GB 31604.9-2016 PDF English
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| GB 31604.9-2016 | English | 70 |
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Food safety national standard -- Food contact materials and products -- Determination of heavy metals in food simulants
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GB 31604.9-2016: Food safety national standard -- Food contact materials and products -- Determination of heavy metals in food simulants
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB31604.9-2016
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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