9H7N
Structural formula.
Quinoline
Isoquinoline
CAS No.. 91-22-5 (Quinoline) 119-65-3 (Isoquinoline)
Relative molecular mass. 129.16 (according to the 2022 international relative atomic mass)
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 6682-2008 Specifications and test methods for water used in analytical laboratories
GB/T 8170-2008 Rules for rounding off values and expression and determination of limit values
GB/T 9722-2023 General rules for gas chromatography of chemical reagents
3 Terms and Definitions
There are no terms or definitions that require definition in this document.
4 Test Methods
4.1 General Provisions
Unless otherwise specified, only reagents of analytical grade and grade 3 water specified in GB/T 6682-2008 shall be used.
The rounded value comparison method in 4.3.3 of GB/T 8170-2008 shall be used.
4.2 Principle
The sample was extracted with an organic solvent in an aqueous solution to extract free quinoline and isoquinoline. The peak surface
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