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GB 1886.330-2021 English PDF (GB1886.330-2021)

GB 1886.330-2021 English PDF (GB1886.330-2021)

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GB 1886.330-2021: National food safety standard - Food additives - Ammonium dihydrogen phosphate

This Standard applies to the food additive ammonium dihydrogen phosphate that is produced with liquid ammonia and the food additive phosphoric acid (including wet-process phosphoric acid) as raw materials.
GB 1886.330-2021
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
National food safety standard - Food additives -
Ammonium dihydrogen phosphate
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 -
Ammonium dihydrogen phosphate
1 Scope
This Standard applies to the food additive ammonium dihydrogen phosphate that is produced with liquid ammonia 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
NH4H2PO4
2.2 Relative molecular mass
115.02 (according to the international relative atomic mass in 2018)
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, so, be careful when operating! If
necessary, perform it in a fume hood. 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 solution, the standard solutions, preparations and products for impurity determination, which are used in the test, are all prepared in accordance with the provisions of GB/T 601, GB/T 602, and GB/T 603, when no 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 Nitric acid solution: 1+8.
A.2.1.2 Ammonia solution: 1+1.
A.2.1.3 Sodium hydroxide solution: 40 g/L.
A.2.1.4 Silver nitrate solution: 17 g/L.
A.2.1.5 Litmus red test paper.
A.2.2 Identification method
A.2.2.1 Identification of phosphate ion
Weigh 1.0 g of the sample; dissolve it in 20 mL of water; add silver nitrate solution, to produce a yellow precipitate. This precipitate is soluble in ammonia solution or nitric acid solution.
A.2.2.2 Identification of ammonium ion
Where:
V1 ?€? the volume of sodium hydroxide standard titration solution that is consumed by the titration sample solution, in milliliters (mL);
V2 ?€? the volume of sodium hydroxide standard titration solution that is consumed by the titration blank sample solution, in milliliters (mL);
c ?€? the concentration of the sodium hydroxide standard titration solution, in moles per liter (mol/L);
M ?€? the molar mass of ammonium dihydrogen phosphate (1/2NH4H2PO4), in
grams per mole (g/moL) (M = 57.51);
m ?€? sample mass, in grams (g).
1 000 ?€? conversion factor.
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 0.3%. A.4 Determination of pH (10 g/L aqueous solution)
A.4.1 Reagents and materials
Carbon dioxide-free water.
A.4.2 Instruments and apparatuses
Acidity meter: resolution of 0.01 pH, equipped with glass electrode and saturated calomel electrode (or composite electrode).
A.4.3 Analysis steps
Weigh 1.00 g ?? 0.01 g of the sample; place it in a 100 mL beaker; use carbon dioxide-free water to dissolve; transfer it into a 100 mL volumetric flask; use carbon dioxide-free water to dilute to the mark; shake well. Pour into a dry beaker; use a calibrated acidity meter to measure the pH of the sample solution. 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.
A.5 Determination of lead (Pb)

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