GB/T 31531-2025 PDF English
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| GB/T 31531-2025 | English | 155 |
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Determination of quinoline and isoquinoline in dyestuffs and textile dyeing and finishing auxiliaries
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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 31531-2025: 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
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.01;87.060.10
CCS G 55
Replacing GB/T 31531-2015
Determination of quinoline and isoquinoline in dyestuffs and
textile dyeing and finishing auxiliaries
Issued on: AUGUST 29, 2025
Implemented on: MARCH 01, 2026
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Test methods... 6
5 Minimum quantification limit, recovery rate and precision... 8
6 Test Report... 9
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020
"Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents".
This document replaces GB/T 31531-2015 "Determination of quinoline in dyestuffs
and textile dyeing and finishing auxiliaries". Compared to GB/T 31531-2015, in
addition to structural adjustments and editorial changes, the main technical changes in
this document are as follows.
a) Changed the scope of application of the standard (see Chapter 1 of this Edition;
Chapter 1 of Edition 2015);
b) Added the method for determining the content of isoquinoline (see Chapter 4 of
this Edition);
c) Changed the content of quinoline (see 4.3.1 of this Edition; 3.3.1 of Edition 2015);
d) Changed the packing material for capillary columns (see 4.4.2 of this Edition;
3.4.3 of Edition 2015);
e) Changed the gas chromatography operating conditions (see 4.5 of this Edition;
3.5 of Edition 2015);
f) Changed the calculation formula (see 4.9 of this Edition; 3.9 of Edition 2015);
g) Changed the recovery of quinoline (see 5.2 of this Edition; 4.2 of Edition 2015);
h) Changed the precision of quinoline (see 5.3 of this Edition; 4.3 of Edition 2015);
i) Added the recovery of isoquinoline, precision (see Chapter 5 of this Edition).
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority shall not be held responsible for
identifying any or all such patent rights.
This document was proposed by China Petroleum and Chemical Industry Federation.
This document shall be under the jurisdiction of National Technical Committee on
Dyestuffs of Standardization Administration of China (SAC/TC 134).
The drafting organizations of this document. Zhejiang Boao New Materials Co., Ltd.,
Shaoxing Demei New Materials Co., Ltd., Shenyang Shenyang Institute of Chemical
Technology Testing Technology Co., Ltd., Shenyang Research Institute of Chemical
Industry Co., Ltd., Shenyang Shenyang Institute of Chemical Technology Testing
Determination of quinoline and isoquinoline in dyestuffs and
textile dyeing and finishing auxiliaries
WARNING -- Personnel using this document shall have practical experience in
formal laboratory work. This document does not address all possible safety issues.
Users are responsible for taking appropriate safety and health measures and
ensuring compliance with relevant national regulations.
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.
Relative molecular mass. 129.16 (according to the 2022 international relative atomic
mass)
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 6682-2008, Water for analytical laboratory use -- Specification and test
methods
GB/T 8170-2008, Rules of rounding off for numerical values and expression and
Quinoline Isoquinoline
(isoquinoline)(quinoline)
judgement of limiting values
GB/T 9722-2023, Chemical reagent - General rules for the gas chromatography
3 Terms and definitions
There are no terms or definitions that require definition in this document.
4 Test methods
4.1 General
Unless otherwise specified, only reagents that are confirmed as analytically pure and
Grade 3 water as specified in GB/T 6682-2008 shall be used. Test results shall be
determined using the rounded value comparison method described in 4.3.3 of GB/T
8170-2008.
4.2 Principle
The specimen is extracted with an organic solvent in an aqueous solution to remove
free quinoline and isoquinoline. Gas chromatography is used for analysis. Peak area is
quantified using an external standard method.
4.3 Reagents and materials
4.3.1 Quinoline. content ≥ 98% (mass fraction).
4.3.2 Isoquinoline. content ≥ 98% (mass fraction).
4.3.3 Ethyl acetate.
4.4 Instruments and equipment
4.4.1 Gas chromatograph. the performance and stability of the instrument shall comply
with the requirements of 6.2 and 6.4 of GB/T 9722-2023.
4.4.2 Capillary column. 30 m long, 0.32 mm inner diameter, 1.0 μm film thickness.
Stationary Phase. 5% phenyl-95% methylpolysiloxane, or other capillary column
capable of achieving equivalent separation performance.
4.4.3 Detector. flame ionization detector (FID).
4.4.4 Microsyringe or autosampler.
4.4.5 Chromatographic workstation or integrator.
4.5 Gas chromatography operating conditions
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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