GB/T 28025-2011Determination of the residual chlorine in products with filling materials - Water extraction method (English PDF)
絮用纤维制品余氯测试方法 水萃取法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
October 31, 2011
Implementation date
February 1, 2012
Scope
GB/T 28025-2011 is the English-translated version of 絮用纤维制品余氯测试方法 水萃取法.
GB/T 28025-2011 is the Chinese standard "Determination of the residual chlorine in products with filling materials - Water extraction method". Its scope clause reads: This standard specifies the determination of water extraction with wadding in chlorine method.
This standard applies to products with wadding. Its clauses include terms and definitions; reagents.
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Document preview — GB/T 28025-2011
National Standard of the People's Republic of China
- ICS
- 59.080.99
- Classification
- W 59
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 5 Reagents
1 Scope
This standard specifies the determination of water extraction with wadding in chlorine method.
This standard applies to products with wadding.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
Laboratory use specifications and test methods GB/T 6682 Analysis
GB 18383 with wadding General technical requirements
3 Terms and Definitions
GB 18383 and defined by the following terms and definitions apply to this document.
3.1 Chlorine
Product chlorine residual sum.
Principle 4
With wadding extracted a certain time at 30 °C water bath after which the residual chlorine in the water can be extracted. Then the use of N, N- diethyl-p
Phenylenediamine (DPD) with free chlorine in water color and fast response nature of its content was determined by spectrophotometry.
5 Reagents
Unless otherwise indicated, the reagents used in the analysis were of analytical grade and water for the three water GB/T 6682 regulations.
5.1
sulfuric acid.
5.2
Anhydrous disodium hydrogen phosphate (Na2HPO4).
5.3
anhydrous potassium dihydrogen phosphate (KH2PO4).
5.4
disodium edetate (Na2-EDTA).
5.5 N, N- diethyl-p-phenylenediamine hydrochloride [H2N · C6H4 · N (C2H5) 2 · 2HCl].
5.6 N, N- diethyl-p-phenylenediamine sulfate [H2N · C6H4 · N (C2H5) 2 · H2SO4 · 5H2O].
5.7
potassium permanganate (KMnO4), pure class distinctions.
5.8
phosphate buffer solution (pH6.5). Weigh 12.00g of anhydrous disodium hydrogen phosphate (5.2), 23.00g of anhydrous potassium dihydrogen phosphate (5.3) and
0.40g disodium edetate (5.4), mixed successively dissolved and diluted to 500mL.
5.9 N, N- diethyl-p-phenylenediamine (DPD) solution (1g/L). amount of 1mL of sulfuric acid (5.1) slowly inject the right amount of water, cooling, shake
END: Draft Version (GB/T 28025-2011)
GB 18383-2025 | GB/T 35751-2017 | GB/T 33389-2016 | GB/T 26379-2026 | GB/T 28024-2011 | GB/T 28023-2011 |
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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