GB 1886.342-2021 PDF English
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| GB 1886.342-2021 | English | 125 |
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National food safety standard - Food additives - Ammonium aluminum sulfatehydrate
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GB 1886.342-2021: National food safety standard - Food additives - Ammonium aluminum sulfatehydrate
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB1886.342-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National food safety standard - Food additive -
Ammonium aluminum sulfatehydrate
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 additive -
Ammonium aluminum sulfatehydrate
1 Scope
This Standard applies to the food additive ammonium aluminum sulfatehydrate,
which is produced with aluminum sulfate and ammonium sulfate as raw
materials.
2 Molecular formula and relative molecular mass
2.1 Molecular formula
Ammonium aluminum sulfate dodecahydrate: NH4Al(SO4)2·12H2O
Ammonium aluminum sulfatehydrate: NH4Al(SO4)2
2.2 Relative molecular mass
Ammonium aluminum sulfate dodecahydrate: 453.31 (according to 2018
international relative atomic mass)
Ammonium aluminum sulfatehydrate: 237.13 (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.
Appendix A
Inspection method
WARNING: Some reagents which are used in this test method are toxic or
corrosive, so, be careful when operating! If necessary, perform it in a fume
hood. If it is splashed on the skin, use water to rinse it 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 Sodium hydroxide solution: 100 g/L.
A.2.1.2 Barium chloride solution: 50 g/L.
A.2.1.3 Hydrochloric acid solution: 1+4.
A.2.1.4 Mercurous nitrate test paper: immerse the filter paper in a 50 g/L
mercurous nitrate solution and take it out to dry.
A.2.1.5 Litmus test paper.
A.2.2 Identification method
A.2.2.1 Identification of aluminum salt
Take the sample aqueous solution, add sodium hydroxide solution, and white
colloidal precipitation appears. The precipitate can be dissolved in excess
sodium hydroxide solution.
A.2.2.2 Identification of sulfate
Use a pipette to pipette 25 mL of sample solution A; place in a 250 mL conical
flask; then, use the pipette to add 50 mL of Ethylene Diamine Tetraacetic Acid
standard titration solution. Put a small piece of congo red test paper; use
ammonia solution to adjust the test paper to purple-red (pH ≈ 6); add 15 mL of
acetic acid-sodium acetate buffer solution; boil for 3 min. After cooling, add 3 ~
4 drops of xylenol orange indicator solution; use lead nitrate standard titration
solution to titrate to orange-yellow as the end point.
Do a blank test at the same time.
For the blank test, except that no sample is added, the other operations and the
type and amount of added reagents (except for the standard titration solution)
are the same as the determination test.
A.3.4 Result calculation
The mass fraction w1 of ammonium aluminum sulfate dodecahydrate
[AlNH4(SO4)2·12H2O] is calculated according to Formula (A.1).
Where:
V0 – volume of the lead nitrate standard titration solution that is consumed by
the titration of the blank sample solution, in milliliters (mL);
V – volume of the lead nitrate standard titration solution that is consumed by
the titration of the sample solution, in milliliters (mL);
c – exact value of the lead nitrate standard titration solution concentration, in
moles per liter (mol/L);
M -- value of the molar mass of aluminum ammonium sulfate dodecahydrate
[AlNH4(SO4)2·12H2O], in grams per mole (g/mol) (M = 453.33);
m – sample mass, in grams (g).
25 – volume of the pipetted sample solution, in milliliters (mL);
250 – volume of the sample solution, in milliliters (mL).
The mass fraction w2 of ammonium aluminum sulfatehydrate [AlNH4(SO4)2] is
calculated according to Formula (A.2).
Where:
m2 – value of the mass of the sample before drying, in grams (g);
m3 – value of the mass of the sample after drying, 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 0.05%.
A.5 Determination of loss on drying
A.5.1 Instruments and apparatuses
A.5.1.1 Electrothermal constant-temperature dry box: The temperature control
range is 200 °C ± 2 °C.
A.5.1.2 Weighing bottle: ϕ50 mm × 30 mm.
A.5.2 Analysis steps
Weigh about 6.0 g of the sample, accurate to 0.000 2 g; place it in a weighing
bottle that has been previously placed in an electrothermal constant-
temperature dry box at 200 °C ± 2 °C to dry to a constant mass; dry it at 200 °C
± 2 °C for 4 h.
A.5.3 Result calculation
Calculate the mass fraction w4 of loss on drying according to Formula (A.4).
Where:
m4 – mass of the weighing bottle and the sample before drying, in grams (g);
m5 – mass of the weighing bottle and the sample after drying, in grams (g);
m6 – 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 0.5%.
A.6 Determination of selenium (Se)
A.6.1 Reagents and materials
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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