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GB 31604.9-2016 PDF English

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GB 31604.9-2016: Food safety national standard -- Food contact materials and products -- Determination of heavy metals in food simulants
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GB 31604.9-201670 Add to Cart Auto, 9 seconds. Food safety national standard -- Food contact materials and products -- Determination of heavy metals in food simulants Valid

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GB 31604.9-2016: Food safety national standard -- Food contact materials and products -- Determination of heavy metals in food simulants


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GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA National Food Safety Standard – Food contact materials and products – Determination of heavy metals in food simulants Issued on. AUGUST 31, 2016 Implemented on. MARCH 1, 2017 Issued by. National Health and Family Planning of China

Table of Contents

Foreword... 3 1 Scope... 4 Method One Direct colorimetric method... 4 2 Principle... 4 3 Reagents and materials... 4 4 Apparatus... 5 5 Analysis steps... 6 6 Expression of analysis results... 6 Method Two Masking interference colorimetric method... 6 7 Principle... 6 8 Reagents and materials... 6 9 Apparatus... 8 10 Analysis steps... 8 11 Expression of analysis results... 8

Foreword

This Standard replaces 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 5009.70-2003 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 5009.98-2003 Method for analysis of hygienic standard of unsaturated polyester resin and glass fibre reinforced product, 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 and other standard replaced by this Standard, the main changes in this Standard are as follows. - modified the standard’s name to “National Food Safety Standard - Food contact materials and products - Determination of heavy metals in food simulants”; - modified the expression of the applicable scope; - modified the expression of principle; - deleted the sampling methods in each previous standard; - deleted the soaking conditions in each previous standard; - modified the expression of analysis results. National Food Safety Standard – Food contact materials and products – Determination of heavy metals in food simulants

1 Scope

This Standard specifies the determination of heavy metals in food simulants (4% acetic acid). The Method One of this Standard applies to the determination of heavy metals of food contact materials and products in food simulants (4% acetic acid). The Method Two of his Standard applies to the determination of heavy metals of food contact rubber products in food simulants (4% acetic acid). Method One Direct colorimetric method

2 Principle

The heavy metal (in terms of lead) in the food simulant test solution obtained by the migration test INTERACTS with sodium sulfide to FORM yellow-brown sulfide in acidic solution and COMPARE with the color of lead standard solution.

3 Reagents and materials

NOTE Unless otherwise stated, the reagents used in this method are of analytical grade and water is Grade Two specified in GB/T 6682. 3.1 Reagents 3.1.1 Sodium sulfide hydrate (Na2S • 9H2O) 3.1.2 Glycerol (C3H8O3) 3.1.3 Glacial acetic acid (CH3COOH) 3.1.4 Nitric acid (HNO3, 60%, mass fraction) 3.2 Preparation of reagents 3.2.1 Nitric acid solution (10%, mass fraction). transfer 16.7 mL of nitric acid (3.1.4); add water to set volume to 100 mL. 3.3 Standard product Lead nitrate [Pb(NO3)2, >98%] or lead standard solution (1 mg of lead per milliliter) certified by the state and awarded the standard material certificate. 3.4 Preparation of standard solution 3.4.1 Lead standard stock solution. accurately weigh 0.1598 g of lead nitrate

4 Apparatus

4.1 Constant temperature oven 4.2 Volumetric flasks. 100 mL, 1000 mL 4.3 Pipettes. 10 mL, 20 mL 4.6 Analytical balances. resolutions of 0.0001 g, 0.1 g

5 Analysis steps

5.1 Sample preparation According to GB 5009.156 National Food Safety Standard--General Principle of Migration Test Pre-treatment Method of Food Contact Materials and Their Products and corresponding national product standard requirements, 5.2 Determination of sample solution Pipet 20 mL of food simulant test solution (5.1) obtained by migration test in the 50 mL color comparison tube; add water to scale. Take another 2 mL of lead standard use solution (3.4.2) into the 50 mL color comparison tube.

6 Expression of analysis results

When the sample color is darker than the color of standard solution, heavy metal migration (in terms of lead) in food contact material and its products > 1 mg/L.

7 Principle

The heavy metal (in terms of lead) in the food simulant test solution obtained by the migration test INTERACTS with sodium sulfide to FORM yellow-brown sulfide in acidic solution and COMPARE with the color of lead standard solution.

8 Reagents and materials

Unless otherwise stated, the reagents used in this method are of analytical grade and water is Grade Two specified in GB/T 6682. 8.1 Reagents 8.1.1 Sodium sulfide hydrate (Na2S • 9H2O) 8.2 Preparation of reagents 8.2.1 Potassium cyanide solution (100 g/L). weigh 10 g (to the nearest of 0.1 g) of potassium cyanide (8.1.3); add water to dissolve; set volume to 100 mL. 8.2.2 Ammonium citrate solution (500 g/L). 8.2.4 Sodium sulfide solution. weigh 15.4 g of sodium sulfide hydrate (8.1.1); add 10 mL of water; use a glass rod to stir till it dissolves; then add 30 mL of glycerol (8.1.5); well mix; store it sealed. The solution can be stored at room temperature for one month. 8.2.5 Food simulant. 4% acetic acid solution (volume fraction). Weigh 40 mL of glacial acetic acid (8.1.6) into a 1 L volumetric flask; add water to set the volume to scale. 8.3 Standard product Lead nitrate [Pb(NO3)2, >98%] or lead standard solution (1 mg of lead per milliliter) certified by the state and awarded the standard material certificate. 8.4 Preparation of standard solution

9 Apparatus

9.1 Constant temperature oven 9.2 Volumetric flasks. 100 mL, 1000 mL 9.5 Measuring tube. 50 mL 9.6 Analytical balances. resolutions of 0.0001 g, 0.1 g

10 Analysis steps

10.1 Sample preparation Samples shall be subjected to migration test by using 4% acetic acid solution (8.2.5) as food simulant so as to obtain food simulant test solution. Store it in a 0°C ~ 4°C refrigerator in the dark. 10.2 Determination of sample solution Pipet 20 mL of food simulant test solution (10.1) obtained by migration test in the 50 mL color comparison tube. Take another 2 mL of lead standard use solution (8.4.2) into the 50 mL color comparison tube. Add 20 mL of 4% acetic acid solution (8.2.5).

11 Expression of analysis results

When the sample color is darker than the color of standard solution, heavy metal migration (in terms of lead) in food contact material and its products > 1 mg/L; ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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