GB 1903.77-2025 English PDFUS$119.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB 1903.77-2025: National food safety standard - Nutrition fortifier - Citric acid Status: Valid
Basic dataStandard ID: GB 1903.77-2025 (GB1903.77-2025)Description (Translated English): National food safety standard - Nutrition fortifier - Citric acid Sector / Industry: National Standard Classification of Chinese Standard: X40 Word Count Estimation: 6,675 Date of Issue: 2025-09-02 Issuing agency(ies): National Health Commission; State Administration for Market Regulation GB 1903.77-2025: National food safety standard - Nutrition fortifier - Citric acid---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/GB1903.77-2025National Standards of the People's Republic of China National Food Safety Standards Ferrous citrate, a food fortifier Published on 2025-09-02 Implemented on 2026-03-02 National Health Commission of the People's Republic of China State Administration for Market Regulation issued National Food Safety Standards Ferrous citrate, a food fortifier 1.Scope This standard applies to the food fortifier lemon, which is produced by reacting ferrous sulfate with sodium carbonate to form ferrous carbonate, and then reacting it with citric acid. Ferrous acid. 2.Molecular formula and relative molecular mass 2.1 Molecular Formula FeC6H6O7 2.2 Relative Molecular Mass 245.95 (based on 2022 international relative atomic mass) 3 Technical Requirements3.1 Sensory Requirements Sensory requirements shall comply with the provisions of Table 1. Table 1 Sensory Requirements Project Requirements Inspection Methods Color. slightly grayish-green or white Powder or crystal Place an appropriate amount of sample in a clean, dry white porcelain dish and expose it to natural light. Observe its color and condition. 3.2 Physicochemical Indicators The physicochemical properties should meet the requirements of Table 2. Table 2 Physicochemical Indicators Project indicator testing methods Ferrous iron content (Fe), w/% ≥ 20.0 (See Appendix A, A.3) Trivalent iron (Fe), w/% ≤ 3.0 (Appendix A, A.4) Chloride (as Cl), w/% ≤ 0.2 (Appendix A, A.5) Sulfate (as SO4), w/% ≤ 0.06 (Appendix A, A.6) Lead (Pb)/(mg/kg) ≤ 2.0 (Graphite Furnace Atomic Absorption Spectrometry, GB 5009.75)Appendix ATest methods A.1 General Provisions Unless otherwise specified, the reagents and water used in this standard refer to analytical grade reagents and Grade III water as specified in GB/T 6682.During the test... Unless otherwise specified, all standard solutions, impurity determination standard solutions, preparations, and products used shall comply with GB/T 601 and GB/T 602. Prepared according to GB/T 603.Unless otherwise specified, all solutions used in the tests are aqueous solutions. A.2 Identification Test A.2.1 Reagents and Materials A.2.1.1 Pyridine. A.2.1.2 Glacial acetic acid. A.2.1.3 Potassium ferricyanide solution. Weigh 1g of potassium ferricyanide [K3Fe(CN)6] and dissolve it in 10mL of water. This solution should be prepared and used immediately. A.2.2 Identification Method A.2.2.1 Identification of Citrate Weigh 1g of sample, add 10mL of water to prepare a 100mg/mL sample solution, then add 15mL of pyridine and 5mL of acetylene hydrate. Acidic; shake; the solution turns pale red. A.2.2.2 Identification of Ferrous Salts Weigh 1g of sample, add 10mL of water to prepare a 100mg/mL sample solution, and after adding an appropriate amount of potassium ferricyanide solution, a deep color is produced. Blue sediment. A.3 Determination of ferrous content (Fe) A.3.1 Method Summary In an acidic medium, titrate with a standard cerium sulfate solution, and indicate the endpoint with a 1,10-phenanthroline-ferrous indicator solution. A.3.2 Reagents and Materials A.3.2.1 Phosphoric acid. A.3.2.2 Sulfuric acid solution. Measure 16 mL of sulfuric acid, add it to 100 mL of water, cool to room temperature, and dilute with water to a final volume of 1000 mL. A.3.2.3 Cerium sulfate standard titration solution. c[Ce(SO4)2]=0.1mol/L. A.3.2.4 1,10-Phenanthroline-Ferrous Indicator Solution. Weigh 0.7 g of ferrous sulfate (FeSO4·7H2O), dissolve it in 100 mL of water, and add... Mix 2 drops of sulfuric acid with 0.15 g of 1,10-phenanthroline (C12H8N2·H2O). Store this solution in a sealed container. A.3.3 Instruments and Equipment Balance. Sensitivity is 0.0001g. A.3.4 Analysis Steps Weigh approximately 0.4 g of the sample (accurate to 0.0001 g), add it to 20 mL of sulfuric acid solution, add 5 mL of phosphoric acid, dilute with 50 mL of water, and shake. Shake to dissolve the sample. Add a few drops of 1,10-phenanthroline-ferrous indicator solution, and titrate with cerium sulfate standard solution until the solution changes from red to light red. Blue indicates the volume of cerium sulfate standard titration solution consumed. A blank test should also be performed simultaneously. A.3.5 Result Calculation The mass fraction w1 of ferrous iron (Fe) is calculated according to formula (A.1). w1= c1×(V1-V2)×M m×1000 × 100% (A.1) In the formula. c1 --- The concentration of the cerium sulfate standard titration solution, in moles per liter (mol/L); V1 --- The volume of cerium sulfate standard titration solution consumed in titrating the sample solution, in milliliters (mL); V2 --- The volume of cerium sulfate standard titration solution consumed in the titration of the blank solution, in milliliters (mL); M --- Molar mass of iron, in grams per mole (g/mol) [M(Fe) = 55.845]; m --- Mass of the sample, in grams (g); 1000 --- Volume conversion factor. The experimental results are based on the arithmetic mean of parallel measurements (rounded to two decimal places). Two independent measurements obtained under repeatability conditions are considered... The absolute difference between the results must not exceed 2% of the arithmetic mean. A.4 Determination of Trivalent Iron (Fe) A.4.1 Reagents and Materials A.4.1.1 Potassium iodide. A.4.1.2 Hydrochloric acid. A.4.1.3 Sodium thiosulfate standard titration solution. c(Na2S2O3)=0.1mol/L. A.4.1.4 Starch indicator solution. 10 g/L. A.4.2 Instruments and Equipment Balance. Sensitivity is 0.0001g. A.4.3 Analysis Steps Weigh approximately 2g of the sample (accurate to 0.0001g), dissolve it in 100mL of water and 10mL of hydrochloric acid, add 3g of potassium iodide, shake well, and dissolve in the dark. Let stand for 5 minutes. Add 0.5 mL of starch indicator solution and titrate with sodium thiosulfate standard solution until the blue color disappears. Record the amount consumed. The volume of sodium thiosulfate standard titration solution. A blank test should also be performed. A.4.4 Result Calculation The mass fraction w2 of ferric iron (Fe) is calculated according to formula (A.2). w2= c2×(V3-V4)×M m×1000 × 100% (A.2) In the formula. c2 --- Concentration of sodium thiosulfate standard titration solution, in moles per liter (mol/L); V3 --- The volume of sodium thiosulfate standard titration solution consumed in titrating the sample solution, in milliliters (mL); V4 --- The volume of sodium thiosulfate standard titration solution consumed in the titration of the blank solution, in milliliters (mL); M --- Molar mass of iron, in grams per mole (g/mol) [M (Fe) = 55.845]; m --- Mass of the sample, in grams (g); 1000 --- Volume conversion factor. The experimental results are based on the arithmetic mean of parallel measurements (rounded to two decimal places). Two independent measurements obtained under repeatability conditions are considered... The absolute difference between the results must not exceed 5% of the arithmetic mean. A.5 Determination of Chloride (as Cl) A.5.1 Reagents and Materials A.5.1.1 Nitric acid solution. 1 9 (V1 V2). A.5.1.2 Silver nitrate solution. 17 g/L. A.5.1.3 Chloride standard solution. 0.01 mg/mL. A.5.2 Instruments and Equipment Balance. Sensitivity is 0.01g. A.5.3 Analysis Steps Weigh 0.1 g of the sample (accurate to 0.01 g) and add it to a mixture of 2 mL nitric acid solution and 25 mL water (heat if necessary to dissolve). Solution), dilute with water to a final volume of 100 mL. Take 10 mL of the above solution, place it in a colorimetric tube, add 1 mL of silver nitrate solution, and dilute with water to a final volume of 100 mL. 50 mL, shake well, and let stand in the dark for 5 minutes. Compare the turbidity of the sample tube with that of the standard tube; the turbidity of the sample tube should not be greater than that of the standard tube, indicating that the chloride content in the sample is low. The mass fraction (as Cl) is less than or equal to 0.2%. Preparation of standard tubes. Accurately pipette 2 mL of chloride standard solution and treat it in the same way as the sample tube. A.6 Determination of sulfate (calculated as SO4) A.6.1 Reagents and Materials A.6.1.1 Hydrochloric acid solution. 1 3 (V1 V2). A.6.1.2 Barium chloride solution. 250 g/L. A.6.1.3 Sulfate standard solution. 0.1 mg/mL. A.6.2 Instruments and Equipment Balance. Sensitivity is 0.01g. A.6.3 Analysis Steps Weigh 0.5 g of the sample (accurate to 0.01 g), place it in a colorimetric tube, add 1 mL of hydrochloric acid solution, and dilute with water to 30 mL–40 mL. Add 1 mL of barium chloride solution, dilute with water to 50 mL, shake well, and let stand in the dark for 5 minutes. Compare the turbidity of the sample tube with that of the standard tube; the turbidity should not differ. The sample should be deeper than the standard tube, meaning the mass fraction of sulfate (as SO4) in the sample should be less than or equal to 0.06%. Preparation of standard tubes. 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