GB 1886.325-2021 PDF EnglishUS$80.00 · In stock · Download in 9 seconds
GB 1886.325-2021: National food safety standard - Food additives - Potassium polymetaphosphate 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 1886.325-2021: National food safety standard - Food additives - Potassium polymetaphosphate---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/GB1886.325-2021GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA National food safety standard - Food additives - Potassium polymetaphosphate ISSUED ON: FEBRUARY 22, 2021 IMPLEMENTED ON: AUGUST 22, 2021 Issued by: National Health Commission of the People's Republic of China; State Administration for Market Regulation. Table of Contents1 Scope ... 3 2 Molecular formula and relative molecular mass ... 3 3 Technical requirements ... 3 Appendix A Inspection method ... 5 National food safety standard - Food additives - Potassium polymetaphosphate1 ScopeThis Standard applies to the food additive potassium polymetaphosphate which is made by high-temperature dehydration polymerization, with monopotassium phosphate as the raw material.2 Molecular formula and relative molecular mass2.1 Molecular formula (KPO3)n 2.2 Relative molecular mass 118.069n (according to the international relative atomic mass in 2018)3 Technical requirements3.1 Sensory requirements Sensory requirements shall be in accordance with Table 1. 3.2 Physical and chemical indicators Physical and chemical indicators shall be in accordance with Table 2. Table 2 – Physical and chemical indicatorsAppendix AInspection method WARNING: Some reagents used in this test method are toxic or corrosive; the operator shall be careful. If it is splashed on the skin, use water to rinse it immediately. If it is serious, seek medical attention immediately. A.1 General Provisions The reagents and water that are used in this Standard, when no other requirements are specified, refer to analytical reagents and grade-III water which is specified in GB/T 6682. The standard solution, the standard solutions, preparations and products for impurity determination, which are used in the test, are all prepared in accordance with the provisions of GB/T 601, GB/T 602, and GB/T 603, when no other requirements are specified. The solution used in the test, if not indicated which solvent is used, refers to aqueous solution. A.2 Identification test A.2.1 Reagents and materials A.2.1.1 Hydrochloric acid. A.2.1.2 Silver nitrate solution: 17 g/L. A.2.1.3 Ammonia solution: 2+3. A.2.1.4 Nitric acid solution: 1+9. A.2.1.5 Sodium acetate solution: 40 g/L. A.2.2 Identification method A.2.2.1 Identification of potassium ions Weigh 0.1 g of the sample and dissolve it in 10 mL of water. Dip the platinum wire in hydrochloric acid; burn it on the flame until it is colorless; then, dip the sample solution and burn it on the flame; observe that the flame is purple under the cobalt glass. A.2.2.2 Identification of phosphate Weigh 1 g of the sample; dissolve it in 20 mL of water; add silver nitrate solution, to produce a yellow precipitate. This precipitate is soluble in ammonia solution or nitric acid solution. again; continue to boil until the precipitate stratifies; cool to room temperature. Use a crucible that has been dried to constant weight at 180 °C ± 2 °C for filtration; filter the supernatant first; use water to rinse the precipitate and filter 6 times (about 30 mL of water each time); move the precipitate into the crucible; then, use water to rinse the precipitate 4 times; put the precipitate together with the crucible in a drying box; take it out after drying at 180 °C for 45 minutes; cool it to room temperature in a desiccator; weigh it. Use 10 mL of water instead of the sample solution, to do a blank test at the same time. A.3.5 Result calculation Calculate the mass fraction w1 of phosphorus pentoxide (P2O5) (on a dry basis) according to Formula (A.1). Where: m1 – the mass of quinoline phosphomolybdate precipitate that is formed by the test solution, in grams (g); m2 – the mass of quinoline phosphomolybdate precipitate that is formed by the blank solution, in grams (g); 0.032 07 – the coefficient of conversion of quinoline phosphomolybdate to phosphorus pentoxide (P2O5); 500 – the initial volume of the sample solution, in milliliters (mL); m – the mass of the dried sample, in grams (g); 10 – the measured volume of the sample solution, in milliliters (mL). The test result is based on the arithmetic mean of the parallel determination results. The absolute difference between two independent determination results that are obtained under repeatability conditions is not more than 0.3%. A.4 Determination of loss on ignition (on a dry basis) A.4.1 Instruments and apparatuses A.4.1.1 Crucible. A.4.1.2 Electrothermal constant-temperature dry box. A.4.1.3 High temperature furnace. ......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 1886.325-2021 be delivered?Answer: The full copy PDF of English version of GB 1886.325-2021 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 1886.325-2021_English with my colleagues?Answer: Yes. The purchased PDF of GB 1886.325-2021_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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