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GB 28308-2012: National food safety standard -- Food additive -- Vegetable carbon black
GB 28308-2012
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
GB 28308
National Food Safety Standard –
Food Additive – Vegetable Carbon Black
食品添加剂 植物炭黑
ISSUED ON. APRIL 25, 2012
IMPLEMENTED ON. JUNE 25, 2012
Issued by. Ministry of Health of the People's Republic of China
Table of Contents
1 Application Scope ... 3 
2 Chemical Name, Molecular Formula and Relative Molecular Mass ... 3 
3 Technical Requirements ... 3 
Annex A Test Methods ... 5 
Annex A
Test Methods
A.1 General
Unless specified otherwise, all reagents used for this Standard are analytically pure
reagents and the water is water grade 3 specified in GB/T 6682-2008. Unless specified
otherwise, the standard titration solutions used for this Standard and the standard
solutions, preparations and products used for the determination of impurities shall be
prepared in accordance with GB/T 601, GB/T 602 and GB/T 603. The solutions used
in the test refers to aqueous solutions when the solvent is not indicated for the
preparation.
A.2 Identification test
A.2.1 Solubility test
Weigh 0.1 g of sample; add 100 mL of water; shake up and allow to stand for 10 min.
The solution shall show no colour.
Weigh 0.1 g of sample; add 100 mL of cyclohexane; shake up and allow to stand for
10 min. The solution shall show no colour.
A.2.2 Burning test
Heat sample slowly to red without direct firing.
A.3 Determination of loss on drying
A.3.1 Apparatus
A.3.1.1 Weighing bottle. Φ 30 mm ~ 40 mm.
A.3.1.2 Constant temperature drying oven.
A.3.2 Analytical procedure
Weigh about 2 g of sample, accurate to 0.000 1 g; place in a constant weighing bottle
in a constant temperature drying oven at 120°C ± 2°C; dry in the constant drying oven
at 120°C ± 2°C for 4 h; take out sample and cool in a desiccator to room temperature.
A.3.3 Calculation of results
Loss on drying is calculated by mass fraction w1; the value is expressed in %; it is
calculated in accordance with Formula A.1.
A.5.1 Apparatus
A.5.1.1 Porcelain crucible. 30 mL.
A.5.1.2 High-temperature electric furnace.
A.5.2 Analytical procedure
Weigh about 1 g of sample, accurate to 0.000 1 g; place in a crucible burned to
constant weight at 625°C ± 20°C. Place the crucible into a high-temperature electric
furnace at temperature not exceeding 300°C; open the crucible cover; increase
temperature gradually; ash to constant weight at 625°C ± 20°C.
A.5.3 Ash content is calculated by mass fraction w3; the value is expressed in %; it
is calculated in accordance with Formula A.3.
where,
m4 — the value of ash mass, in g;
m5 — the value of sample mass, in g.
The test result is subjected to the arithmetic mean of parallel determination results.
The ratio of the absolute difference obtained from two independent determination
results under repeatable conditions to the arithmetic mean value is not greater than
5%.
A.6 Determination of alkali soluble colour pigments
A.6.1 Reagents and materials
Sodium hydroxide solution. 1 mol/L.
A.6.2 Analytical procedure
Weigh about 2 g of sample, accurate to 0.000 1 g; place in a 100 mL conical flask; add
20 mL of sodium hydroxide solution; heat slowly to boiling; filter after cooling. The
filtrate shall show no colour, i.e. it passes the test.
A.7 Determination of higher aromatic hydrocarbon
A.7.1 Reagents and materials
A.7.1.1 Cyclohexane.
A.7.1.2 Quinine sulfate.