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GB/T 4348.1-2013: Sodium hydroxide for industrial use -- Determination of sodium hydroxide and sodium carbonate content 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 4348.1: Historical versions
GB/T 4348.1-2013: Sodium hydroxide for industrial use -- Determination of sodium hydroxide and sodium carbonate content---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/GBT4348.1-2013 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.060.40 G 11 Replace GB/T 4348.1-2000 Sodium hydroxide for industrial use - Determination of sodium hydroxide and sodium carbonate content ISSUED ON: SEPTEMBER 6, 2013 IMPLEMENTED ON: JANUARY 31, 2014 Issued by: General Administration of Quality Supervision, Inspection and Quarantine of PRC; Standardization Administration of PRC. Table of ContentsForeword ... 3 1 Scope ... 5 2 Normative references ... 5 3 Principles ... 5 4 Reagents ... 6 5 Instruments ... 6 6 Analysis steps ... 6 7 Calculation of results ... 7 8 Test report ... 8 Sodium hydroxide for industrial use - Determination of sodium hydroxide and sodium carbonate content1 ScopeThis standard specifies the determination method of sodium hydroxide and sodium carbonate content in sodium hydroxide for industrial use. This standard applies to the determination of sodium hydroxide and sodium carbonate content in sodium hydroxide for industrial use.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) is applicable to this standard. GB/T 601 Chemical reagent - Preparations of reference titration solutions GB/T 603 Chemical reagent - Preparations of reagent solutions for use in test methods GB/T 6682 Water for analytical laboratory use - Specification and test methods (GB/T 6682-2008, ISO 3696:1987, MOD)3 Principles3.1 Determination principle of sodium hydroxide content The barium chloride is added to the sample solution, so that the sodium carbonate is converted into barium carbonate precipitate; then, phenolphthalein is used as the indicator solution, and hydrochloric acid standard titration solution is used to titrate to the end point. The reaction is as follows: 3.2 Determination principle of sodium carbonate content The bromocresol green-methyl red mixed indicator solution is used as the indicator solution for the sample solution, and the hydrochloric acid standard titration solution is used to titrate to the end point, so that the sum of sodium hydroxide and sodium carbonate is measured; then, the content of sodium hydroxide is subtracted, and the sodium carbonate content can be measured.4 Reagents4.1 General provisions Unless otherwise specified, the reagents and water used in this method refer to analytically pure reagents and Grade III water (free of carbon dioxide) specified in GB/T 6682 or water of equivalent purity. Unless otherwise specified, the standard titration solutions, preparations, and products required in the test shall be prepared according to the provisions of GB/T 601 and GB/T 603. 4.2 Barium chloride solution: 100 g/L; Before use, phenolphthalein (4.4) is used as the indicator solution, and the solution is adjusted to reddish color with standard sodium hydroxide solution. 4.3 Hydrochloric acid standard titration solution: c(HCl)=1 mol/L; 4.4 Phenolphthalein indicator solution: 10 g/L; 4.5 Bromocresol green-methyl red indicator solution.5 InstrumentsGeneral laboratory instruments and the following instruments. 5.1 Single-scale pipette: 50 mL, Type A; 5.2 Burette: 50 mL, with a division value of 0.1 mL, Type A; 5.3 Magnetic stirrer.6 Analysis steps6.1 Preparation of sample solution Use a weighing bottle to quickly weigh 30 g±1 g of solid sodium hydroxide or 50 g±1 ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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