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GB 31604.8-2016 English PDF (GB31604.8-2016)

GB 31604.8-2016 English PDF (GB31604.8-2016)

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GB 31604.8-2016: Food safety national standard -- Food contact materials and products -- Determination of total migration

This Standard specifies the method for the determination of total migration in food contact materials and products. This Standard applies to the determination of total migration in food contact materials and products. It does not apply to the determination of total migration in food simulants of vegetable oils.
GB 31604.8-2016
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
National Food Safety Standard ?€? Food Contact Materials
and Products ?€? Determination of Total Migration
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ISSUED ON. AUGUST 31, 2016
IMPLEMENTED ON. MARCH 1, 2017
Issued by. National Health and Family Planning Commission of China
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Principle ... 4
3 Reagents and Materials (Food Simulants) ... 4
4 Apparatus ... 4
5 Analytical Procedure ... 5
6 Expression of Analytical Results ... 6
7 Accuracy ... 8
Foreword
This Standard replaces the determination of residue after evaporation in GB/T 5009.60-2003, Method for analysis of hygienic standard of products of polyethylene, polystyrene and polypropyrene for food packaging, residue after evaporation in GB/T 5009.61-2003, Method for analysis of hygienic standard of products of
tripolycyanamide for food packaging, residue after evaporation in GB/T 5009.64-2003, Method for analysis of hygienic standard of rubber sheet (ring) for food use, residue after evaporation in GB/T 5009.65-2003, Method for analysis of hygienic standard of rubber sealing ring for pressure cooker for food use, residue after evaporation in GB/T 5009.66-2003, residue after evaporation in GB/T 5009.67-2003, Method for analysis of hygienic standard of product of polyvinyl chloride for food packaging, residue after evaporation in GB/T 5009.68-2003, Method for analysis of hygienic standard of perchorovinyl-coating for inner wall of food container, residue after evaporation in GB/T 5009.69-2003, Method for analysis of hygienic standard of epoxy phenolic coatings for inner wall of food cans, residue after evaporation in GB/T 5009.70-2003, Method for analysis of hygienic standard of epoxy coating for inner wall of food container, residue after evaporation in GB/T 5009.79-2003, Hygienic analytical method of rubber hose for food use, residue after evaporation in GB/T 5009.80-2003, Method for analysis of hygienic standard of polytetrafluorethylene coating for inner wall of food container, residue after evaporation in GB/T 5009.98-2003, Method for analysis of hygienic standard of unsaturated polyester resin and glass fiber reinforced products for food containers and packaging materials, residue after evaporation in GB/T 5009.100-2003, Method for analysis of hygienic standard of products of foamed polystyrene for food packaging and GB/T 5009.203-2003, Methods of analysis for the evaporated residues in the hygienic standard of food containers of plant fiber origin.
Compared with GB/T 5009.60-2003, GB/T 5009.61-2003, GB/T 5009.64-2003, GB/T 5009.65-2003, GB/T 5009.66-2003, GB/T 5009.67-2003, GB/T 5009.68-2003, GB/T 5009.69-2008, GB/T 5009.70-2003, GB/T 5009.79-2003, GB/T 5009.80-2003, GB/T 5009.98-2003, GB/T 5009.100-2003 and GB/T 5009.203-2003, the main changes of this Standard are as follows.
-- it changes the name of the standard into ?€?National Food Safety Standard ?€? Food Contact Materials and Products ?€? Determination of Total Migration?€?;
-- it changes the application scope of the standard; and
-- it changes the calculation equation and unit.
National Food Safety Standard ?€? Food Contact Materials
and Products ?€? Determination of Total Migration
1 Scope
This Standard specifies the method for the determination of total migration in food contact materials and products.
This Standard applies to the determination of total migration in food contact materials and products. It does not apply to the determination of total migration in food simulants of vegetable oils.
2 Principle
Use different kinds of food simulants to soak the sample; evaporate and dry the soak solution; and then obtain the total quantity of non-volatile matter of the sample migrating to the soak solution.
3 Reagents and Materials (Food Simulants)
Unless specified otherwise, all reagents used for this method are guaranteed reagents and the water is water grade II specified in GB/T 6682.
3.1 Reagents
3.1.1 Food simulants. handled as specified in GB 31604.1.
3.1.2 Trichloromethane (CHCl3).
3.2 Preparation of reagents
Preparation of food simulants. handled as specified in GB 5009.156.
4 Apparatus
4.1 Balance. sensitivity 0.1 mg.
4.2 Electrothermal constant-temperature drying oven.
4.3 Glass evaporating dish. volume 50 mL.
V1 ?€? volume of the soak solution for the determination, in mL;
S ?€? contacting area between the sample and the soak solution, in dm2; and When the total migration in the sample is calculated in accordance with the actual use, it is calculated in accordance with the following equation.
where
X5 ?€? total migration of the sample calculated in accordance with actual use, in mg/L or mg/kg;
X4 ?€? total migration of the sample, in mg/dm2;
S2 ?€? contacting area of the actual packaging of the sample, in dm2;
V2?€? contacting volume or mass of the actual packaging of the sample, in mL or g; and 1 000 ?€? conversion coefficient.
The calculation result is expressed as the arithmetic mean value of the results obtained from two independent determinations under repeatable conditions, and rounded off to 2 significant digits.
7 Accuracy
The absolute difference between the results obtained from two independent determinations under repeatable conditions shall not exceed 20% of the arithmetic mean value.

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