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GB 1886.339-2021: National food safety standard - Food additives - Sodium pyrophosphate
GB 1886.339-2021
GB
NATIONAL STANDARD OF THE
PEOPLE?€?S REPUBLIC OF CHINA
National food safety standard - Food additives -
Sodium pyrophosphate
ISSUED ON: FEBRUARY 22, 2021
IMPLEMENTED ON: AUGUST 22, 2021
Issued by: National Health Commission of the People's Republic of
China;
State Administration for Market Regulation.
Table of Contents
Foreword ... 3??
1 Scope ... 4??
2 Molecular formula and relative molecular mass ... 4??
3 Technical requirements ... 4??
Appendix A Inspection method ... 6??
National food safety standard - Food additives -
Sodium pyrophosphate
1 Scope
This Standard applies to food additive sodium pyrophosphate that is produced
with sodium carbonate (or sodium hydroxide) and the food additive phosphoric
acid (including wet-process phosphoric acid) as raw materials.
2 Molecular formula and relative molecular mass
2.1 Molecular formula
Anhydrous sodium pyrophosphate: Na4P2O7
Sodium pyrophosphate decahydrate: Na4P2O7??10H2O
2.2 Relative molecular mass
Anhydrous sodium pyrophosphate: 265.91 (according to 2018 international
relative atomic mass)
Sodium pyrophosphate decahydrate: 446.07 (according to 2018 international
relative atomic mass)
3 Technical requirements
3.1 Sensory requirements
Sensory requirements shall be in accordance with Table 1.
Table 1 ?€? Sensory requirements
3.2 Physical and chemical indicators
Physical and chemical indicators shall be in accordance with Table 2.
Table 2 ?€? Physical and chemical indicators
Appendix A??
Inspection method
WARNING: Some reagents which are used in the test method of this
Standard are toxic or corrosive; be careful during the operation. If it
splashes on the skin or eyes, use plenty of water to rinse immediately; if
it is serious, seek medical attention immediately.
A.1 General provisions
The reagents and water that are used in this Standard, when no other
requirements are specified, refer to analytical reagents and grade-III water
which is specified in GB/T 6682. The standard titration solutions, preparations
and products, which are used in the test, are all prepared in accordance with
GB/T 601, GB/T 602, and GB/T 603, unless other requirements are specified.
The used solution, if not indicated which solvent is used, refers to aqueous
solution.
A.2 Identification test
A.2.1 Reagents and materials
A.2.1.1 Hydrochloric acid.
A.2.1.2 Nitric acid solution: 1+9.
A.2.1.3 Quinomolimidone solution: Prepare according to the requirements of
HG/T 3696.3.
A.2.1.4 Platinum wire ring.
A.2.2 Identification method
A.2.2.1 Sodium ion
Weigh 1 g of the sample; add 20 mL of water to dissolve; use hydrochloric acid
to wet the platinum wire ring; then, burn it on a colorless flame until it is colorless;
then, dip the test solution and burn it in a colorless flame; the flame shall be
bright yellow.
A.2.2.2 Pyrophosphate ion
A.2.2.2.1 Sample solution: Dissolve 0.1 g of the sample in 100 mL of nitric acid
solution.
Third crystallization: Recrystallize the second crystallization according to the
method of the second crystallization.
b) Preparation method with reagent sodium pyrophosphate decahydrate as raw
material:
Weigh 80 g of the reagent sodium pyrophosphate decahydrate; operate
according to the first and second crystallization methods in a).
Place the sodium pyrophosphate that is recrystallized by the above method in
a porcelain crucible; burn at 400?? C to a constant mass.
A.3.2.5 Sodium hydroxide standard titration solution: c(NaOH) = 0.1 mol/L.
Calibration: Weigh about 0.5 g of anhydrous sodium pyrophosphate (A.3.2.4),
accurate to 0.000 2 g; place it in a 250 mL beaker; add 90 mL of water to
dissolve; add hydrochloric acid solutions (A.3.2.1, A.3.2.2) to adjust the pH of
the solution to 3.8. Add 50 mL of zinc sulfate solution; stir for 5 min; use sodium
hydroxide standard titration solution to titrate under stirring, until the pH of the
solution is close to 3.6; stir for 2 min to make the solution reach equilibrium;
continue to titrate until the pH is 3.8; stir for 30 seconds after each drop at this
time.
The number of grams ?? of 0.1 mol/L sodium hydroxide standard titration solution
per milliliter that is equivalent to sodium pyrophosphate, in grams per milliliter
(g/mL), is calculated according to Formula (A.1).
Where:
m1 ?€? mass of the weighted anhydrous sodium pyrophosphate, in grams (g);
V1 ?€? volume of the sodium hydroxide standard titration solution that is
consumed in calibration, in milliliters (mL).
A.3.3 Instruments and apparatuses
A.3.3.1 Potentiometric titrator or pH meter: the resolution is 0.01 mV or 0.02 pH.
A.3.3.2 Electromagnetic stirrer.
A.3.4 Analysis steps
Weigh about 5 g of the sample, accurate to 0.000 2 g; dissolve the sample in
water; transfer to a 500 mL volumetric flask; dilute to the mark and shake well;
filter if necessary.
A.4.1.3 Porcelain crucible.
A.4.2 Analysis steps
Weigh about 5 g of the sample, accurate to 0.000 2 g; place it in a porcelain
crucible that has been burn to a constant mass at 800 ??C ?? 25 ??C; bake it at
110 ??C ?? 2 ??C for 4 h; then, move it into a high-temperature furnace at 800 ??C
?? 25 ??C to burn for 30 minutes; cool to room temperature in a desiccator; weigh.
A.4.3 Result calculation
Calculate the mass fraction w3 of loss on ignition according to Formula (A.4).
Where:
m3 ?€? mass of the sample and the porcelain crucible before firing, in grams (g);
m4 ?€? mass of the sample and the porcelain crucible after firing, in grams (g);
m5 ?€? sample mass, in grams (g).
The test result is based on the arithmetic mean of the parallel determination
results. The absolute difference between two independent determination results
that are obtained under repeatability conditions is: not more than 0.1% for
sodium pyrophosphate decahydrate; not more than 0.02% for anhydrous
sodium pyrophosphate.
A.5 Determination of water insoluble matter
A.5.1 Instruments and apparatuses
A.5.1.1 Glass sand crucible: The aperture of the filter plate is 5 ??m ~ 15 ??m.
A.5.1.2 Electrothermal constant-temperature dry box: The temperature control
range is 105 ??C ?? 2 ??C.
A.5.2 Analysis steps
Weigh about 20 g of the sample, accurate to 0.01 g; place it in a 400 mL beaker;
add 200 mL of water; heat to dissolve it. While it is hot, use a glass sand crucible
of constant mass at 105 ??C ?? 2 ??C to filter; use hot water to wash it until the
filtrate is alkali-free. Place the glass sand crucible and water-insoluble matter in
an electrothermal constant-temperature dry box at 105 ??C ?? 2 ??C to dry until the
mass is constant.