GB 1903.56-2022 Translated English of Chinese Standard (GB 1903.56-2022, GB1903.56-2022): National Food Safety Standard - Food nutritional fortification substance - Sodium selenate
https://www.chinesestandard.net, Jan 6, 2023 - Health & Fitness - 11 pages
This document applies to sodium selenite, a food nutritional fortification substance, of which sodium selenite is prepared from selenous acid and sodium hydroxide, and then it is obtained by oxidizing sodium selenite with hydrogen peroxide. 2 Chemical name, molecular formula, structural formula and relative molecular mass 2.1 Chemical name Sodium selenate. 2.2 Molecular formula Na2SeO4 2.3 Structural formula 2.4 Relative molecular mass 188.94 (according to the international relative atomic mass in 2018) 3 Technical requirements 3.1 Sensory requirements Sensory requirements shall meet the requirements in Table 1. GB 1903.56-2022 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 4 of 11 Table 1 -- Sensory requirements Item Requirement Inspection method Color White or colorless Take an appropriate amount of sample and put it in a clean and dry white porcelain plate. Under natural light, observe its color and state. State Crystalline powder 3.2 Physical and chemical indicators Physical and chemical indicators shall meet the requirements in Table 2. Table 2 -- Physical and chemical indicators Item Indicator Inspection method Sodium selenate content (on a dry basis), w/% ¡Ý 99.0 A.4 in Annex A Sodium selenite content (dry basis), w/% ¡Ü 0.1 A.4 in Annex A Loss on drying, w/% ¡Ü 0.5 Direct drying method a in GB 5009.3 Lead (Pb)/(mg/kg) ¡Ü 1.0 A.5 in Annex A Total arsenic (as As)/(mg/kg) ¡Ü 5.0 A.5 in Annex A Cadmium (Cd)/(mg/kg) ¡Ü 1.0 A.5 in Annex A Total Mercury (as Hg)/(mg/kg) ¡Ü 1.0 A.5 in Annex A a The sample weight is 10g. GB 1903.56-2022 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 5 of 11 Annex A Inspection methods A.1 Warning According to the provisions of Chapter 6 of GB 12268-2012, sodium selenate belongs to item 6.1 toxic substance. Handle with care. Some reagents used in the inspection methods of this Standard are toxic or corrosive. Operate according to relevant national regulations. Use it with caution. If splashed on skin, rinse wi...
0.5mL of nitric 100mL volumetric flask 10mL of water 1g of specimen A.5 in Annex accurate to 0.01g Add 2mL arithmetic mean beaker cadmium calculation result retains chemical indicators chromium Conduct blank test content of sodium Determination of sodium determining the drying Dissolve in 10mL drying loss Electronic balance Hydrochloric acid solution Inductively coupled plasma Inspection method iodide solution A.4.2.6 mass fraction milliliters mL molar mass mole g/mol nitric acid parallel determination results Pipette potassium iodide solution Reagents and materials red precipitate resolution is 0.01g result retains three selenate Weigh Sensory requirements set volume constant Shake Sodium chloride Sodium hydroxide sodium salt matrix sodium selenite content sodium thiosulfate standard specimen after determining specimen solution standard substance certificate standard titration solution starch indicator solution Sulfuric acid solution test solution tetravalent selenium thiosulfate standard titration titration solution consumed types and amounts volume of sodium water to dissolve water to set Weigh about 2g