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GB/T 27741-2018: Paper and board - Determination of migratable fluorescent whitening agents 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 27741: Historical versions
Similar standardsGB/T 27741-2018: Paper and board - Determination of migratable fluorescent whitening agents---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/GBT27741-2018GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 85.010 Y 30 Replacing GB/T 27741-2011 Paper and board - Determination of migratable fluorescent whitening agents Issued on. DECEMBER 28, 2018 Implemented on. JULY 01, 2019 Issued by. State Market Regulatory Administration; Standardization Administration of PRC. Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 5 4 Sampling and preparation of specimen... 6 5 Qualitative determination... 6 6 Quantitative determination... 8 7 Detection limit and recovery rate... 13 8 Precision... 13 9 Test report... 13 Appendix A (Normative) Information on the name and chemical structure of fluorescent whitening agent... 14 Appendix B (Informative) Liquid chromatogram of HPLC analysis of fluorescent whitening agent standards... 15ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 27741-2011 "Paper and board - Determination of migratable fluorescent whitening agents". As compared with GB/T 27741-2011, the main technical changes except editorial changes are as follows. - MODIFY the scope of application of the standard (see Chapter 1; Chapter 1 of the 2011 edition); - MODIFY the definition of migratable fluorescent whitening agents (see 3.1; 3.1 of the 2011 edition); - MODIFY the preparation of the specimen (see 4.2; 5.4.1 of the 2011 edition); - MODIFY the expression of the glass funnel (see 5.3.2; 5.3.2 of the 2011 edition); - ADD the balance (see 5.3.4, 6.1.3.2, 6.2.3.2); - ADD the constant temperature oscillating water bath (see 5.3.5 and 6.1.3.3); - MODIFY the expression of the test procedure in the qualitative determination (see 5.4; 5.4 of the 2011 edition); - MODIFY the expression of the principle of UV-visible spectrophotometry (see 6.1.1; 6.1.1 of the 2011 edition); - MODIFY the representation of water in reagents and materials (see 6.1.2 and 6.2.2; 6.1.2 and 6.2.2.1 of the 2011 edition); - MODIFY the pH of the extracts in reagents and materials (see 6.1.2.2 and 6.2.2.5; 6.1.2 and 6.2.2 of the 2011 edition); - MODIFY the formulation of standard solutions in reagents and materials (see 6.1.2 and 6.2.2; 6.1.2 and 6.2.2 of the 2011 edition); - MODIFY the way the results are expressed (see 6.1.5 and 6.2.5; 6.1.5 and 6.2.5 of the 2011 edition); - MODIFY the analytical methods for high performance liquid chromatography (see 6.2; 6.2 of the 2011 edition); - ADD the lower detection limits and recovery rates (see Chapter 8); - MODIFY test report (see Chapter 9; Chapter 9 of the 2011 edition); - ADD the normative appendix A, Information on the name and chemical structure of fluorescent whitening agent; - ADD the informative appendix B, Liquid chromatograms of HPLC analysis of standard substance of fluorescent whitening agents. Please note that some of the contents of this document may involve patents. The issuing organization of this document is not responsible for identifying these patents. This standard was proposed by the China Light Industry Association. This standard shall be under the jurisdiction of the National Paper Industry Standardization Technical Committee (SAC/TC 141). Drafting organizations of this standard. National Paper Quality Supervision and Inspection Center, Shenzhen Inspection and Quarantine Science Research Institute, China Pulp and Paper Research Institute Co., Ltd., Chongqing Liwen Sanitary Paper Manufacturing Co., Ltd. The main drafters of this standard. Xie Tangtang, Wang Chengyun, Gao Jun, Li difei, Xu Rong, Lin Junfeng, Gu Haofei. This standard replaces the standard previously issued as follows. - GB/T 27741-2011. Paper and board - Determination of migratable fluorescent whitening agents Caution - Personnel using this standard shall have practical experience in formal chemistry experiment work. This standard does not address all safety issues; users are responsible for taking appropriate safety and health measures and ensuring compliance with the relevant national regulations.1 ScopeThis standard specifies qualitative and quantitative methods for the determination of migratable fluorescent whitening agents in paper and board. The qualitative analysis method of the migratable fluorescent whitening agent in this standard is applicable to various paper and board; the UV-visible spectrophotometry in the quantitative analysis method is suitable for the mobile fluorescent whitening agent (in VBL) in paper and board. The high performance liquid chromatography is suitable for the determination of the content of seven fluorescent whitening agents (see Appendix A) in paper and board; other fluorescent whitening agents can be tested with reference to it. The migratable fluorescent whitening agent in the pulp can be tested by reference to qualitative and quantitative methods in the standard.2 Normative referencesThe following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard. GB/T 450 Paper and board - Sampling for testing and identification of machine and cross direction, wire side and felt side GB/T 6682 Water for analytical laboratory use. Specification and test methods3 Terms and definitionsThe following terms and definitions apply to this document.4 Sampling and preparation of specimen4.1 Sampling The sample is taken according to the provisions of GB/T 450. 4.2 Preparation of specimen Cut the specimen into small pieces of about 5 mm x 5 mm. Mix them uniformly.5 Qualitative determination5.1 Principles After using an extract having a pH of 7.5 ~ 9.0 to extract the fluorescent whitening agent in paper and board, adjust the pH of the filtrate to 3.0 ~ 5.0. 5.2 Reagents and materials Unless otherwise stated, the reagents used are of analytical pure and the test water shall meet the grade-3 water as specified in GB/T 6682.The reagents and materials used shall be free of fluorescence under UV light. 5.2.1 Gauze. The size is about 5 cm x 5 cm. 5.3 Instruments 5.3.1 Conical flask. 250 mL. 5.3.2 Glass funnel. Glass core funnel with specification G1. 5.3.3 Glass watch glass. 5.4 Test procedure 5.4.1 Extraction of specimen Accurately weigh 2.0 g of the specimen and place it in a conical flask (5.3.1). Add 100 mL of the extract (5.2.4) to the flask. Whilst slowing shaking the flask, extract it at room temperature for 10 min. 5.4.2 Blank test Except for not adding specimen, follow the procedures of 5.4.1 to perform the blank test. 5.4.3 Testing Place the watch glass on which the specimen gauze (5.4.1) and the blank test gauze (5.4.2) are placed at about 20 cm under the UV lamp (5.3.6) in the dark room or dark box, to observe the gauze’s fluorescence phenomenon. Each specimen is subjected two parallel determinations.6 Quantitative determination6.1 UV-visible spectrophotometry 6.1.1 Principle The specimen is extracted by a water bath at 80 °C. After the extraction solution is filtered, use an ultraviolet-visible spectrophotometer to determine the absorbance of the fluorescent whitening agent in the specimen filtrate. With reference to the working curve of VBL standard solution of the fluorescent whitening agent, determine contents of the fluorescent whitening agent in the sample. 6.1.2 Reagents and materials Unless otherwise stated, the reagents used are of analytical pure and the test water shall meet the grade-2 water as specified in GB/T 6682. 6.1.2.5 Fluorescent whitening agent VBL standard working solution. Accurately transfer a certain volume of fluorescent whitening agent VBL standard stock solution (6.1.2.4) as needed. Use the extract (6.1.2.2) to dilute it to the appropriate concentration of standard working solution. The standard working solution is prepared before use. The linear range of the measurement under different working conditions of different instruments is different. The linearity of the standard solution concentration range from 1 mg/L to 20 mg/L has been proved to be satisfactory. 6.1.2.6 Microporous membrane. 0.45 μm. 6.1.3 Instruments 6.1.4 Test procedure 6.1.5 Calculation and representation of results Calculate the content of the migratable fluorescent whitening agent w (in VBL) in the specimen according to formula (1). 6.2 High performance liquid chromatography 6.2.1 Principle The specimen is extracted by a water bath at 80 °C. After the extracted solution is filtered, use the high performance liquid chromatography to analyze it. Use the retention time for qualitative and the external standard method for quantitative. 6.2.2 Reagents and materials Unless otherwise stated, the reagents used are of analytical pure and the test water shall meet the grade-1 water as specified in GB/T 6682. 6.2.2.4 Ammonia. 0.1%. 6.2.2.5 Extract. The aqueous solution the pH of which is adjusted by 0.1% ammonia (6.2.2.4). The pH of the solution is 7.5 ~ 9.0. 6.2.2.6 Fluorescent whitening agent standard stock solution (1000 mg/L). Accurately weigh 0.1000 g of the fluorescent whitening agent standard substance as listed in Appendix A. Respectively, use extract (6.2.2.5) to dissolve it. Make its volume reach to 100 mL. 6.2.3 Instruments 6.2.3.1 High performance liquid chromatograph, equipped with a fluorescence detector (FLD). 6.2.3.2 Balance. The sensitivities are 0.1 g and 0.1 mg. 6.2.4 Test procedure 6.2.4.1 Extraction of specimen It is performed according to 6.1.4.1. 6.2.4.2 Blank test Except for not adding specimen, follow the procedures of 6.1.4.1 to carry out the blank test. 6.2.4.3 Determination7 Detection limit and recovery rateThe detection limit of UV-visible spectrophotometry is 20.0 mg/kg. The detection limit of high performance liquid chromatography is 1.0 mg/kg.8 PrecisionIn the same laboratory, the same operator uses the same equipment according to the same test method to perform mutually independent tests for the same tested object within a short period of time.9 Test reportThe test report shall include at least the following. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 27741-2018 be delivered?Answer: The full copy PDF of English version of GB/T 27741-2018 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 27741-2018_English with my colleagues?Answer: Yes. 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