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GB 1903.73-2025 PDF English

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GB 1903.73-2025: National food safety standard - Nutrition fortifier - Sodium chloride
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GB 1903.73-2025: National food safety standard - Nutrition fortifier - Sodium chloride

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GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA National Food Safety Standard - Nutrition Fortifier - Sodium Chloride Issued on: MARCH 16, 2025 Implemented on: SEPTEMBER 16, 2025 Issued by. National Health Commission of the People’s Republic of China; State Administration for Market Regulation.

Table of Contents

1 Scope... 3 2 Molecular Formula and Relative Molecular Mass... 3 3 Technical Requirements... 3 Appendix A Inspection Methods... 5 National Food Safety Standard - Nutrition Fortifier - Sodium Chloride

1 Scope

This Standard applies to sodium chloride, a food nutrition fortifier, produced from edible salt (not iodized) produced in accordance with relevant national standards, through the processes of impurity removal, crystallization, centrifugation and drying.

2 Molecular Formula and Relative Molecular Mass

2.1 Molecular formula NaCl 2.2 Relative molecular mass 58.44 (according to the 2022 international relative atomic mass)

3 Technical Requirements

3.1 Sensory requirements Sensory requirements shall comply with the provisions of Table 1. 3.2 Physical and chemical indicators The physical and chemical indicators shall comply with the provisions of Table 2.

Appendix A

Inspection Methods A.1 Safety Tips Some reagents such as sulfuric acid used in the inspection methods of this Standard are toxic or corrosive. Appropriate safety and protective measures shall be taken during operation. A.2 General Unless otherwise specified, the purity of the reagents used in this Standard shall be analytically pure. The used standard titration solution, standard solution for impurity determination, preparations and products shall be prepared in accordance with the provisions of GB/T 601, GB/T 602 and GB/T 603, respectively. The test water shall comply with the provisions of Grade 3 water specified in GB/T 6682.When the solution used in the test is not specified with which solvent to prepare, it refers to aqueous solution. A.3 Identification Test A.3.1 Reagents and materials A.3.1.1 Hydrochloric acid. A.3.1.2 Nitric acid. A.3.1.3 Nitric acid solution. c(HNO3) = 0.1 mol/L. Pipette 6.4 mL of nitric acid (A.3.1.2) and dilute it to 1,000 mL with water. A.3.1.4 Silver nitrate solution. 17 g/L. A.3.2 Instruments and equipment Electronic balance. Sensitivity is 0.1 g. A.3.3 Sodium ion identification Weigh about 1 g of the specimen and dissolve it in 10 mL of water. Dip a platinum wire in hydrochloric acid (A.3.1.1) and burn it on a colorless flame until it becomes colorless. Then dip a little test solution and burn it on a colorless flame. The flame shall turn bright yellow. A.3.4 Chloride ion identification Weigh about 1 g of the specimen, place it in a 125 mL conical flask; add 50 mL of water to dissolve it. And then add 10 mL of nitric acid solution (A.3.1.3) to make it acidic; add a few drops of silver nitrate solution (A.3.1.4); and a white curd-like precipitate shall be generated. A.4 pH test A.4.1 Reagents and materials A.4.1.1 Sodium hydroxide. A.4.1.2 Hydrochloric acid. A.4.1.3 Bromothymol blue. A.4.1.4 Sodium hydroxide solution. c(NaOH) = 0.02 mol/L. Weigh 0.8 g of sodium hydroxide (A.4.1.1); dissolve it in water and dilute to 1,000 mL. A.4.1.5 Bromothymol blue indicator solution. Take 0.1 g of bromothymol blue (A.4.1.3); add 8 mL of sodium hydroxide solution (A.4.1.4) to dissolve it; and then add water to dilute to 200 mL. A.4.1.6 Hydrochloric acid solution. c(HCl) = 0.02 mol/L. A.4.2 Instruments and equipment Electronic balance. Sensitivity is 0.01 g. A.4.3 Analysis procedures Weigh 5.0 g of the specimen (accurate to 0.01 g); add 50 mL of water to dissolve; and then add 0.10 mL of bromothymol blue indicator solution (A.4.1.5). If it turns yellow, add 0.10 mL of sodium hydroxide solution (A.4.1.4) and observe the color change; if it turns blue or green, add 0.20 mL of hydrochloric acid solution (A.4.1.6) and observe the color change. A.4.4 Judgment of results After adding bromothymol blue indicator solution (A.4.1.5) to the specimen solution, if it turns yellow, add sodium hydroxide solution (A.4.1.4) and turn it blue; if it turns blue or green, add hydrochloric acid solution (A.4.1.6) and turn it yellow, that is, the pH of the specimen passes the test. A.5 Solution clarity A.5.1 Method summary Compare the specimen solution with the specified turbidity standard solution to check the clarity of the solution. A.5.2 Reagents and materials A.5.2.1 Hydrazine sulfate. Dry to constant weight at 105°C before use. A.6.2.2 Acetic acid. A.6.2.3 Phenol red. A.6.2.4 Ammonium sulfate. A.6.2.5 Chloramine T. C7H7ClNNaO2S · 3H2O. A.6.2.6 Potassium bromide. Dry to constant weight at 105 °C before use. A.6.2.7 Sodium thiosulfate. A.6.2.8 Sodium hydroxide solution. c(NaOH) = 2 mol/L. Weigh 80 g of sodium hydroxide (A.6.2.1); dissolve in water; transfer to a 1,000 mL volumetric flask; and dilute to the scale. A.6.2.9 Acetic acid solution. c(CH3CO2H) = 2 mol/L. Weigh 113.2 mL of acetic acid (A.6.2.2) and dilute to 1,000 mL with water. A.6.2.10 Phenol red solution. Weigh 33 mg of phenol red (A.6.2.3); add 1.5 mL of sodium hydroxide solution (A.6.2.8); dissolve in water and dilute to 100 mL. A.6.2.11 Phenol red mixed solution. Weigh 25 mg of ammonium sulfate (A.6.2.4); add 235 mL of water; add 105 mL of sodium hydroxide solution (A.6.2.8); add 135 mL of acetic acid solution (A.6.2.9); shake well. Then add 25 mL of phenol red solution (A.6.2.10); shake well. Adjust the pH to 4.7 if necessary. A.6.2.12 Chloramine T solution (0.1 g/L). Weigh 0.01 g of chloramine T (A.6.2.5); dissolve in water; transfer to a 100 mL volumetric flask; and dilute to the scale. Prepare immediately before use. A.6.2.13 Sodium thiosulfate standard titration solution. c(Na2S2O3) = 0.1 mol/L. A.6.2.14 Potassium bromide standard solution. Weigh 30 mg of potassium bromide (A.6.2.6); dissolve in water and dilute to 100 mL. Take 1 mL of the resulting solution and dilute to 100 mL. Each 1 mL of potassium bromide standard solution contains 2 μg of Br-. A.6.3 Instruments and equipment A.6.3.1 Electronic balance. Sensitivity is 0.001 g. A.6.3.2 Spectrophotometer. A.6.4 Analysis procedures Weigh 2.0 g of the specimen (accurate to 0.001 g); place it in a 50 mL beaker; add water to dissolve; transfer quantitatively to a 100 mL volumetric flask; dilute to scale; and shake well. Pipette 5 mL of the resulting solution; place it in a 10 mL colorimetric tube; add 2.0 mL of phenol red mixed solution (A.6.2.11) and 1.0 mL of chloramine T solution (A.6.2.12); mix immediately; stand for 2 min; add 0.15 mL of sodium thiosulfate standard titration solution (A.6.2.13); dilute to scale with water; shake well; and use as the specimen solution. Take 5.0 mL of potassium bromide standard solution (A.6.2.14) and place it in a 10 mL colorimetric tube. Add 2.0 mL of phenol red mixed solution (A.6.2.11) and 1.0 mL of chloramine T solution (A.6.2.12); mix immediately and stand for 2 min. Add 0.15 mL of sodium thiosulfate standard titration solution (A.6.2.13). Dilute to the scale with water and shake well; use it as the control solution. Take the control solution and the sample solution separately and place them in a 1 cm colorimetric dish. Use water as the blank and use a spectrophotometer to measure the absorbance at a wavelength of 590 nm. A.6.5 Judgment of results If the absorbance of the specimen solution is no greater than that of the control solution, that is, the bromide in the specimen shall be less than 0.01%. A.7 Determination of phosphate A.7.1 Method summary Under strong acidic conditions, phosphate in the specimen solution reacts with ammonium molybdate to produce light yellowish phosphomolybdate yellow. Phosphomolybdate yellow is reduced to blue phosphomolybdate blue by stannous chloride. The darkness of blue is proportional to the phosphate content. The color of the specimen solution and the standard solution is compared by visual inspection. A.7.2 Reagents and materials A.7.2.1 Hydrochloric acid. A.7.2.2 Sulfuric acid. A.7.2.3 Ammonium molybdate. A.7.2.4 Stannous chloride. A.7.2.5 Potassium dihydrogen phosphate. Dry at 105 °C for 2 h before use. A.7.2.6 Sulfuric acid solution. Take 56 mL of sulfuric acid (A.7.2.2); mix with water and make constant volume to 100 mL. A.7.2.7 Ammonium molybdate sulfuric acid solution. Weigh 2.5 g of ammonium molybdate (A.7.2.3); add 20 mL of water to dissolve; add 50 mL of sulfuric acid solution (A.7.2.6); and dilute to 100 mL with water. A.7.2.8 Hydrochloric acid solution. Take 18 mL of hydrochloric acid (A.7.2.1); mix it with water and make constant volume to 100 mL. A.8.2.3 Potassium sulfate. A.8.2.4 Hydrochloric acid solution (V + V). 1+2. A.8.2.5 Barium chloride solution. 250 g/L, weigh 25 g of barium chloride (A.8.2.2); dissolve in water and dilute to 100 mL. A.8.2.6 Potassium sulfate standard solution. Weigh 0.181 g of potassium sulfate (A.8.2.3); dissolve in water and dilute to 1,000 mL. Each 1 mL of potassium sulfate standard solution contains 100 μg SO42-. A.8.3 Instruments and equipment Electronic balance. Sensitivity is 0.001 g. A.8.4 Analysis procedures Weigh 5.0 g of the specimen (accurate to 0.01 g); place it in a beaker; add 40 mL of water to dissolve; transfer to a 50 mL colorimetric tube. Add 2 mL of hydrochloric acid solution (A.8.2.4); shake well; add 5 mL of barium chloride solution (A.8.2.5); dilute to 50 mL with water; shake well; and stand for 10 min. At the same time, take 1.0 mL of potassium sulfate standard solution (A.8.2.6) in another 50 mL colorimetric tube; add 40 mL of water; add 2 mL of hydrochloric acid solution (A.8.2.4); shake well. Add 5 mL of barium chloride solution (A.8.2.5); dilute to 50 mL with water; shake well; and stand for 10 min. Place both on a black background, observe from the top of the colorimetric tube downward; and compare the turbidity of the specimen solution with that of the standard solution by visual inspection. A.8.5 Judgement of results If the turbidity of the specimen solution is no darker than that of the standard solution, that is, the sulfate in the specimen shall be less than 0.002%. A.9 Potassium salt test A.9.1 Method summary The potassium salt in the specimen forms a precipitate with the sodium tetraphenylborate solution; and compare the turbidity of the specimen solution with that of the standard solution by visual inspection. A.9.2 Reagents and materials A.9.2.1 Glacial acetic acid. A.9.2.2 Sodium tetraphenylborate. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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