GB 25577-2010National food safety standards of food additives titanium dioxide (English PDF)

3.1 Molecular formula

TiO2

3.2 Relative molecular mass

79.87 (According to the international relative atomic weight in 2007)

4.1 Sensory requirements

Sensory requirements shall comply with the requirements of Table 1.

Appendix A

(Normative)

Testing method

A.1 Warnings

Some reagents used in this Standard's test method are toxic or corrosive. It must be careful

when performing the operation! If it is splashed onto the skin, the skin shall be washed with

water immediately. Severe cases shall be treated immediately.

A.3 Identification test

Take approximate 0.5g of the sample. Add 5mL of the sulfuric acid. Perform heating slowly

until the sulfuric acid appears smog; cool it down. Carefully dilute it to 100mL with water

AND; filter it. Then take approximate 5mL of the filter liquor. Add a few drops of the test

solution -- hydrogen peroxide. The filter liquor appears orange red.

A.4 Determination of titanium dioxide - Aluminum reduction method

Weigh 0.20g±0.01g of the sample which has been dried, according to A.5.The accuracy

is 0.0001g. Other operations are the same as the 7.1 of GB/T 1706-2006.

A.5 Determination of the loss on drying

Same as the 7.2 of GB/T 1706-2006.Dry for 3 hours.

A.6 Determination of the loss on ignition

A.6.1 Instruments and equipment

High temperature furnace. it can be controlled at 800°C±25°C.

A.6.2 Analytical procedures

Weigh approximate 2g of the sample which has been dried, according to A.5.The accuracy

is 0.0001g. Place it into the porcelain crucible which can be ignited to the constant mass.

Ignite it to the constant mass at 800°C±25°C in the high temperature furnace.

A.7 Determination of hydrochloric acid lysate

A.7.1 Reagents and materials

Hydrochloric acid solution. 1+19.

A.7.2 Analytical procedures

Weigh approximate 5g of the sample. The accuracy is 0.01g. Place it into the 250mL beaker.

Add 100mL of the hydrochloric acid solution. Mix it evenly. Perform heating on the water

bath for 30min. Filter it. Wash the filter residue for 3 times with the hydrochloric acid solution;

use 10mL for each time. Place the filter liquor and the washing solution into the crucible

which can perform ignition until the constant mass under 800°C±25°C. Evaporate it till

dryness. And then, ignite it till the constant mass under 800°C±25°C.

Same as the 7.3 of GB/T 1706-2006.

A.9 Determination of heavy metals

A.9.1 Reagents and materials

A.9.1.1 Hydrochloric acid solution. 1+19.

A.9.1.2 Others are the same as the Chapter 3 of GB/T 5009.74-2003.

A.9.2 Instruments and equipment

Same as the Chapter 4 of GB/T 5009.74-2003.

A.10 Determination of arsenic

Remove 4.00mL of the sample solution A (A.9.3) and 2mL of the arsenic standard solution

(1mL of the solution contains 0.001mg of As) for the determination. Other operations shall

be the same as GB/T 5009.76-2003.

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