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GB 31604.23-2016

Chinese Standard: 'GB 31604.23-2016'
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Detail Information of GB 31604.23-2016; GB31604.23-2016
Description (Translated English): Determination of diaminomethylbezen of complex for food packaging material
Sector / Industry: National Standard
Classification of Chinese Standard: X09
Word Count Estimation: 10,159
Date of Issue: 2016-10-19
Date of Implementation: 2017-04-19
Older Standard (superseded by this standard): GB/T 5009.119-2003
Regulation (derived from): State Health and Family Planning Commission Notice No.1516 of 2016

GB 31604.23-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National Food Safety Standard - Food Contact Materials
and Articles - Determination of Diaminomethylbezen in
Complex Food Contact Materials and Articles
食品安全国家标准
食品接触材料及制品 复合食品接触材料中二氨基甲苯的测定
ISSUED ON. OCTOBER 19, 2016
IMPLEMENTED ON. APRIL 19, 2017
Issued by. National Health and Family Planning Commission of the PRC
Table of Contents
Foreword . 3 
1 Scope .. 4 
2 Principles . 4 
3 Reagents and materials .. 4 
4 Instruments and equipment . 5 
5 Analytical procedures . 6 
6 Analysis results expression . 7 
7 Precision. 8 
8 Limits of detection and quantitation . 8 
9 Principles . 8 
10 Reagents and materials. 9 
11 Instruments and equipment . 9 
12 Analytical procedures . 9 
13 Analysis results expression .. 11 
14 Precision .. 11 
15 Limits of detection and quantitation . 11 
Appendix A Chromatograms of diaminomethylbezen standard derivatives . 12 
National Food Safety Standard - Food Contact Materials
and Articles - Determination of Diaminomethylbezen in
Complex Food Contact Materials and Articles
1 Scope
This Standard specifies the method for determination of diaminomethylbezen
of complex for food packaging material.
This Standard applies to the determination of diaminomethylbezen of complex
for food packaging material.
Method I Gas chromatography
2 Principles
USE 4% acetic acid solution to leach the diaminomethylbezen in the sample;
after the leaching solution is cooled and extracted with dichloromethane under
alkaline conditions, ADD heptafluorobutyric anhydride to derivatize; then,
INJECT the derivatives into a gas chromatograph with electron capture detector
for determination; USE retention time to determine the quality, and the external
standard method to quantify.
3 Reagents and materials
Unless otherwise stated, the reagents used in this method are analytically pure.
The water is the Grade III water specified in GB/T 6682.
3.1 Reagents
3.1.1 Dichloromethane (CH2CI2). chromatographically pure.
3.1.2 Tert-butyl methyl ether (C5H12O). chromatographically pure.
3.1.3 Heptafluorobutyric anhydride (C8F14O3). chromatographically pure.
3.1.4 Anhydrous sodium sulfate (Na2SO4).
5 Analytical procedures
5.1 Preparation of samples
5.1.1 Packaging material which does not contain food ever. USE water to wash
for 3 times; DRY it; at 2 mL/cm2, FILL it with acetic acid solution; and heat seal.
5.1.2 Packaging material which contains food ever. SNIP the seal; REMOVE
all the food; USE clean water to rinse until there is no dirt; and USE water to
wash for 3 times; after drying it, at 2 mL/cm2, FILL it with acetic acid solution;
and heat seal.
5.2 Migration test
PUT the above 5.1.1 or 5.1.2 heat-sealed packaging material (The operating
temperature is 60 °C~120 °C) in an oven pre-adjusted to 120 °C±5 °C; KEEP it
at constant temperature for 40 min; TAKE it out and COOL naturally to room
temperature; then SNIP the seal; and REMOVE the extract into a dry beaker;
SET aside.
PUT the packaging material (The operating temperature is less than 60 °C) in
an oven pre-adjusted to 60 °C±5 °C; KEEP it at constant temperature for 2 h;
TAKE it out and COOL naturally to room temperature; then SNIP the seal; and
REMOVE the water into a dry beaker; SET aside.
5.3 Derivatization process
MEASURE 50.0 mL of the sample; PLACE it in a separatory funnel; USE
sodium hydroxide solution to adjust the pH to 8.0; MIX well; and ADD 10 g of
sodium chloride and MIX well; then USE 10 mL of dichloromethane to extract
twice, 5 min each time; LET it stand for 10 min. COMBINE the two extracts;
after being dehydrated with anhydrous sodium sulfate, at 40°C, BLOW nitrogen
until nearly dry; ADD 2 mL of dichloromethane and MIX well; and ADD 100 μL
of heptafluorobutyric anhydride, MIX gently; at room temperature, CARRY out
derivatization reaction for 15 min.
TRANSFER the above reaction solution into a 60 mL separatory funnel; USE 2
mL of dichloromethane to wash the concentration flask several times;
INCORPORATE the washing liquor into the separatory funnel; ADD 5 mL of
sodium bicarbonate solution; gently SHAKE it for 2 min; LET it stand for 5 min;
TRANSFER the dichloromethane layer into a 10 mL test tube; at 40°C, BLOW
nitrogen until nearly dry; USE tert-butyl methyl ether to dissolve and dilute to
5.00 mL; and INJECT it into gas chromatograph for analysis.
5.4 Preparation of standard determination solution of
10 Reagents and materials
Same as those under 3.
11 Instruments and equipment
11.1 Gas chromatography-mass spectrometry.
11.2 Analytical balance. The sensitivity is 0.01 mg and 0.01 g.
11.3 Nitrogen blowing concentrator.
11.4 pH meter. The precision is 0.1.
12 Analytical procedures
12.1 Preparation of samples
Same as that under 5.1.
12.2 Migration test
Same as that under 5.2.
12.3 Derivatization process
Same as that under 5.3.
1......
Related standard:   GB 31604.14-2016  GB 31604.15-2016
   
 
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