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GB/T 39109-2020: Textiles - Determination of Benzophenone Ultraviolet Absorbents Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 39109-2020: Textiles - Determination of Benzophenone Ultraviolet Absorbents---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/GBT39109-2020GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 59.080.01 W 04 Textiles - Determination of Benzophenone Ultraviolet Absorbents ISSUED ON: OCTOBER 21, 2020 IMPLEMENTED ON: MAY 1, 2021 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative References ... 4 3 Principle ... 4 4 Reagents ... 4 5 Equipment and Instruments ... 5 6 Analytical Procedures ... 5 7 Result Calculation and Expression ... 8 8 Lower Limit of Determination and Precision ... 8 9 Test Report ... 9 Appendix A (normative) Table of Information on 11 Kinds of Benzophenone Ultraviolet Absorbents ... 10 Appendix B (informative) HPLC/DAD Chromatograms of Benzophenone Ultraviolet Absorbents ... 13 Appendix C (informative) Spectrograms of Benzophenone Ultraviolet Absorbents ... 16 Textiles - Determination of Benzophenone Ultraviolet Absorbents WARNING---the personnel using this Standard shall have formal laboratory work experience. This Standard does not point out all the possible safety issues. The user is responsible for taking appropriate safety and health measures and ensuring compliance with the conditions stipulated by relevant national laws and regulations.1 ScopeThis Standard specifies a method for the determination of 11 kinds of benzophenone ultraviolet absorbents in textile products through high-performance liquid chromatograph - diode array detector (HPLC-DAD). This Standard is applicable to the determination of benzophenone ultraviolet absorbents in various types of textile products.2 Normative ReferencesThe following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods3 PrincipleUse methanol to ultrasonically extract the sample; use a filter membrane to filter and purify it. Then, use high-performance liquid chromatograph - diode array detector (HPLC-DAD) for determination and confirmation. Adopt the external standard method for quantification.4 Reagents4.1 Unless it is otherwise specified, all used reagents are analytically pure; water is Grade-1 water specified in GB/T 6682. 4.2 Methanol: chromatographically pure. 4.3 Isopropanol: chromatographically pure. 4.4 Formic acid: chromatographically pure. 4.5 Formic acid solution: 1 mL/L. Measure-take 1 mL of formic acid (4.4); use water to dissolve it and reach a constant volume of 1,000 mL, then, shake it well. 4.6 Methanol-isopropanol solution containing 1 mL/L formic acid (70 + 30): measure- take 699 mL of methanol (4.2), 300 mL of isopropanol (4.3) and 1 mL of methanol (4.4); mix it up and shake it well. 4.7 Benzophenone ultraviolet absorbent standard substance (purity ≥ 98%): see Appendix A. 4.8 Benzophenone ultraviolet absorbent standard stock solution (1,000 mg/L): accurately weigh-take the standard substance specified in 4.7, accurate to 0.1 mg; use methanol (4.2) to dissolve the benzophenone ultraviolet absorbent standard substance and reach a constant volume; prepare it into a single-component stock solution with a concentration of 1,000 mg/L. NOTE: the standard stock solution shall be stored in the dark at 0 °C ~ 4 °C; the validity period should be 3 months. 4.9 Benzophenone ultraviolet absorbent standard working solution: respectively transfer-take an appropriate volume of the standard stock solution (4.8); use methanol (4.2) to dilute it; prepare into standard working solution with different concentrations: 0.0 mg/L, 0.5 mg/L, 1 mg/L, 2 mg/L, 5 mg/L, 10 mg/L and 20 mg/L. NOTE: the standard working solution shall be stored in the dark at 0 °C ~ 4 °C; the validity period should be 1 month.5 Equipment and Instruments5.1 Extractor: with a sealing plug; about 60 mL; made of hard glass in a tubular form. 5.2 Ultrasonic generator: with a working frequency of 40 kHz. 5.3 Organic phase filter membrane: with a pore size of 0.45 μm. 5.4 Analytical balance: the division value is respectively 0.1 mg and 0.01 g. 5.5 High-performance liquid chromatograph: equipped with a diode array detector.6 Analytical Procedures6.1 Sample Preparation and Extraction7 Result Calculation and ExpressionThe determination result of this Method shall be respectively expressed in the detection results of the benzophenone ultraviolet absorbents, and be calculated in accordance with Formula (1): Where, Xi---the content of the benzophenone ultraviolet absorbent i extracted from the sample, expressed in (mg/kg); Ai---the peak area (or peak height) of the benzophenone ultraviolet absorbent i in the test solution; Ais---the peak area (or peak height) of the benzophenone ultraviolet absorbent i in the standard working solution; ci---the mass concentration of the benzophenone ultraviolet absorbent i in the standard working solution, expressed in (mg/L); c0---the mass concentration of the benzophenone ultraviolet absorbent i in the blank test, expressed in (mg/L); F---dilution factor; V---the final volume of the test solution, expressed in (mL); m---the mass of the sample, expressed in (g). The test result shall be respectively expressed in the detection results of the various benzophenone ultraviolet absorbents. The calculation result shall be retained to integers.8 Lower Limit of Determination and Precision8.1 Lower Limit of Determination The lower limit of determination of this Method is 10 mg/kg. 8.2 Precision The relative standard deviation of two test results obtained through mutually independent tests conducted in the same laboratory, and by the same operator using the same equipment and the same test method on the same object in a short period ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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