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GB 29214-2012: National food safety standards -- Food additives -- Ferrocyanide
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National food safety standards -- Food additives -- Ferrocyanide
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Basic data
Standard ID: GB 29214-2012 (GB29214-2012)
Description (Translated English): National food safety standards -- Food additives -- Ferrocyanide
Sector / Industry: National Standard
Classification of Chinese Standard: X40
Classification of International Standard: 67.220.20
Word Count Estimation: 8,823
Regulation (derived from): Ministry of Health Bulletin No. 23 of 2012
Issuing agency(ies): Ministry of Health of the People's Republic of China
Summary: This Chinese standard applies to sodium cyanide and ferrous sulfate or to restore the iron, sodium hydroxide and hydrogen cyanide as raw food additive sodium ferrocyanide.
GB 29214-2012: National food safety standards -- Food additives -- Ferrocyanide
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
National food safety standards.Food additives.Ferrocyanide
National Standards of People's Republic of China
National standards for food safety
Food Additives Sodium ferrocyanide
2012-12-25 release
2013-01-25 Implementation
Issued by the Ministry of Health of the People's Republic of China
National standards for food safety
Food Additives Sodium ferrocyanide
1 Scope
This standard applies to sodium cyanide and ferrous sulfate or with reduced iron powder, sodium hydroxide and hydrogen cyanide as raw materials to produce food additives
Sodium ferrocyanide.
2 Chemical name, molecular formula and relative molecular mass
2.1 Chemical name
Sodium ferricyanide decahydrate
2.2 Molecular formula
Na4Fe (CN) 6 · 10H2O
2.3 Relative molecular mass
484.06 (according to the.2007 International Relative Atomic Quality)
3 technical requirements
3.1 sensory requirements
Shall comply with the provisions of Table 1.
Table 1 sensory requirements
The project requires a test method
Color pale yellow
State granular or powdered crystals
Take appropriate sample in a 50 mL beaker and observe the color and state under natural light
3.2 Physical and chemical indicators
Shall comply with the provisions of Table 2.
Table 2 Physical and chemical indicators
Item Index Test Method
Sodium ferrocyanide [Na4Fe (CN) 6 · 10H2O] content, w /% ≥ 99.0 Appendix A A.4
Cyanide through Test Appendix A, A.5
The ferricyanide passes the test in Appendix A, A.6
Table 2 (continued)
Item Index Test Method
Chloride (in terms of Cl), w /% ≤ 0.2 Appendix A A.7
Sulfate (in SO4), w /% ≤ 0.07 Appendix A, A.8
Dry reduction, w /% ≤ 1.0 Appendix A A.9
Water insoluble matter, w /% ≤ 0.03 Appendix A. A.10
Arsenic (As)/(mg/kg) ≤ 3 GB/T 5009.76
Lead (Pb)/(mg/kg) ≤ 5 GB 5009.12
Appendix A
Testing method
A.1 Warning
Some of the reagents used in the test methods of this standard are toxic or corrosive and should be operated with appropriate safety and protective measures.
A.2 General provisions
The reagents and water used in this standard, when not specified, refer to the analytical reagent and the tertiary water specified in GB/T 6682-2008.
Standard titration solution used in the test, the standard solution for the determination of impurities, preparations and products, in the absence of other requirements, according to GB/T 601,
GB/T 602, GB/T 603. The solution used refers to an aqueous solution when it is not specified with any solvent formulation.
A.3 Identification test
A.3.1 Reagents and materials
Ferric chloride (FeCl3 · 6H2O) solution. 100 g/L.
A.3.2 Identification method
Weigh 0.1g sample, dissolved in 10mL water, add 1mL ferric chloride solution, blue-black precipitation generated.
Determination of the content of sodium ferrocyanide [Na4Fe (CN) 6 · 10H2O]
A.4.1 Methodological Summary
In the acidic medium, cerium sulfate and sodium ferrocyanide redox reaction, according to the standard titration solution of cerium sulfate standard solution
Sodium ferricyanide content.
A.4.2 Reagents and materials
A.4.2.1 Sulfuric acid.
A.4.2.2 Cettrium sulfate standard titration solution. c [Ce (SO4) 2] = 0.1 mol/L.
A.4.2.3 1,10-phenanthroline-ferrous indicator liquid.
A.4.3 Analysis steps
Weigh about 1.5g sample, accurate to 0.0002g, placed in 500mL Erlenmeyer flask, add 225mL water dissolved, along the bottle wall slowly
Into 25mL sulfuric acid, while adding 3 drops of 1,10-phenanthroline-ferrous indicator solution, titration solution with cerium sulfate titration to the color by the orange
Color becomes pure yellow.
At the same time to do a blank test, in addition to no sample, the other addition of the reagent and the sample solution is exactly the same, and the same sample
deal with.
A.4.4 Calculation of results
The mass fraction w1 of sodium ferrocyanide [Na4Fe (CN) 6 · 10H2O] is calculated according to formula (A.1)
w1 =
c (V-V0) M/1000
m x 100%
(A.1)
Where.
c - the exact value of the standard titration solution of cerium sulfate standard in moles per liter (mol/L);
V - titration sample solution consumed by the standard titration solution of cerium sulfate standard solution in milliliters (mL);
V0 --- titration blank sample solution consumption of cerium sulfate standard titration solution volume value in milliliters (mL);
m - the mass of the sample, in grams (g);
M - sodium ferrocyanide [Na4Fe (CN) 6 · 10H2O] in grams per mole (g/mol) (M =
484.06);
1000 --- conversion factor.
The experimental results are based on the arithmetic mean of the parallel measurement results. The absolute difference between the two independent determinations obtained under repeatability conditions
The value is not greater than 0.3%.
Determination of cyanide
A.5.1 Reagents and materials
A.5.1.1 copper sulfate solution. 1g/L. 0.1 g of copper sulfate was dissolved in 100 mL of aqueous ammonia (15).
A.5.1.2 Filter paper. A filter paper is wetted with a copper sulfate solution and the wet filter paper is placed in a hydrogen sulfide gas to give the filter paper brown.
A.5.2 Analysis steps
Approximately 1 g of the sample was weighed and dissolved in 100 mL of water. Drop 1 drop of this solution on the filter paper (A.5.1.2), should be no white ring generated.
A.6 Determination of ferricyanide
A.6.1 Reagents and materials
A.6.1.1 Lead nitrate solution. 10 g/L.
A.6.1.2 saturated solution of diaminobiphenyl acetic acid (12).
A.6.2 Analysis steps
Weigh about 0.1g sample, dissolved in 100mL water, drop 1 drop of the solution on the drip plate, add 1 drop of lead nitrate, add a few drops of two
Aminobiphenyl acetic acid (1 2) saturated solution should not be blue precipitated or blue appears.
A.7 Determination of chloride (in terms of Cl)
A.7.1 Reagents and materials
A.7.1.1 Nitric acid solution. 1 4.
A.7.1.2 Silver nitrate solution. 17 g/L.
A.7.1.3 Chloride-free copper sulfate solution. 50 g/L. Weigh 5g of chloride-free copper sulfate (with the analysis of pure copper sulfate pentahydrate
Crystallization twice), dissolved in water, diluted to 100mL.
A.7.1.4 Chloride (Cl) standard solution. 0.01 mg/mL.
A.7.1.5 Blue litmus paper.
A.7.2 Analysis steps
Weigh 0.50g ± 0.01g sample, add water to dissolve, add 12.5mL of chloride-free copper sulfate solution with stirring, stir well,
The solution was transferred to a 100 mL volumetric flask, diluted with water to a graduated volume and shaken. After clarification of the upper solution, dry filter, discard the initial 20mL.
Remove the 5.00 mL filtrate in a 50 mL colorimetric tube, add water to 25 mL, neutralize with nitric acid solution (test with blue litmus paper), add
Into 1mL nitric acid solution, 1mL silver nitrate solution, diluted with water to the mark, shake. Avoid light for 10min, the turbidity should not be deeper than the standard
Quasi-turbid solution.
Preparation of standard turbidimetric solution. Remove 5.00 mL of chlorine standard solution in 50 mL colorimetric tube, add water to about 25 mL, add no chloride
Of copper sulfate solution, the color and diluted to 25mL sample solution of the same color, add 1mL nitric acid solution, 1mL silver nitrate solution
Liquid, diluted with water to the mark, shake. Avoid light for 10min.
A.8 Sulfate (measured in SO4)
A.8.1 Reagents and materials
A.8.1.1 hydrochloric acid solution. 1 3.
A.8.1.2 barium chloride solution. 250 g/L.
A.8.1.3 Sulfate (SO4) standard solution. 0.05 mg/mL.
A.8.1.4 Blue litmus paper.
A.8.2 Analysis steps
Weigh 0.50g ± 0.01g sample, placed in 50mL colorimetric tube, add 30mL water dissolved sample, with hydrochloric acid solution to blue
Litmus paper turned red, then add 1mL hydrochloric acid solution, 3mL barium chloride solution, diluted with water to the mark, shake. Placed 10min, was cloudy
The degree should not be deeper than the standard turbid solution.
Preparation of standard turbid solution. Remove the standard solution of 7.00mL sulfate in 50mL colorimetric tube, add 1mL hydrochloric acid solution,
3mL barium chloride solution, diluted with water to the mark, shake. Placed for 10min.
A.9 Determination of dry reduction
A.9.1 Instruments and equipment
Electric thermostat oven. temperature can be controlled at 105 ℃ ± 2 ℃.
A.9.2 Analysis steps
Weigh about 2g of sample, accurate to 0.0002g. Placed in advance at 105 ° C ± 2 ° C dry to a constant weight of the weighing bottle
105 ℃ ± 2 ℃ electric constant temperature drying oven to dry to constant quality.
A.9.3 Calculation of results
The mass fraction w2 of the drying reduction is calculated according to the formula (A.2)
w2 =
(m-m1) -0.3721 × mw1
m x 100%
(A.2)
Where.
m - the mass of the mass before drying, in grams (g);
m1 --- the value of the mass after drying in grams (g);
w1 --- the value of sodium ferrocyanide measured in accordance with A.4;
0.3721 - Molecular weight of crystalline water in ferrous cyanide and the molecular mass of sodium ferrocyanide [Na4Fe (CN) 6 · 10H2O]
Ratio.
The experimental results are based on the arithmetic mean of the parallel measurement results. The absolute difference between the two independent determinations obtained under repeatability conditions
The value is not more than 0.05%.
A.10 Determination of water insoluble matter
A.10.1 Reagents and materials
Ammonium sulfate solution. 50g/L.
A.10.2 Instruments and equipment
A.10.2.1 glass sand core crucible. filter plate diameter 5μm ~ 15μm.
A.10.2.2 electric thermostat oven. can control the temperature at 105 ℃ ± 2 ℃.
A.10.3 Analysis steps
Weigh about 50g sample, accurate to 0.01g, placed in 400mL beaker, add 300mL of hot water to dissolve the sample. Take advantage of heat beforehand
Dried at 105 ° C ± 2 ° C until a constant glass chalk crucible was filtered and washed with hot water to ferrous sodium cyanide in the filtrate (ammonium ferric sulfate
Solution test). Placed in an electric thermostat oven, dried at 105 ℃ ± 2 ℃ to a constant mass.
A.10.4 Calculation of results
The mass fraction w3 of the water insoluble content is calculated according to formula (A.3)
w3 =
m1-m2
m x 100%
(A.3)
Where.
m1 --- the value of the quality of the glass sand core crucible and the residue in grams (g);
m2 --- the value of the quality of the glass sand core crucible in grams (g);
m - the mass of the sample, in grams (g).
The experimental results are based on the arithmetic mean of the parallel measurement results. The absolute difference between the two independent determinations obtained under repeatability conditions
The value is not more than 0.003%.
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