GB 31604.2-2016 English PDF (GB31604.2-2016)

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GB 31604.2-2016: Food safety national standard -- Food contact materials and products -- Determination of potassium permanganate consumption
GB 31604.2-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National Food Safety Standard –
Food Contact Materials and Products –
Determination of potassium permanganate consumption
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 ... 4
4 Analytical Procedures ... 5
5 Expression of Analytical Results ... 6
6 Precision ... 7
Foreword
This Standard replaced the determination of potassium permanganate consumption
stipulated in the following standards, such as GB/T 5009.60-2003 Method for Analysis
of Hygienic Standard of Products of Polyethylene, Polystyrene and Polypropyrene for
Food Packaging, GB/T 5009.61-2003 Method for Analysis of Hygienic Standard of
Products of Tripolycyanamide for Food Packaging, GB/T 5009.64-2003 Method for
Analysis of Hygienic Standard of Rubber Sheet (Ring) for Food Use, GB/T 5009.65-
2003 Method for Analysis of Hygienic Standard of Rubber Sealing Ring for Pressure
Cooker for Food Use, GB/T 5009.66-2003 Method for Analysis of Hygienic Standard
of Nipple of a Feeding Bottle, GB/T 5009.67-2003 Method for Analysis of Hygienic
Standard of Product of Polyvinyl Chloride for Food Packaging, GB/T 5009.68-2003
Method for Analysis of Hygienic Standard of Perchlorovinyl-Coating for Inner Wall of
Food Container, GB/T 5009.69-2003 Method for Analysis of Hygienic Standard of
Epoxy Phenolic Coatings for Inner Wall of Food Cans, GB/T 5009.70-2003 Method for
Analysis of Hygienic Standard of Epoxy Coating For Inner Wall of Food Container,
GB/T 5009.79-2003 Hygienic Analytical Method of Rubber Hose for Food Use, GB/T
5009.80-2003 Method for Analysis of Hygienic Standard of Polytetrafluorethylene
Coating for Inner Wall of Food Cotainer, GB/T 5009.98-2003 Method for Analysis of
Hygienic Standard of Unsaturated Polyester Resin and Glass Fibre Reinforced
Products, GB/T 5009.99-2003 Method for Analysis of Hygienic Standard of
Polycarbonate Resin Used as Food Containers and Packaging, GB/T 5009.100-2003
Method for Analysis of Hygienic Standard of Products of Foamed Polystyrene for Food
Packaging.
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
5009.69-2003, GB/T 5009.70-2003, GB/T 5009.79-2003, GB/T 5009.80-2003, GB/T
5009.98-2003, GB/T 5009.99-2003, and GB/T 5009.100-2003, this Standard has the
major changes as follows.
--- Modified the standard name into “National Food Safety Standard on
Determination of Potassium Permanganate Consumption in Food Contact
Materials and Products”;
--- Modified the standard scope;
--- Modified the calculation formula and unit.
National Food Safety Standard –
Food Contact Materials and Products –
Determination of potassium permanganate consumption
1 Scope
This Standard specifies the determination method of potassium permanganate
consumption in food contact materials and products.
This Standard is applicable to the determination of potassium permanganate
consumption in food contact materials and products.
2 Principle
Under acidic condition, use standard potassium permanganate solution to titrate the
sample soaking solution; calculate the potassium permanganate consumption in the
sample according to the volume of titration solution consumed by the sample.
3 Reagents and Materials
Unless otherwise is specified, all reagents used in this method shall be analytically
pure, while the water used shall be Class-II water stipulated in GB/T 6682.
3.1 Reagents
3.1.1 Sulfuric acid (H2SO4).
3.1.2 Potassium permanganate (KMnO4).
3.2 Preparation of reagents
3.2.1 Sulfuric acid solution (1+2). take 100mL of sulfuric acid, carefully add 200mL of
water, then mix evenly.
3.2.2 0.04% potassium permanganate solution. weigh 0.4g of potassium
permanganate, add water dissolved to 1000mL.
3.2.3 Standard oxalic acid solution . prepare, calibrate or
commercialize the products according to GB/T 601.