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GB/T 21883-2025 English PDF

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GB/T 21883-2025: Fluorescent whitening agents - Determination of UV-absorption and fluoristrength
Status: Valid

GB/T 21883: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB/T 21883-2025	English	209	Add to Cart	3 days [Need to translate]	Fluorescent whitening agents - Determination of UV-absorption and fluoristrength	Valid	GB/T 21883-2025
GB/T 21883-2016	English	119	Add to Cart	3 days [Need to translate]	Fluorescent whitening agents -- Determination of fluoristrength	Valid	GB/T 21883-2016
GB/T 21883-2008	English	199	Add to Cart	2 days [Need to translate]	Fluorescent whitening agents -- Determination of fluoristrength	Obsolete	GB/T 21883-2008

Standard similar to GB/T 21883-2025

GB/T 21883 GB/T 50034 GB/T 50082

Basic data

Standard ID	GB/T 21883-2025 (GB/T21883-2025)
Description (Translated English)	Fluorescent whitening agents - Determination of UV-absorption and fluoristrength
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G55
Classification of International Standard	71.100.01; 87.060.10
Word Count Estimation	10,142
Date of Issue	2025-10-05
Date of Implementation	2026-05-01
Older Standard (superseded by this standard)	GB/T 21883-2016
Issuing agency(ies)	State Administration for Market Regulation and Standardization Administration of China

GB/T 21883-2025: Fluorescent whitening agents - Determination of UV-absorption and fluoristrength

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ICS 71.100.01;87.060.10 CCSG55 National Standards of the People's Republic of China Replaces GB/T 21883-2016 Determination of UV absorption and fluorescence intensity of fluorescent whitening agents Published on 2025-10-05 Implemented on May 1, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document replaces GB/T 21883-2016 "Determination of Fluorescence Intensity of Fluorescent Whitening Agents". Compared with GB/T 21883-2016, except for... Aside from structural adjustments and editorial changes, the main technical changes are as follows. a) The scope of the standard has been changed (see Chapter 1, Chapter 1 of the.2016 edition); b) Added terms and definitions (see Chapter 3); c) The principle of ultraviolet absorption has been added (see 4.2); d) Added content on reagents (see Chapter 5); e) The requirements for instruments and equipment have been changed (see Chapter 6, Chapter 4 of the.2016 edition); f) The general requirements for test specimens have been changed (see 7.1, 5.1 in the.2016 edition); g) Increased requirements for test temperature (see 7.3); h) The determination of ultraviolet absorption has been added (see 7.4.4.2 and 7.5.5.2); i) The calculation of ultraviolet absorption results has been added (see 7.6.2); j) Increased the allowable difference in UV absorption (see 7.7.2); k) The contents of the test report have been changed (see Chapter 8, Chapter 6 of the.2016 edition). Please note that some content in this document may involve patents. The issuing organization of this document assumes no 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. Inner Mongolia Xinmingyuan Technology Development Co., Ltd., Zhejiang Hongda Chemical Products Co., Ltd., and Zhejiang Chuanhua Huayang Chemical Co., Ltd. Shenyang Chemical Research Institute Testing Technology Co., Ltd., Shenyang Chemical Research Institute Co., Ltd., and Zhejiang Hongyi Chemical Co., Ltd. The main drafters of this document are. Rong Jianming, Li Jiang, Ma Yanli, Dong Zhongsheng, Ji Zhengfang, Gao Mengfei, Liu Xiaohui, Fan Yueming, and Yang Zhenmei. Feng Jianming. This document was first published in.2008, revised for the first time in.2016, and this is the second revision. Determination of UV absorption and fluorescence intensity of fluorescent whitening agents

1 Scope

This document describes the methods for determining the ultraviolet absorption and fluorescence intensity of fluorescent whitening agents. This document applies to the determination of UV absorption and fluorescence intensity of various types of fluorescent whitening agents (including water-soluble and water-insoluble ones).

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. GB/T 2374-2017 General conditions for dyeing determination GB/T 6682 Specifications and test methods for water used in analytical laboratories GB/T 6687 Dye Terminology GB/T 8170 Rules for rounding off numerical values and the representation and determination of limiting values

3 Terms and Definitions

The terms and definitions defined in GB/T 6687 apply to this document. 4.Principles 4.1 Fluorescence Intensity The fluorescent whitening agent sample and the standard were prepared into a solution of appropriate concentration under the same conditions, and the solution was analyzed using a UV spectrophotometer at the maximum absorption wavelength. The absorbance value was measured at the standard, and the fluorescence intensity of the sample relative to the standard was expressed as a percentage of the absorbance coefficient of the sample to that of the standard. 4.2 Ultraviolet Absorption The fluorescent whitening agent sample was prepared into a solution of appropriate concentration under certain conditions, and the concentration was measured at the maximum absorption wavelength using a UV spectrophotometer. The absorbance value was calculated and converted into the absorbance value of a cuvette with a mass concentration of 10 g/L and an optical path of 10 mm, i.e., ultraviolet absorption. 5.Reagents and Materials The reagents and materials used should conform to the specifications in Chapter 3 of GB/T 2374-2017. a) N,N-Dimethylformamide (DMF); b) Anhydrous sodium carbonate; c) Sodium hydroxide; d) Other solvents.

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