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GB 1886.3-2021 PDF English


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GB 1886.3-2021English125 Add to Cart 0-9 seconds. Auto-delivery. National food safety standard - Food additives - Calcium hydrogen phosphate Valid
GB 1886.3-2016English70 Add to Cart 0-9 seconds. Auto-delivery. Food additive -- Calcium monohydrogen phosphate Obsolete
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GB 1886.3-2021: PDF in English

GB 1886.3-2021 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA National food safety standard - Food additives - Calcium hydrogen phosphate 食品添加剂 磷酸氢钙 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 Contents Foreword ... 3  1 Scope ... 4  2 Molecular formula and relative molecular mass ... 4  3 Technical requirements ... 4  Annex A Inspection methods ... 6  National food safety standard - Food additives - Calcium hydrogen phosphate 1 Scope This Standard is applicable to the food additive calcium hydrogen phosphate produced with calcium hydroxide (or calcium carbonate, calcium oxide) and food additive phosphoric acid (including wet-process phosphoric acid) as raw materials. 2 Molecular formula and relative molecular mass 2.1 Molecular formula Calcium hydrogen phosphate dihydrate: CaHPO4·2H2O Anhydrous calcium hydrogen phosphate: CaHPO4 2.2 Relative molecular mass Calcium hydrogen phosphate dihydrate: 172.09 (according to 2018 international relative atomic mass) Anhydrous calcium hydrogen phosphate: 136.06 (according to 2018 international relative atomic mass) 3 Technical requirements 3.1 Sensory requirements The sensory requirements shall meet the requirements of Table 1. Table 1 -- Sensory requirements 3.2 Physical and chemical indicators The physical and chemical indicators shall meet the requirements of Table 2. Annex A Inspection methods WARNING: Some reagents used in this test method are toxic or corrosive. Appropriate safety and protection measures shall be taken during operation. When necessary, it shall be carried out in a fume hood. If it splashes on the skin, it shall be rinsed with water immediately. The severe cases shall be treated immediately. A.1 General The reagents and water used in this Standard refer to analytically-pure reagents and grade three water specified in GB/T 6682 when other requirements are not indicated. All standard solutions, preparations and products used in the test for impurity determination shall be prepared in accordance with the provisions of GB/T 601, GB/T 602, and GB/T 603 when other requirements are not specified. The solution used refers to an aqueous solution when it is not specified which solvent is used for preparation. A.2 Identification test A.2.1 Reagents and materials A.2.1.1 Hydrochloric acid solution: 1+3. A.2.1.2 Ammonia solution: 1+1. A.2.1.3 Nitric acid solution: 1+1. A.2.1.4 Ammonium oxalate solution: 35g/L. Weigh 3.5g of ammonium oxalate [(NH4))2C2O4·H2O] and dissolve it in water. Dilute to 100mL. A.2.1.5 Ammonium molybdate solution: 60g/L. Weigh 6g of ammonium molybdate [(NH4)6Mo7O24·4H2O] and dissolve it in 50mL of water. While stirring, slowly add the nitric acid solution to about 100mL. Store in a brown reagent bottle. A.2.2 Identification method A.2.2.1 Identification of calcium ion Weigh about 0.1g of specimen. Add 5mL of water, 5mL of hydrochloric acid solution to make the specimen dissolved. Add 2.5mL of ammonia solution dropwise while shaking. Then add 5mL of ammonium oxalate solution to generate white precipitation. A.2.2.2 Identification of phosphate ion Weigh about 0.1g of specimen. Add nitric acid solution dropwise until the specimen is dissolved and then exceed by 1mL. Heat to 40°C~50°C. Add 10mL of ammonium molybdate solution to generate yellow precipitation. A.3 Determination of calcium hydrogen phosphate content A.3.1 Method summary In the test solution, use triethanolamine as a masking agent. Under the acidic conditions, add the standard titration solution of disodium ethylenediaminetetraacetic acid dropwise to the end point. Use sodium hydroxide solution to adjust the pH of the test solution within the pH range of the hydroxynaphthol blue indicator color development. Continue to titrate the remaining calcium. A.3.2 Reagents and materials A.3.2.1 Triethanolamine. A.3.2.2 Hydrochloric acid solution: 1+1. A.3.2.3 Sodium hydroxide solution: 450g/L. A.3.2.4 Standard titration solution of disodium ethylenediaminetetraacetic acid: c(EDTA)=0.05mol/L. A.3.2.5 Hydroxynaphthol blue indicator. A.3.3 Instruments and equipment Magnetic stirrer. A.3.4 Analysis steps A.3.4.1 Preparation of test solution Weigh 2.5g of specimen, to the nearest of 0.0002g. Place in a 100mL beaker. Add 20mL of hydrochloric acid solution to dissolve. Transfer completely into a 250mL volumetric flask. Add water to the scale mark. Shake well. This solution shall be the test solution. A.3.4.2 Determination Accurately pipette 25mLof test solution in a 250mL Erlenmeyer flask. Add 100mL of water, 0.5mL of triethanolamine. Add 0.3g of hydroxynaphthol blue A.4.1.1 High temperature furnace: The temperature control range is 800°C~825°C. A.4.1.2 Porcelain crucible: 30mL. A.4.2 Analysis steps Weigh 3g of specimen, to the nearest of 0.0002g. Place in a porcelain crucible that has been burnt at 800°C~825°C to a constant mass. Burn at 800°C~825°C until the mass is constant. A.4.3 Result calculation The mass fraction w2 of ignition reduction is calculated according to formula (A.2). Where, m2 - The mass of the crucible and the specimen before burning, in grams (g); m3 - The mass of the crucible and the specimen after burning, in grams (g); m4 - The specimen mass, in grams (g). The test results are based on the arithmetic mean of the parallel determination results. The absolute difference between two independent determination results obtained under repeatability conditions is not more than 0.2%. A.5 Determination of insoluble matter in hydrochloric acid A.5.1 Reagents and materials Hydrochloric acid solution: 1+1. A.5.2 Instruments and equipment A.5.2.1 Glass sand crucible: The aperture of the filter plate is 5μm~15μm. A.5.2.2 Electric heating constant temperature drying oven: The temperature control range is 105°C±2°C. A.5.3 Analysis steps Weigh 10g of specimen, to the nearest of 0.01g. Place in a 250mL beaker. Add 40mL of hydrochloric acid solution and 60mL of water. Heat to dissolve. Add ......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.