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GB 1886.341-2021: National food safety standard - Food additives - Titanium dioxide
GB 1886.341-2021
GB
NATIONAL STANDARD OF THE
PEOPLE?€?S REPUBLIC OF CHINA
National food safety standard - Food additives -
Titanium dioxide
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 -
Titanium dioxide
1 Scope
This Standard applies to the food additive titanium dioxide, which is produced
by the sulfuric acid method, with ilmenite as raw material, or the chlorination
process, with rutile ore (or enriched ilmenite) as raw material, and then refined
and purified.
2 Molecular formula and relative molecular mass
2.1 Molecular formula
TiO2
2.2 Relative molecular mass
79.86 (according to the 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.
Table 2 ?€? Physical and chemical indicators
Appendix A??
Inspection method
WARNING: Some reagents, which are used in the test method, are toxic,
corrosive and flammable. The operator shall be careful! If necessary, it
shall be carried out 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.
When flammable products are used, it is strictly forbidden to use an open
flame for heating.
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 solution
used in the test, 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 Sulfuric acid.
A.2.1.2 30% hydrogen peroxide.
A.2.2 Identification method
Weigh about 0.5 g of the sample; place it in a 250 mL beaker; add 5 mL of
sulfuric acid; slowly heat it until the sulfuric acid appears to smoke; cool. Use
water to carefully dilute to 100 mL slowly; filter. Then, take 5 mL of the filtrate;
add a few drops of 30% hydrogen peroxide; the filtrate appears orange-red.
A.3 Determination of titanium dioxide content
Weigh 0.20 g ?? 0.01 g of the sample that is dried according to A.4, accurate to
0.000 1 g; other operations are the same as those in 7.1 of GB/T 1706-2006.
A.4 Determination of loss on drying
Same as 7.2 of GB/T 1706-2006, dry for 3 hours.
A.5 Determination of loss on ignition (on a dry basis)
is burnt to constant mass at 800 ??C ?? 25 ??C; evaporate to dryness on a water
bath; then burn to constant mass at 800 ??C ?? 25 ??C.
A.6.4 Result calculation
Calculate the mass fraction w2 of the hydrochloric acid-dissolved matter
according to Formula (A.2).
Where:
m4 ?€? mass of the residue, in grams (g);
m3 ?€? 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 0.01%.
A.7 Determination of water-soluble matter
A.7.1 Reagents and materials
A.7.1.1 Ammonium carbonate solution: 40 g/L.
A.7.1.2 Water: fresh double-distilled water or deionized water, pH of 6~7.
A.7.1.3 Medium-speed qualitative filter paper.
A.7.2 Instruments and apparatuses
A.7.2.1 Evaporating dish: 150 mL.
A.7.2.2 Electrothermal constant-temperature dry box: The temperature control
range is 105 ??C ?? 2 ??C.
A.7.3 Analysis steps
Weigh about 10 g of the sample, accurate to 0.01 g; place it in a 300 mL beaker;
add 150 mL of water; boil it in an electric furnace and keep it for 5 minutes; after
cooling to room temperature, add 25 mL of ammonium carbonate solution under
constant stirring; let it stand for 10 minutes. If there is no obvious precipitation
in the turbid liquid, add 25 mL of ammonium carbonate solution. Transfer to a
250 mL volumetric flask; use water to dilute to the mark; shake well; pour it into
a 250 mL beaker; leave it for about 2 h until the supernatant is clear; then, filter
the supernatant through a double-layer medium-speed qualitative filter paper.