GB 1886.1-2015_English: PDF (GB1886.1-2015)
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National Food Safety Standard -- Food Additives -- Sodium carbonate
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GB 1886.1-2015
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National food safety standard - Food additives - Sodium carbonate
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GB 1886.1-2021
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Newer version: GB 1886.1-2021 Standards related to: GB 1886.1-2021
| Standard ID | GB 1886.1-2015 (GB1886.1-2015) | | Description (Translated English) | National Food Safety Standard -- Food Additives -- Sodium carbonate | | Sector / Industry | National Standard | | Classification of Chinese Standard | X42 | | Classification of International Standard | 67.220.20 | | Word Count Estimation | 12,111 | | Date of Issue | 2015-09-22 | | Date of Implementation | 2016-03-22 | | Older Standard (superseded by this standard) | GB 1886-2008 | | Regulation (derived from) | PRC National Health and Family Planning Commission 2015 No.8 | | Issuing agency(ies) | National Health and Family Planning Commission of the People's Republic of China | GB 1886.1-2015
(National food safety standards for food additives sodium)
National Standards of People's Republic of China
National Food Safety Standard
Food additive sodium carbonate
Issued on. 2015-09-22
2016-03-22 implementation
People's Republic of China
National Health and Family Planning Commission released
Foreword
This standard replaces GB 1886-2008 "food additive sodium carbonate."
This standard compared with GB 1886-2008, the main changes are as follows.
--- Standard name was changed to "national food safety standards for food additives sodium carbonate."
National Food Safety Standard
Food additive sodium carbonate
1 Scope
This standard applies to food additive sodium carbonate.
2 molecular formula and relative molecular mass
Formula 2.1
Na2CO3
2.2 relative molecular mass
105.99 (according to 2007 international relative atomic mass)
3 Technical requirements
3.1 Sensory requirements
Sensory requirements shall comply with the requirements of Table 1.
Table 1 Sensory requirements
Project requires test methods
Color White
Status crystalline powder
Take the right amount of sample is placed in a clean, dry white porcelain dish,
In natural light, observe its color and status
3.2 Physical and Chemical Indicators
Physical and chemical indicators should be consistent with the provisions of Table 2.
Table 2. Physical and chemical indicators
Item Index Test Method
Total Alkalinity (in Na2CO3 dollars) (dry basis), w /% ≥ 99.2 Appendix A A.5
Total Alkalinity (in Na2CO3 dollars) (with moisture basis), w /% ≥ 97.9 Appendix A A.5
Chloride (NaCl) (dry basis), w /% ≤ 0.70 A.6 in Appendix A
Iron (Fe) (dry basis), w /% ≤ 0.0035 Appendix A A.7
Heavy metals (Pb)/(mg/kg) ≤ 10.0 Appendix A A.8
Arsenic (As)/(mg/kg) ≤ 2.0 GB 5009.76
Water insoluble matter (dry basis), w /% ≤ 0.03 A.9 in Appendix A
Appendix A
Testing method
A.1 Safety Tips
Reagents The standard test methods used for toxic or corrosive, care should be taken. As should be immediately splashed on the skin
Rinsed with water, severe cases should be treated immediately. When using a volatile acid, to be carried out in a fume hood.
A.2 General Provisions
This standard reagents and water in the absence of other specified requirements, refer to the three water analytical reagent and GB/T 6682 regulations. test
The required standard solution, impurity standard solution, preparations and products, did not indicate when the other requirements according to GB/T 601, GB/T 602,
GB/T 603 provisions of the preparation. Solution was used in the tests did not indicate what is formulated with solvent, it refers to an aqueous solution.
A.3 Identification Test
A.3.1 Reagents and materials
A.3.1.1 hydrochloric acid.
A.3.1.2 magnesium sulfate solution. 120g/L.
A.3.1.3 saturated solution of calcium oxide.
Weigh about 3g calcium oxide, accurate to 0.1g, placed on the reagent bottle, added 1000mL water, cover stopper, shake vigorously after placing Cheng
clear. Supernatant using.
A.3.1.4 glass rod with a platinum wire ring.
A.3.2 Identification method
A.3.2.1 Preparation of test solution. Weigh about 20g sample, accurate to 0.1g, placed in a beaker, 100mL of water was added and dissolved.
A.3.2.2 wetting platinum wire ring with hydrochloric acid, colorless to burn in the flame, then dipped a little in the test solution combustion flame, the flame that was bright
yellow.
A.3.2.3 released in the test solution of hydrochloric acid was added dropwise while the carbon dioxide gas is passed into a saturated solution of calcium oxide to a white turbid liquid, continued
Ventilation cloudy to clear.
A.3.2.4 magnesium sulfate solution was added dropwise in the test solution, i.e., a white precipitate.
A.4 Determination of loss on ignition
A.4.1 Method summary
Samples were heated at 250 ℃ ~ 270 ℃ to constant mass. Loss of free water and sodium bicarbonate by the decomposition of water and dioxide when heated
Carbon, calculated loss on ignition.
A.4.2 Instruments and Equipment
A.4.2.1 weighing bottle. φ30mm × 25mm or porcelain crucible capacity 30mL.
A.4.2.2 electric oven or high-temperature furnace can be controlled at 250 ℃ ~ 270 ℃.
A.4.3 Analysis step
Previously at 250 ℃ ~ 270 ℃ dried to constant mass weighing bottles or porcelain crucible Weigh about 2g sample in the precise
0.0002g, placed in a high temperature oven or electric oven, heated to a constant mass at 250 ℃ ~ 270 ℃.
A.4.4 Calculation Results
Mass loss on ignition fraction w0, according to equation (A.1) Calculated.
w0 =
m1-m2
m × 100%
(A.1)
Where.
Mass m1 --- specimens and weighing bottle or porcelain crucible, in grams (g);
m2 --- heating quality specimens and weighing bottle or porcelain crucible after constant in units of grams (g);
M --- the quality of the sample, in grams (g).
Take the arithmetic mean of the parallel determination results of the measurement results, the results of parallel determination of the absolute difference is not more than 0.04%.
A.5 Total Alkalinity (in Na2CO3 meter) measurement
A.5.1 Method summary
Bromocresol green - methyl red mixed solution as the indicator solution, titration with hydrochloric acid standard solution titration.
A.5.2 Reagents and materials
A.5.2.1 hydrochloric acid standard titration solution. c (HCl) = 1mol/L.
A.5.2.2 Bromocresol green - methyl red mixed indicator solution.
A.5.3 Instruments and Equipment
A.5.3.1 weighing bottle (φ30mm × 25mm) or porcelain crucible (capacity 30mL).
A.5.3.2 electric oven or high-temperature furnace. can be controlled at 250 ℃ ~ 270 ℃.
A.5.4 Analysis step
A.5.4.1 alkali content (dry basis) of the Determination
Weigh 250 ℃ ~ 1.7g been dried to a constant mass of the sample 270 ℃, accurate to 0.0002g, set conical flask with 50mL
Samples dissolved in water, add 10 drops of bromocresol green - methyl red mixed indicator solution, titration with hydrochloric acid standard solution titration solution from green to dark red
Color, boiling 2min, cooled continue titration to dark red for the end. While doing the blank test.
A.5.4.2 Total alkali content (wet basis) Determination
Weigh 1.7g sample, accurate to 0.0002g, placed in a conical flask, dissolved in 50mL water, add 10 drops of bromocresol green - methyl red mixed
Indicator solution, titration with hydrochloric acid standard titration solution until the solution turns from green to dark red, boiling 2min, after cooling to continue titration to dark red
end. While doing the blank test.
A.5.5 Calculation Results
Total Alkalinity (in Na2CO3 meter) mass fraction w1, according to equation (A.2) Calculated.
w1 =
c × (V-V0) × M
m3 × 1000 ×
100% (A.2)
Where.
c --- hydrochloric acid standard titration solution concentration, in units of moles per liter (mol/L);
V --- titrated sample solution of hydrochloric acid standard volumetric consumption volume of the solution, in milliliters (mL);
Volume V0 --- hydrochloric acid standard titration titration solution consumed in the blank test solution, in milliliters (mL);
--- The M sodium carbonate molar mass in grams per mole (g/mol), [M (
2Na2CO3
) = 53.00];
M3 --- the quality of the sample, in grams (g);
1000 --- conversion factor.
The results parallel arithmetic mean of the measurement results shall prevail. In two independent determination results obtained under repeatability conditions absolute difference
Not more than 0.2%.
A.6 chloride (as NaCl) (dry basis) of the Determination
A.6.1 potentiometric titration
A.6.1.1 Method summary
See GB/T 3050-2000 Chapter 2.
A.6.1.2 Reagents and materials
A.6.1.2.1 nitric acid solution. 11.
A.6.1.2.2 saturated solution of potassium nitrate.
A.6.1.2.3 bromophenol blue indicator solution. 1g/L ethanol solution.
A.6.1.2.4 chloride standard solution. c (NaCl) = 0.05mol/L.
Weigh 2.9225g advance at 500 ℃ ~ 600 ℃ dried to a constant mass of the reference sodium chloride, accurate to 0.0002g, placed burning
Cup, add water to dissolve all moved into 1000mL volumetric flask, add water to the mark.
A.6.1.2.5 standard silver nitrate titration solution. c (AgNO3) = 0.05mol/L.
Preparation. Weigh 8.75g of silver nitrate, accurate to 0.01g, was dissolved in 1000mL of water, shake. Solution was kept in a brown bottle.
Calibration. Pipette Pipette 5mL sodium chloride standard solution, placed in 100mL beaker, add 40mL water, add electromagnetic stirrer,
The beaker was placed on a magnetic stirrer, agitator, add 2 drops of bromophenol blue indicator solution, nitric acid solution was dropped to just yellow. The electrical measurements
Electrode and a reference electrode inserted into the solution, the potentiometer connected wiring, adjustment potentiometer zero potential value of recording start. With standard silver nitrate titration solution
Titration, to join 4.00mL, then successively added 0.10mL. And the total volume of the corresponding record each addition of the standard silver nitrate titration solution after
The potential value E, calculate the difference between the continuous increase of ΔE1 and increased the potential value of the potential value ΔE1 between ΔE2. The maximum ΔE1
Titration is the end, the end and then continue to record a potential value E.
Recording format, see GB/T 3050-2000 Appendix C.
Titration to the end of the consumption of the standard silver nitrate titration solution volume V1 (mL), according to equation (A.3) Calculated.
V1 = V2
B × V3
(A.3)
Where.
V2 --- ΔE1 potential incremental value reaches the maximum volume previously added to the standard silver nitrate titration solution in milliliters (mL);
b --- ΔE2 last positive value;
B --- ΔE2 last positive and negative for the first time the absolute value of the sum;
V3 --- potential incremental value ΔE1 reach the last time before the maximum standard silver nitrate titration solution volume in milliliters
(ML).
Calculation of the standard silver nitrate titration solution concentration c1 (AgNO3) (mol/L), according to equation (A.4) Calculated.
c1 =
c2 × V5
V4
(A.4)
Where.
C2 --- sodium chloride standard solution concentration, expressed in moles per liter (mol/L);
Volume Pipette V5 --- titration of sodium chloride standard solution, in milliliters (mL);
Volume V4 --- titration consumption standard silver nitrate titration solution in milliliters (mL).
A.6.1.3 instruments and equipment
See GB/T 3050-2000 Chapter 5.
A.6.1.4 analysis step
Weigh about 1g sample, accurate to 0.01g, placed in 100mL beaker, add 40mL of water to dissolve. Following in A.6.1.2.5 into
OK, since "into electromagnetic stirrer" to start "before the end of a record potential value E" so far. But do not first nitric acid was added 4.00mL
Silver Standard Solution. While doing the blank test.
A.6.1.5 Calculation Results
Chloride (NaCl) (dry basis) of the mass fraction w2, according to equation (A.5) Calculated.
w2 =
c3 × (V7-V6) × M1 × 100
m4 × (100-w0) × 1000 ×
100% (A.5)
Where.
Concentration c3 --- standard silver nitrate titration solution, expressed in moles per liter (mol/L);
Volume V7 --- titration consumption standard silver nitrate titration solution in milliliters (mL);
Volume V6 --- blank test consumption standard silver nitrate titration solution in milliliters (mL);
--- Ml molar mass of sodium chloride, in units of grams per mole (g/mol), [M (NaCl) = 58.44];
M4 --- the quality of the sample, in grams (g);
w0 --- A.4 Quality Score from the measured loss on ignition;
1000 --- conversion factor.
The results parallel arithmetic mean of the measurement results shall prevail. In two independent determination results obtained under repeatability conditions absolute difference
Not more than 0.02%.
A.6.2 Mercury Method (Arbitration Act)
A.6.2.1 Method summary
In slightly acidic water or ethanol - water solution with a strong solution of nitrate mercury standard titration ionized chlorine into chloride ions weakly ionized
Mercury, with diphenylcarbazone indicator with an excess of hydrazine generates Hg2 purple complex to determine the end point.
A.6.2.2 Reagents and materials
A.6.2.2.1 nitric acid solution. 11.
A.6.2.2.2 nitric acid solution. 17.
A.6.2.2.3 sodium hydroxide solution. 40g/L.
A.6.2.2.4 nitrate mercury standard titration solution. c [
2Hg
(NO3) 2 · H2O] = 0.05mol/L.
A.6.2.2.5 bromophenol blue indicator solution. 1g/L.
A.6.2.2.6 diphenylcarbazone hydrazine indicator solution. 5g/L.
A.6.2.3 instruments and equipment
Buret. indexing is 0.01mL.
A.6.2.4 analysis step
A.6.2.4.1 Preparation of reference solution
In 250mL Erlenmeyer flask was added 40mL of water and 2 drops of bromophenol blue indicator solution. Was added dropwise a solution of nitric acid (A.6.2.2.1) to the solution from blue
Just become yellow, then drop 2 to 3 drops of excess. Join 1mL diphenylcarbazone hydrazine indicator solution, titration with mercury nitrate standard solution titration solution
From yellow to purple, record volume of mercury nitrate titration standard solution used. This solution was prepared prior to use.
A.6.2.4.2 measured sample
Weigh about 2g specimen to the nearest 0.01g, placed in 250mL conical flask, add water to dissolve 40mL, add 2 drops of bromophenol blue indicator solution drops
Was added nitric acid (A.6.2.2.1) and after to yellow, then dropping sodium hydroxide solution to the blue, and then a solution of nitric acid (A.6.2.2.2) adjusted exactly
Yellow and then excess 2 drops to 3 drops, added 1mL diphenylcarbazone hydrazine indicator solution, titration with mercury nitrate standard solution titration to change from yellow
The same ratio as the reference solution purple is the end.
Save the mercury-containing waste after titration up, according to GB 3051-2000 Annex D for processing.
A.6.2.5 Calculation Results
Chloride (NaCl) (dry basis) of the mass fraction w3, according to equation (A.6) Calculated.
w3 =
c4 × (V9-V8) × M2 × 100
m5 × (100-w0) × 1000 ×
100% (A.6)
Where.
c4 --- nitrate mercury standard titration solution concentration, in units of moles per liter (mol/L);
V9 --- titration volume consumed mercury nitrate titration standard solution, in milliliters (mL);
V8 --- reference solution was prepared in the volume of mercury nitrate standard titration solution consumption in milliliters (mL);
The M2 --- molar mass of sodium chloride, in units of grams per mole (g/mol), [M (NaCl) = 58.44];
M5 --- the quality of the sample, in grams (g);
w0 --- A.4 Quality Score from the measured loss on ignition;
1000 --- conversion factor.
The results parallel arithmetic mean of the measurement results shall prevail. In two independent determination results obtained under repeatability conditions absolute difference
Not more than 0.02%.
(Fe) (dry basis) of iron was measured A.7
A.7.1 Method summary
With GB/T 3049-2006 Chapter 3.
A.7.2 Reagents and materials
With GB/T 3049-2006 Chapter 4.
A.7.3 Instruments and Equipment
See GB/T 3049-2006 Chapter 5.
A.7.4 Analysis step
A.7.4.1 Preparation of test solution
It weighs about 10g sample, accurate to 0.01g, beaker, add a little water wet, covered with a watch glass, dropping 35mL hydrochloric acid solution
(11), boil 3min ~ 5min. Cooling (if necessary filtering) all transferred to 250mL volumetric flask, dilute to the mark, shake.
A.7.4.2 Preparation of the blank test solution
7mL amount of hydrochloric acid solution (11), placed in 100mL beaker, was added dropwise a solution of aqueous ammonia (23) to neutral (pH test precision
Paper test).
A.7.4.3 draw the curve
See GB/T 3049-2006 6.3. Select 4cm 5cm iron absorption cell and the corresponding volume or standard solution.
A.7.4.4 Determination
Pipette with a pipette 50mL test solution and the blank test solution 50mL, (18) or a hydrochloric acid solution was washed with aqueous ammonia solution
(13) was adjusted to a pH of about 2 (with a precision pH test paper). All were transferred to 100mL volumetric flask. Following in the
GB/T 3049-2006 6.4 absorbance measurement. Measuring the absorbance of the test solution and blank solution.
A.7.5 Calculation Results
Iron (Fe) (dry basis) of the mass fraction w4, according to equation (A.7) calculated as follows.
w4 =
(M8-m6) × 10-3 × 100 × 250
m7 × (100-w0) × 50 ×
100% (A.7)
Where.
m8 --- According to the test solution absorbance measured, quality iron isolated from the working curve, in milligrams (mg);
m6 --- blank test solution based on the absorbance measured, isolated from the working curve of iron mass, in milligrams (mg);
M7 --- the quality of the sample, in grams (g);
w0 --- A.4 measured by the loss on ignition of the mass fraction.
The results parallel arithmetic mean of the measurement results shall prevail. In two independent determination results obtained under repeatability conditions absolute difference
Not more than 0.0005%.
A.8 Determination of heavy metals (Pb) of
A.8.1 Method summary
Under weakly acidic conditions pH3 ~ 4, heavy metal ions in the sample and the role of hydrogen sulfide to produce brown-black, lead to the same standard of treatment
Comparison solution.
A.8.2 Reagents and solutions
A.8.2.1 hydrochloric acid solution. 14.
A.8.2.2 ammonia solution. 12.
A.8.2.3 glacial acetic acid. 115.
A.8.2.4 solution of sodium sulfide or hydrogen sulfide solution.
A.8.2.5 Lead standard solution. 1mL lead (Pb) 0.010mg, Extemporaneous. Pipette Pipette 10mL lead standard solution, placed
100mL volumetric flask, dilute to the mark, shake.
A.8.2.6 phenolphthalein indicator solution. 10g/L.
A.8.3 Analysis step
A.8.3.1 Preparation of test solution
Weigh 2.00g ± 0.01g sample was placed in 100mL beaker, add 5mL water, cover the surface of the dish, the cup slowly added 17mL
Hydrochloric acid solution, boiled for 5min, add 1 drop of phenolphthalein indicator solution was cooled, neutralized with aqueous ammonia solution to a pink and.
All transferred 50mL colorimetric tube, add 2mL acetic acid solution, 10mL solution of sodium sulfide or hydrogen sulfide solution, add water to the mark, shake
uniform. Place after 10min in the dark and relatively standard, it shall not be deeper than the standard.
A.8.3.2 Preparation of standard solutions for more than
Standard with a pipette of 2mL lead standard solution, placed in 100mL beaker. Press A.8.3.1 The "plus 5mL water" and start
The test solution at the same time in the same manner.
A.9 Determination of water insoluble matter (dry basis) of
A.9.1 Method summary
Samples were dissolved in water 50 ℃ ± 5 ℃, the insoluble was filtered, washed with, dried and weighed.
A.9.2 Reagents and materials
A.9.2.1 hydrochloric acid solution. 13.
A.9.2.2 Anhydrous sodium carbonate solution. 100g/L.
A.9.2.3 Phenolphthalein solution. 10g/L.
A.9.2.4 Pickling asbestos.
Acid appropriate amount of asbestos in a beaker, was added a solution of hydrochloric acid, boiled 20min, filtered through a Buchner funnel and washed until neutral. Remove soaked
In sodium carbonate solution and boiled 20min, filtered through a Buchner funnel and washed with water to neutral (phenolphthalein test solution), remove the beaker plus
Water into a paste and set aside.
A.9.2.5 asbestos filter paper.
A.9.3 Instruments and Equipment
A.9.3.1 Gooch crucible. capacity 30mL.
A.9.3.2 electric oven. can be controlled at 110 ℃ ± 5 ℃.
A.9.4 Analysis step
A.9.4.1 Gooch crucible shop system
A.9.4.1.1 Pickling asbestos Gooch crucible method (Arbitration Act)
The Gooch crucible filtration bottle placed on the sieve up and down the uniform layer of pickled asbestos, while suction side pressed with a flathead glass rod, each
Thickness of 3 mm. 50 ℃ ± 5 ℃ was washed with water until the filtrate does not contain asbestos fibers. The Gooch crucible placed in an electric oven at
110 ℃ ± 5 ℃ weighed after dried, repeated washing and drying to a constant quality.
A.9.4.1.2 asbestos paper Gooch crucible method
The Gooch crucible filtration bottle placed on the lower berth layer of asbestos paper sieve, sieve capped at two asbestos filter, suction side edge with a flat head
Pressed glass rod. Filter paper was washed with water, 5 ℃ 50 ℃ ±. The Gooch crucible placed in an electric oven at 110 ℃ ± 5 ℃ after drying weighed heavy
Re-washed, dried to a constant mass.
A.9.4.2 Determination
Weigh about 40g specimen to the nearest 0.01g, placed in a beaker, was added 400mL of water about 40 ℃ dissolved, the solution was maintained at
50 ℃ ± 5 ℃. Use has been constant quality Gooch crucible filtration, washed with 50 ℃ ± 5 ℃ with water until the filtrate take 20mL add 2 drops of phenolphthalein after
So far no significant red, wash water control a total volume of 800mL. Remove Gooch crucible placed in 110 ℃ ± 5 ℃ electric oven to quality
Constant.
A.9.5 Calculation Results
Water insoluble matter (dry basis) of the mass fraction w5 meter, according to equation (A.8) Calculated.
w5 =
m10 × 100
m9 × (100-w0) ×
100% (A.8)
Where.
m10 --- water insoluble mass in grams (g);
M9 --- the quality of the sample, in grams (g);
w0 --- A.4 measured by the loss on ignition of the mass fraction.
The results parallel arithmetic mean of the measurement results shall prevail. In two independent determination results obtained under repeatability conditions absolute difference
Not more than 0.006%.
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