GB 25576-2020 PDF English
US$110.00 · In stock · Download in 9 secondsGB 25576-2020: National food safety standard - Food additives - Silicon dioxide Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB 25576: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 25576-2020 | English | 110 |
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National food safety standard - Food additives - Silicon dioxide
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| GB 25576-2010 | English | 85 |
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National food safety standards of food additives silica
| Obsolete |
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GB 25576-2020: National food safety standard - Food additives - Silicon dioxide---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/GB25576-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National food safety standard - Food additive - Silicon
dioxide
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 25576-2010, “Food Additives - Silicon dioxide”.
Compared with GB 25576-2010, the major changes of this Standard are as
follows.
-- Modify the indicator of loss on drying for Type-III products to not more than
7.0%;
-- Modify the drying time for the inspection method of loss on drying;
-- Modify the ignition time for the inspection method of loss on ignition;
-- Modify the reference method of lead content determination;
-- Modify the reference method of arsenic content determination.
National food safety standard - Food additive - Silicon
dioxide
1 Scope
This Standard applies to fumed silica that is produced by the gas phase method
(chlorosilane is hydrolyzed in the oxygen-hydrogen flame), silica gel and
hydrated silica gel that are produced by the gel method (reaction of sodium
silicate solution and acid), and precipitated silicon dioxide that is produced by
the precipitation method (reaction of sodium silicate solution and acid).
2 Molecular formula and relative molecular mass
2.1 Molecular formula
SiO2
2.2 Relative molecular mass
60.08 (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.
and silica gel.
3.2 Physical and chemical indicators
Physical and chemical indicators shall be in accordance with Table 2.
Appendix A
Inspection method
A.1 Warning
Some reagents that are used in the test method of this Standard are toxic or
corrosive. The operator must be cautious! If splashed on the skin, use water to
rinse immediately. In severe cases, treat immediately.
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 impurity standard solutions, preparations
and products, which are used in the test, shall be prepared according to the
provisions of 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
A.3.1.1 Anhydrous potassium carbonate.
A.3.1.2 Ammonia.
A.3.1.3 Nitric acid.
A.3.1.6 O-tolidine glacial acetic acid saturated solution.
A.3.2 Identification method
A.3.2.1 Weigh about 5 mg of the sample in a platinum crucible; add 200 mg of
anhydrous potassium carbonate to mix; burn for about 10 minutes at 500 °C ~
600 °C; cool; add 2 mL of water to dissolve. If necessary, heat up; then, slowly
add 2 mL of ammonium molybdate solution, to produce a dark yellow color.
A.3.2.2 Drop 1 drop of the dissolved sample in A.3.2.1 onto the filter paper;
evaporate the solution; add 1 drop of o-tolidine glacial acetic acid saturated
solution; then, put the filter paper on the ammonia; there shall be green spots.
A.4 Determination of silicon dioxide content
A.4.1 Method summary
After the sample is burned at 950 °C ± 50 °C, heat excess hydrofluoric acid to
decompose the silicon dioxide, to react and produce fluorosilicic acid, which
escapes. Weigh after ignition; the lost mass is the silicon dioxide content.
A.4.2 Reagents and materials
A.4.3 Instruments and apparatuses
A.4.3.1 High temperature furnace. Control the temperature at 950 °C ± 50 °C.
A.4.3.2 Platinum crucible. 50 mL.
A.4.4 Analysis steps
Use a platinum crucible that is fired to a constant mass at 950 °C ± 50 °C to
weigh about 1 g of sample B (see A.6.2), accurate to 0.0002 g. Use an
appropriate amount of ethanol (about 2 mL) to wet the sample; add 5 ~ 6 drops
of sulfuric acid; add 10 mL of hydrofluoric acid to submerge the sample. Place
it on an electric furnace to evaporate until a large amount of white smoke
appears; cool it; add 5 mL of hydrofluoric acid; carefully reverberate the crucible
to rinse the inner wall; then, evaporate to dryness. Burn at 950 °C ± 50 °C for
60 min ± 5 min. Take it out; cool it in a desiccator; weigh it.
A.5 Determination of loss on drying
A.5.1 Instruments and apparatuses
A.5.1.1 Electrothermal constant-temperature drying oven. Control the
temperature at 105 °C ± 2 °C.
A.5.1.2 Weighing bottle. ϕ60 mm × 30 mm.
A.5.2 Analysis steps
Use a weighing bottle that is dried at 105 °C ± 2 °C to weigh 2 g ~ 3 g of the
sample (for Type-II, weigh 8 g ~ 10 g), accurate to 0.000 2 g. Transfer it into the
electrothermal constant-temperature drying oven; dry at 105 °C ± 2 °C for 120
min ± 5 min; cool in a desiccator; weigh. Keep this dried sample as sample A,
for use in the determination of loss on ignition in A.6.
A.5.3 Result calculation
Calculate the mass fraction w2 of loss on drying according to Formula (A.2).
Where.
A.6 Determination of loss on ignition
A.6.1 Instruments and apparatuses
A.6.2 Analysis steps
Weigh 1 g ~ 2 g of sample A (see A.5.2), accurate to 0.000 2 g; place it in a
porcelain crucible that is fired to a constant mass at 950 °C ± 50 °C; burn it at
950 °C ± 50 °C for 60 min ± 5 min; cool in a desiccator; weigh. Keep this burnt
sample as sample B, for use in the determination of silicon dioxide content in
A.4.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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