GB/T 31531-2025: Determination of quinoline and isoquinoline in dyestuffs and textile dyeing and finishing auxiliaries

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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)

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Older Standard (superseded by this standard)	GB/T 31531-2015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