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GB 1903.57-2022 PDF in English


GB 1903.57-2022 (GB1903.57-2022) PDF English
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GB 1903.57-2022: PDF in English

GB 1903.57-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National food safety standard - Food nutrition enhancer -
Manganese citrate
食品营养强化剂 柠檬酸锰
ISSUED ON: JUNE 30, 2022
IMPLEMENTED ON: DECEMBER 30, 2022
Issued by: National Health Commission of the People’s Republic of China;
State Administration for Market Regulation.
Table of Contents
1 Scope ... 3
2 Chemical name, molecular formula, structural formula, and relative molecular mass
... 3
3 Technical requirements ... 3
Appendix A Testing method ... 5
National food safety standard - Food nutrition enhancer -
Manganese citrate
1 Scope
This standard applies to the food nutrition enhancer manganese citrate prepared by a
chemical reaction and with citric acid, manganese sulfate, and manganese carbonate as
the main raw materials.
2 Chemical name, molecular formula, structural formula, and
relative molecular mass
2.1 Chemical name
Manganese citrate
2.2 Molecular formula
Mn3(C6H5O7)2 • 10H2O (decahydrate)
Mn3(C6H5O7)2 (anhydrous substance)
2.3 Structural formula (anhydrous substance)
2.4 Relative molecular mass
723.17 (decahydrate) (according to 2018 International Relative Atomic Mass)
543.02 (anhydrous substance) (according to 2018 International Relative Atomic Mass)
3 Technical requirements
3.1 Sensory requirements
Appendix A
Testing method
A.1 Warning
Some of the reagents used in the test method of this standard are toxic or corrosive, and
they must be used with caution and in accordance with relevant regulations. If a toxic
or corrosive reagent splashes on the skin, it shall be washed with water immediately; if
the hurt is serious, it shall be treated immediately. When a volatile acid is used, the
operation shall be done in a fume hood.
A.2 General regulation
The reagents and water used in this standard refer to the analytical reagents and the
third grade and above test water stipulated in GB/T 6682 unless other requirements are
specified. The standard titration solution, standard solution for impurity determination,
preparations, and products used in the test shall be prepared according to the provisions
of GB/T 601, GB/T 602, and GB/T 603 unless other requirements are specified. The
solution used in the test 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 Glacial acetic acid.
A.3.1.2 Pyridine.
A.3.1.3 Acetic anhydride.
A.3.1.4 Ammonium sulfide solution: The content shall be ≥8%. The amount of residue
on ignition of this test solution shall not exceed 0.05%, and shall not be turbid when it
encounters magnesium sulfate test solution or calcium chloride test solution. If there is
an obvious sulfur precipitate in this test solution, the solution cannot be used. This
solution shall be held in a dark brown vial; the vial shall be filled and stored in a cool,
dark place.
A.3.1.5 Hydrochloric acid solution: 1 mol/L. Take 8.4 mL hydrochloric acid
(36.5%~38.0%), dissolve it in water, and dilute the solution to 100 mL.
A.3.2 Instruments and equipment
Analytical balance: The sense quantity shall be 0.1 g and 1 mg.
A.3.3 Identification method
A.3.3.1 Identification of manganese ions.
A.3.3.1.1 Method summary
When the manganese salt solution meets the ammonium sulfide test solution, a light
orange precipitate will be produced, which is soluble in glacial acetic acid.
A.3.3.1.2 Sample solution
Weigh about 1 g of the sample (the weight shall be accurate to 0.1 g) and dissolve it in
20 mL of 1 mol/L hydrochloric acid solution.
A.3.3.1.3 Operation steps
Add ammonium sulfide solution dropwise to 20 mL of the sample solution to form a
light orange precipitate. After standing for 10 minutes, add glacial acetic acid dropwise,
and then the precipitate can be dissolved.
A.3.3.2 Identification of citrate
A.3.3.2.1 Method summary
Citrate produces a carmine color in pyridine-acetic anhydride.
A.3.3.2.2 Operation method
Add 5 mg~10 mg of the sample (the weight shall be accurate to 1 mg) into 15 mL of
pyridine, then add 5 mL of acetic anhydride, and shake gently to produce a carmine
color.
A.4 Determination of the manganese citrate [Mn3(C6H5O7)2] content
A.4.1 Method summary
In an ammonia-ammonium chloride buffer solution with a pH of 10, the eriochrome
black T is used as an indicator, and the sample solution is titrated with the disodium
EDTA standard solution; the content of manganese citrate [by Mn3(C6H5O7)2] can be
calculated according to the usage amount of the disodium EDTA standard titration
solution.
A.4.2 Reagents and materials
A.4.2.1 Hydrochloric acid.
moles per liter (mol/L);
M --- The molar mass of manganese citrate, in grams per mole (g/mol),
[M(Mn3(C6H5O7)2=543.02];
m1 --- The mass of the sample, in grams (g);
w2 --- The mass fraction of the weight loss on drying of the sample, %;
3 --- The conversion factor;
1000 --- The conversion factor.
The arithmetic mean of the parallel determination results shall be taken as the test result.
The absolute difference between two independent determination results obtained under
repeatability conditions shall be not more than 0.2%.
A.5 Loss on drying
A.5.1 Instruments and equipment
A.5.1.1 Balance: The sense quantity shall be 0.1 mg.
A.5.1.2 Vacuum drying oven.
A.5.2 Analysis steps
Weigh 1.0 g~2.0 g of the sample (the weight shall be accurate to 0.0001 g), and carry
out the analysis according to the second method “Vacuum Drying Method” of GB
5009.3. The pressure and temperature in the vacuum drying oven used for the vacuum
drying method shall be as follows: the pressure does not exceed 20 mm Hg, the drying
temperature is 135 °C, and the time is 16 hours.
The loss on drying of the sample is calculated according to the formula (A.2).
where:
m2 --- The mass of the weighing bottle and the sample, in grams (g);
m3 --- The mass of the weighing bottle and the sample after drying, in grams (g);
m4 --- The mass of the weighing bottle, in grams (g).
When the loss on drying is ≥1 g/100 g, the calculation result retains three significant
figures; when the loss on drying is < 1 g/100 g, the calculation result retains two
significant figures.
A.6 Determination of arsenic
A.6.1 Reagents and materials
They shall be prepared according to GB 5009.76.
A.6.2 Instruments and equipment
They shall be prepared according to GB 5009.76.
A.6.3 Operation steps
The preparation method of the sample solution is as follows: Weigh an appropriate
amount of the sample according to GB 5009.76 (the weight shall be accurate to 0.001
g), add about 10 mL of hydrochloric acid, and heat on an electric heating plate until the
sample is completely dissolved.
Other operations are carried out according to GB 5009.76.
A.7 Determination of lead
A.7.1 Reagents and materials
They shall be prepared according to the first method, the third method or the fourth
method of GB 5009.12, or according to GB 5009.75.
A.7.2 Instruments and equipment
They shall be prepared according to the first method, the third method or the fourth
method of GB 5009.12, or according to GB 5009.75.
A.7.3 Operation steps
Sample pretreatment shall be carried out according to “5.2 Sample pretreatment” in GB
5009.12-2017, and only nitric acid is used for sample digestion. Other operations shall
be carried out according to the first method, the third method or the fourth method of
GB 5009.12-2017, or according to GB 5009.75.
A.8 Determination of sulfate
A.8.1 Method summary
In an acidic medium, the sulfate ion and barium ion in the sample form barium sulfate
precipitate, which is compared with the standard solution of sulfate treated in the same
method for a limit test.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.