PDF GB 1903.48-2020 English
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National food safety standard - Food nutritional fortification substance - Dimagnesium hydrogen phosphate
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GB 1903.48-2020: PDF in English GB 1903.48-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National Food Safety Standard - Food nutrition
enhancer - Magnesium hydrogen phosphate
ISSUED ON: SEPTEMBER 11, 2020
IMPLEMENTED ON: MARCH 11, 2021
Issued by: State Administration for Market Regulation;
National Health Commission 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
Annex A Test methods ... 5
National Food Safety Standard - Food nutrition
enhancer - Magnesium hydrogen phosphate
1 Scope
This Standard is applicable to the food nutrition enhancer - magnesium
hydrogen phosphate that is obtained by chemical synthesis and refining with
food additives - phosphoric acid and magnesium oxide or magnesium
hydroxide or magnesium carbonate.
2 Chemical name, molecular formula and relative
molecular mass
2.1 Chemical name
Magnesium hydrogen phosphate trihydrate
2.2 Molecular formula
MgHPO4 • 3H2O
2.3 Relative molecular mass
174.33 (according to 2018 international relative atomic mass)
3 Technical requirements
3.1 Sensory requirements
Sensory requirements shall comply with the provisions of Table 1.
3.2 Physical and chemical indicators
Annex A
Test methods
A.1 General
Unless otherwise specified, the reagents and water used in this Standard refer
to analytical reagents and grade 3 water specified in GB/T 6682. Unless
otherwise specified, the standard titration solutions used in the test, the
standard solutions, preparations and products used in the determination of
impurities are prepared according to the provisions of GB/T 601, GB/T 602 and
GB/T 603. When the solution used in the test does not indicate which solvent
is used for preparation, it refers to aqueous solution.
A.2 Identification test
A.2.1 Reagents and materials
A.2.1.1 Ethanol.
A.2.1.2 Ammonia solution: 2 + 3.
A.2.1.3 Nitric acid solution: 1 + 9.
A.2.1.4 Disodium hydrogen phosphate solution: WEIGH 12 g of disodium
hydrogen phosphate; DISSOLVE in 100 mL of water.
A.2.1.5 Ammonium molybdate solution: TAKE 6.5 g of powdered molybdic acid;
DISSOLVE in a mixture of 14 mL of water and 14.5 mL of ammonia; COOL;
slowly ADD it to the pre-cooled mixture of 32 mL of nitric acid and 40 mL of
water under stirring; LEAVE it for 48 h. PERFORM suction filtration and STORE
the filtrate in a dark place. The solution will deteriorate and become ineffective
when stored for a long time. When adding 2 mL of disodium hydrogen
phosphate solution to 5 mL of the above solution and it does not immediately
produce a large amount of yellow precipitate, the solution is ineffective.
A.2.1.6 Acetic acid solution: 6 %.
A.2.1.7 Ferric chloride solution: 90 g/L. WEIGH 9 g of ferric chloride (FeCl3 •
6H2O); ADD water to dissolve it to 100 mL.
A.2.1.8 Ammonium chloride solution: 100 g/L. WEIGH 10.5 g of ammonium
chloride (NH4Cl); ADD water to dissolve it to 100 mL.
A.2.1.9 Ammonium carbonate solution: 200 g/L. WEIGH 20 g of ammonium
carbonate; DISSOLVE it in water; ADD 20 mL of ammonia; DILUTE to 100 mL
with water.
A.2.1.10 Anhydrous trisodium phosphate solution: 60 g/L.
A.2.2 Identification method
A.2.2.1 Solubility
Slightly soluble in water, soluble in dilute acid, but insoluble in ethanol.
A.2.2.2 Identification of phosphate
WEIGH about 0.2 g of sample; DISSOLVE it in 10 mL of nitric acid solution;
ADD ammonium molybdate solution dropwise. It produces green-yellow
precipitation, which can be dissolved in aqueous ammonia.
A.2.2.3 Identification of magnesium ions
WEIGH about 0.1 g of sample; DISSOLVE it in 0.5 mL of acetic acid solution
and 20 mL of water; ADD 1 mL of ferric chloride solution; LET it stand for 5 min
and then FILTER. ADD 0.5 mL of ammonium chloride solution and 0.5 mL of
ammonium carbonate solution to the filtrate, STIR, no precipitation occurs; then
ADD 0.5 mL of anhydrous trisodium phosphate solution, it produces white
crystal precipitation; ADD 1.0 mL of ammonia solution, the white crystal
precipitation does not dissolve.
A.3 Determination of content [calculated as magnesium pyrophosphate
(Mg2P2O7)]
A.3.1 Method summary
In the sample solution, DROP disodium ethylenediaminetetraacetic acid
standard titration solution to near the end point, ADJUST the pH of the sample
solution to be within the coloring pH range of chrome black T indicator with
sodium hydroxide solution, and continue to TITRATE the remaining magnesium.
A.3.2 Reagents and materials
A.3.2.1 Hydrochloric acid.
A.3.2.2 Ammonia-ammonium chloride buffer solution: pH ≈ 10.
A.3.2.3 Sodium hydroxide solution: 43 g/L. WEIGH 4.3 g of sodium hydroxide;
DISSOLVE and DILUTE to 100 mL with water.
A.3.2.4 Disodium ethylenediaminetetraacetic acid standard titration solution:
c(EDTA) = 0.1 mol/L.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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