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GB/T 31531-2025 English PDF

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US$219.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 31531-2025: Determination of quinoline and isoquinoline in dyestuffs and textile dyeing and finishing auxiliaries
Status: Valid

GB/T 31531: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 31531-2025	219	Add to Cart	3 days	Determination of quinoline and isoquinoline in dyestuffs and textile dyeing and finishing auxiliaries	Valid
GB/T 31531-2015	149	Add to Cart	3 days	Determination of quinoline in dyestuffs and textile dyeing and finishing auxiliaries	Valid

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Older Standard (superseded by this standard): GB/T 31531-2015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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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 31531-2025_English be delivered?

Answer: Upon your order, we will start to translate GB/T 31531-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 31531-2025_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 31531-2025_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version GB/T 31531-2025?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 31531-2025 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.