Standard No.:	GB/T 31531-2025
English Name:	Determination of quinoline and isoquinoline in dyestuffs and textile dyeing and finishing auxiliaries
Chinese Name:	染料及纺织染整助剂产品中喹啉及异喹啉的测定
Chinese Classification:	G55    Basic standards and general methods for dye
Professional Classification:	GB    National Standard
Source Content Issued by:	SAMR; SAC
Issued on:	2025-08-29
Implemented on:	2026-3-1
Status:	to be valid
Superseding:	GB/T 31531-2015 Determination of quinoline in dyestuffs and textile dyeing and finishing auxiliaries
Target Language:	English
File Format:	PDF
Word Count:	5000 words
Translation Price(USD):	150.0
Delivery:	via email in 1 business day

GB/T 31531-2025 Determination of quinolone and isoquinoline in dyestuffs and textile dyeing and finishing auxiliaries WARNING——Persons using this document shall be familiar with normal laboratory practice. This document does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions. 1 Scope This document specifies the determination method of the content of free quinoline and isoquinoline in dyestuffs and textile dyeing and finishing auxiliaries. This document is applicable for the determination of the content of free quinoline and isoquinoline in various dyestuffs, dyestuff 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 (as per the international relative atomic mass in 2022) 2 Normative references The following documents contain provisions which, through reference in this text, constitute provisions 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 & expression and judgement of limiting values GB/T 9722-2023 Chemical reagent - General rules for the gas chromatography 3 Terms and definitions No terms and definitions are listed in this document.

Contents Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Test methods 5 Minimum limit of quantification, recovery rate and precision 6 Test report