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GB 29209-2012 (GB29209-2012)

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BASIC DATA
Standard ID GB 29209-2012 (GB29209-2012)
Description (Translated English) Food additive sodium
Sector / Industry National Standard
Classification of Chinese Standard X40
Classification of International Standard 67.220.20
Word Count Estimation 6,638
Regulation (derived from) Ministry of Health Bulletin 2012 No. 23
Issuing agency(ies) Ministry of Health of the People's Republic of China
Summary This Chinese standard applies to raw materials such as natural thenardite production of food additives sodium.

Standards related to: GB 29209-2012

GB 29209-2012
GB
NATIONAL STANDARD OF THE
PEOPLE’S 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’s 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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