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GB 29209-2012 English PDF (GB29209-2012)

GB 29209-2012 English PDF (GB29209-2012)

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GB 29209-2012: Food additive sodium

This standard applies to food additive sodium sulfate produced from raw materials such as mirabilite. 2 Chemical name, molecular formula, and relative molecular mass 2.1 Chemical name Anhydrous sodium sulfate Sodium sulfate decahydrate 2.2 Molecular formula Anhydrous sodium sulfate: Na2SO4 Sodium sulfate decahydrate: Na2SO4 ? 10H2O 2.3 Relative molecular mass Anhydrous sodium sulfate: 142.04 (according to the 2007 International Relative Atomic Mass) Sodium sulfate decahydrate: 322.20 (according to the 2007 International Relative Atomic Mass) 3 Technical requirements 3.1 Sensory requirements Sensory requirements shall meet the requirements in Table 1. GB 29209-2012 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery Page 4 of 11 Table 1 -- Sensory requirements Item Requirements Testing method Anhydrous sodium sulfate Sodium sulfate decahydrate Color Colorless or white Colorless transparent or white translucent Take an appropriate amount of sample and place it in a 50 mL beaker, observe the color and state under natural light State Crystalline particle or powder Uniform granular crystal 3.2 Physiochemical indexes The physiochemical indexes shall meet the requirements in Table 2. Table 2 -- Physiochemical indexes Item Index Testing method Sodium sulfate (Na2SO4) content (by the dry basis), w/% 99.0~100.5 A.4 in Appendix A Lead (Pb)/(mg/kg) ???? 2 A.5 in Appendix A Selenium (Se)/(mg/kg) ???? 30 A.6 in Appendix A Arsenic (As)/(mg/kg) ???? 3 GB/T 5009.76 Loss on drying, w/% Anhydrous sodium sulfate ???? 1.0 A.7 in Appendix A Sodium sulfate decahydrate 51.0~57.0 GB 29209-2012 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery Page 5 of 11 Appendix A Testing method A.1 Warning Some of the reagents used in the test methods of this standard are toxic or corrosive, and appropriate safety and protective measures shall be taken during operation. A.2 General provisions Unless otherwise specified, the reagents and water used in this standard refer to analytical reagents an...
GB 29209-2012
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
National food safety standard - Food additive - Sodium
sulfate
ISSUED ON: DECEMBER 25, 2012
IMPLEMENTED ON: JANUARY 25, 2013
Issued by: Ministry of Health of the PEOPLE Republic of China
Table of Contents
1 Scope ... 3
2 Chemical name, molecular formula, and relative molecular mass ... 3
3 Technical requirements ... 3
Appendix A Testing method ... 5
National food safety standard - Food additive - Sodium
sulfate
1 Scope
This standard applies to food additive sodium sulfate produced from raw materials such as mirabilite.
2 Chemical name, molecular formula, and relative molecular
mass
2.1 Chemical name
Anhydrous sodium sulfate
Sodium sulfate decahydrate
2.2 Molecular formula
Anhydrous sodium sulfate: Na2SO4
Sodium sulfate decahydrate: Na2SO4 ?€? 10H2O
2.3 Relative molecular mass
Anhydrous sodium sulfate: 142.04 (according to the 2007 International Relative Atomic Mass)
Sodium sulfate decahydrate: 322.20 (according to the 2007 International Relative Atomic Mass)
3 Technical requirements
3.1 Sensory requirements
Sensory requirements shall meet the requirements in Table 1.
Appendix A
Testing method
A.1 Warning
Some of the reagents used in the test methods of this standard are toxic or corrosive, and appropriate safety and protective measures shall be taken during operation. A.2 General provisions
Unless otherwise specified, the reagents and water used in this standard refer to analytical reagents and third-grade water specified in GB/T 6682-2008. The standard solutions, preparations, and products used in the test for the determination of impurities shall be prepared in accordance with the provisions of GB/T 602 and GB/T 603 unless otherwise specified. The solution used refers to the aqueous solution when the solvent used for preparation is not indicated.
A.3 Identification test
A.3.1 Reagents and materials
A.3.1.1 Hydrochloric acid.
A.3.1.2 Potassium carbonate solution: 150 g/L.
A.3.1.3 Potassium pyroantimonate solution: Weigh 2 g of potassium pyroantimonate, dissolve it in 95 mL of hot water, and cool it rapidly; add 50 mL of potassium hydroxide solution (50 g/L) and 1 mL of sodium hydroxide solution (85 g/L), let it stand for 24 h, then filter it and add water to 150 mL.
A.3.1.4 Barium chloride (BaCl2 ?€? 2H2O) solution: 122 g/L.
A.3.1.5 Lead acetate solution: 95 g/L.
A.3.1.6 Platinum wire.
A.3.2 Identification method
A.3.2.1 Identification of sodium ions
A.3.2.1.1 Weigh about 0.1 g of the sample and dissolve it in 2 mL of water; add 2 mL of potassium carbonate solution, heat to boiling, and there shall be no precipitation. Add 4 mL of potassium pyroantimonate solution and heat to boiling. Cool it in ice water, rub the inner wall of the test tube with a glass rod if necessary, and there shall be a white precipitate.
A.3.2.1.2 Take a platinum wire, moisten it with the hydrochloric acid solution, and burn it in a colorless flame until it is colorless; then, dip a little sample solution and burn it on a colorless flame, the flame shall become bright yellow.
A.3.2.2 Identification of sulfate ion
A.3.2.2.1 Take about 0.5 g of the sample, dissolve it in 10 mL of water, add a barium chloride solution, and there shall be a white precipitate, which is insoluble in hydrochloric acid solution.
A.3.2.2.2 Take about 0.5 g of the sample, dissolve it in 10 mL of water, add a lead acetate solution, and there shall be a white precipitate, which is soluble in the ammonium acetate solution.
A.3.2.2.3 Take about 0.5 g of the sample, dissolve it in 10 mL of water, add hydrochloric acid, and there shall be no precipitation.
A.4 Determination of sodium sulfate (Na2SO4) content
A.4.1 Method summary
The sample is dissolved in water, a barium chloride is added under acidic conditions then to form a barium sulfate precipitate with sulfate ions in the test solution; after filtering, washing, drying, washing, burning, and weighing, the content can be calculated.
A.4.2 Reagents and materials
A.4.2.1 Hydrochloric acid solution: 1+1.
A.4.2.2 Barium chloride (BaCl2 ?€? 2H2O) solution: 122 g/L.
A.4.2.3 Silver nitrate solution: 20 g/L.
A.4.2.4 Slow quantitative filter paper.
A.4.3 Instruments and equipment
A.4.3.1 Electric constant-temperature drying oven: 105 ??C??2 ??C.
A.4.3.2 High-temperature furnace: The temperature can be controlled at 800 ?????25 ???. A.4.4 Analysis steps
Weigh about 5 g of the sample after being dried at 105 ?????2 ??? for 4 h, and the weight A.5.1.3 Nitric acid.
A.5.1.4 Sodium hydroxide solution: 250 g/L.
A.5.1.5 Ammonium pyrrolidine dithiocarbamate (APDC) solution: 20 g/L. Filter it before use.
A.5.1.6 Lead (Pb) standard solution: 0.01 mg/mL.
A.5.1.7 Water: It shall meet the provisions of the second-grade water in GB/T 6682- 2008.
A.5.2 Instruments and equipment
Atomic absorption spectrophotometer: It shall be equipped with a lead hollow cathode lamp.
A.5.3 Analysis steps
A.5.3.1 Cleaning of glass instruments
All instruments shall be soaked in a nitric acid solution (1+2) overnight, rinsed repeatedly with tap water, and finally rinsed with water.
A.5.3.2 Preparation of lead standard solution
Pipette 2.00 mL of lead standard solution, place it in a 150 mL beaker, and add 1 mL of hydrochloric acid. Heat it to boil for 5 min, cool it to room temperature, and dilute it with water to 100 mL. Use sodium hydroxide solution to adjust the pH of the solution to 1.0~1.5 (check with precision pH test paper). Transfer this solution to a 250 mL separatory funnel and dilute it with water to about 200 mL. Add 2 mL of ammonium pyrrolidine dithiocarbamate (APDC) solution and mix well. Extract twice with chloroform, add 20 mL each time, and collect the extract liquor (that is, the organic phase) in a 50 mL beaker; evaporate it to dryness on a steam bath (this operation must be performed in a fume hood), add 3 mL nitric acid to the residue, and continue to evaporate it to near dryness. Add 0.5 mL of nitric acid and 10 mL of water, and heat it until the volume of the solution is about 3 mL~5 mL. Transfer it to a 10 mL volumetric flask, dilute it to the mark with water, and shake well.
A.5.3.3 Preparation of sample solution
Weigh about 10 g of the sample, and the weight shall be accurate to 0.01 g; place it in a 150 mL beaker, and add 30 mL of water and 1 mL of hydrochloric acid. Cover it with a watch glass and heat to boiling for 5 min, then cool. Dilute it to 100 mL with water. Use sodium hydroxide solution to adjust the pH of the solution to 1.0~1.5 (check with precision pH test paper). The subsequent operations are the same as the steps in A.5.3.2 A.6.3.2 Preparation of standard solution
Pipette 6.00 mL of the selenium standard solution and place it in a 150 mL beaker. The subsequent operations are the same as the steps in A.6.3.1 ?€?add 25 mL hydrochloric acid solution... Collect the extract liquid?€?.
A.6.3.3 Preparation of the blank sample solution
Except that no sample is added to the blank sample solution, the types and amounts of reagents added are the same as those in the sample solution.
A.6.3.4 Determination
Use a 1 cm cuvette, at a wavelength of about 380 nm, with the blank sample solution as a reference, and measure the absorbance; the absorbance of the sample solution shall be not greater than the absorbance of the standard solution.
A.7 Determination of loss on drying
A.7.1 Instruments and equipment
Electric constant-temperature drying oven: The temperature can be controlled at 105 ??C??2 ??C.
A.7.2 Analysis steps
Weigh 1 g~2 g sample with a weighing bottle that has been dried at 105 ??C??2 ??C to a constant mass, and the weight shall be accurate to 0.0002 g; dry it in an electric constant-temperature drying oven at 105 ??C??2 ??C for 4 h.
A.7.3 Calculation of results
The mass fraction w2 of loss on drying is calculated according to the formula (A.2): where:
m --- The value of the mass of the sample, in grams (g);
m1 --- The value of the mass of the sample after drying, in grams (g).
The experimental results shall be the arithmetic mean of the parallel measurement results. The absolute difference between the two independent measurement results obtained under repeatability conditions shall be not more than 0.2% for anhydrous sodium sulfate and not more than 1.0% for sodium sulfate decahydrate.

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