GB 29201-2020 English PDF (GB29201-2020)

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GB 29201-2020: National food safety standard - Food additive - Ammonia solution and liquid ammonia
GB 29201-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National food safety standard - Food additive -
Ammonia solution and liquid ammonia
ISSUED ON: SEPTEMBER 11, 2020
IMPLEMENTED ON: MARCH 11, 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 
Foreword
This Standard replaces GB 29201-2012, “National Food Safety Standard -
Food Additive - Ammonia”.
Compared with GB 29201-2012, the major changes of this Standard are as
follows:
-- Change the standard name into “National food safety standard - Food
additive - Ammonia solution and liquid ammonia”;
-- Add the physical and chemical indicators and inspection methods of liquid
ammonia;
-- Adopt the method that is specified in GB 5009.75 or GB 5009.12 for the
determination and inspection of lead in ammonia solution.
National food safety standard - Food additive -
Ammonia solution and liquid ammonia
1 Scope
This Standard applies to the food additive ammonia solution that is produced
from liquid ammonia, and the food additive liquid ammonia that is produced
after the liquid ammonia is purified.
2 Molecular formula and relative molecular mass
2.1 Molecular formula
Ammonia solution: NH3·H2O
Liquid ammonia: NH3
2.2 Relative molecular mass
Ammonia solution: 35.04 (according to the international relative atomic mass in
2016)
Liquid ammonia: 17.03 (according to the international relative atomic mass in
2016)
3 Technical requirements
3.1 Sensory requirements
Sensory requirements shall be in accordance with Table 1.
Table 1 -- Sensory requirements
Appendix A 
Inspection method
A.1 Warning
Some reagents that are used in this test method are corrosive; the operator
must be careful! If it is splashed on the skin, use water to rinse immediately; in
severe cases, seek medical attention immediately. When flammable products
are used, it is strictly forbidden to use an open flame for heating.
A.2 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.3 Identification test
A.3.1 Reagents and materials
Hydrochloric acid.
A.3.2 Identification method
A.3.2.1 Identification of ammonia solution
Use a glass rod to dip the hydrochloric acid; close it to the sample, and there
shall be white smoke.
A.3.2.2 Identification of liquid ammonia
Take liquid ammonia samples according to the provisions of GB/T 8570.1; use
a glass rod to dip the hydrochloric acid; close it to the sample, and there shall
be white smoke.
A.4 Determination of ammonia (NH3) content
A.4.1 Method summary
Pipette an appropriate amount of sample into the sulfuric acid solution; use
sodium hydroxide standard titration solution to titrate the excess acid; use
methyl red as the indicator to determine the end point.
m1 -- 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 0.2%.
A.5 Determination of lead (Pb)
Perform the determination according to the method that is specified in GB
5009.75 or GB 5009.12; the water that is used in the test is grade-II water that
is specified in GB/T 6682.
A.6 Determination of evaporation residue
A.6.1 Instruments and apparatuses
Electrothermal constant-temperature drying oven: Control the temperature at
105 °C ± 2 °C.
A.6.2 Analysis steps
Use an evaporating dish that is dried to a constant mass at 105 °C ± 2 °C; weigh
about 10 g of sample, accurate to 0.000 2 g. After it is evaporated to dryness
on a water bath, place it in the electrothermal constant-temperature drying oven,
to dry at 105 °C ± 2 °C for 1 h; take out and cool to room temperature; weigh.
A.6.3 Result calculation
Calculate the mass fraction w2 of the evaporation residue according to Formula
(A.2):
Where:
m2 -- mass of the evaporating dish and residue after evaporation, in grams (g);
m3 -- mass of the empty evaporating dish before evaporation, in grams (g);
m4 -- 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 0.005%.
A.7 Determination of readily oxidizable substance
A.7.1 Reagents and materials