Home   Cart   Quotation   Policy   About-Us
www.ChineseStandard.net
SEARCH

GB/T 31531-2025 PDF English

US$155.00 · In stock · Download in 9 seconds
GB/T 31531-2025: Determination of quinoline and isoquinoline in dyestuffs and textile dyeing and finishing auxiliaries
Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure
Status: Valid

GB/T 31531: Historical versions

Standard IDUSDBUY PDFDeliveryStandard Title (Description)Status
GB/T 31531-2025155 Add to Cart Auto, 9 seconds. Determination of quinoline and isoquinoline in dyestuffs and textile dyeing and finishing auxiliaries Valid
GB/T 31531-2015149 Add to Cart 3 days Determination of quinoline in dyestuffs and textile dyeing and finishing auxiliaries Valid

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.
Image 1     Image 2     Image 3     

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of English version of GB/T 31531-2025 be delivered?Answer: The full copy PDF of English version of GB/T 31531-2025 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.

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 paid 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. www.ChineseStandard.us -- GB/T 31531-2025 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.

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.

How to buy and download a true PDF of English version of GB/T 31531-2025?

A step-by-step guide to download PDF of GB/T 31531-2025_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "GB/T 31531-2025".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3    Steps 4~6    Step 7    Step 8    Step 9