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GB 31604.20-2016

Chinese Standard: 'GB 31604.20-2016'
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GB 31604.20-2016English70 Add to Cart 0--10 minutes. Auto immediate delivery. Food contact materials-Polymer materials-Determination of vinyl acetate in food stimulants by gas chromatography/mass spectrometry Valid GB 31604.20-2016
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Detail Information of GB 31604.20-2016; GB31604.20-2016
Description (Translated English): Food contact materials-Polymer materials-Determination of vinyl acetate in food stimulants by gas chromatography/mass spectrometry
Sector / Industry: National Standard
Classification of Chinese Standard: X09
Word Count Estimation: 8,816
Date of Issue: 2016-10-19
Date of Implementation: 2017-04-19
Older Standard (superseded by this standard): SN/T 2333-2009
Regulation (derived from): State Health and Family Planning Commission Notice No.1516 of 2016

GB 31604.20-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National food safety standard -
Food contact materials and products -
Determination of vinyl acetate migration quantity
食品安全国家标准
食品接触材料及制品 醋酸乙烯酯迁移量的测定
ISSUED ON. OCTOBER19, 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 Instrument and equipment .. 5 
5 Analytical procedures .. 5 
6 Analysis results expression . 7 
7 Confirmatory test .. 7 
8 Precision . 7 
9 Others .. 7 
Appendix A Vinyl acetate gas chromatogram .. 8 
Appendix B Gas chromatography-mass spectrometry confirmation reference
conditions .. 9 
Appendix C Vinyl acetate chromatography-mass spectrometry diagram .. 11 
National food safety standard -
Food contact materials and products -
Determination of vinyl acetate migration quantity
1 Scope
This standard specifies determination method of vinyl acetate migration
quantity in food contact materials and products.
This standard applies to determination of vinyl acetate migration quantity in food
contact materials and products.
2 Principles
In the sample, after the vinyl acetate is leached from the food simulation soaking
solution, use acetone to dilute it, and finally use gas chromatography to
determine and external standard method to quantify. Once the sample is
detected, it must be confirmed by gas chromatography - mass spectrometry.
3 Reagents and materials
Unless otherwise indicated, the reagents used in this method are analytical
grade, the water is the grade-1 water specified in GB/T 6682. The containers
and transfer apparatuses in the test shall avoid using plastic materials.
3.1 Reagents
3.1.1 Acetone (C3H6O). It does not contain vinyl acetate.
3.1.2 Methanol (C2H4O).
3.1.3 Water-based, acidic, alcoholic, oil-based food simulants. The reagents
used are in accordance with the provisions of GB 31604.1.
3.2 Reagent preparation
3.2.1 Water-based, acidic, alcoholic, oil-based food simulants. Operate
according to GB 5009.156.
5.2 Preparation of standard working solution of food simulants that are
water-based, acidic food, alcoholic, and oil-based
Accurately PIPETTE 0 mL, 0.01 mL, 0.05 mL, 0.1 mL, 0.5 mL, 1.0 mL of vinyl
acetate standard intermediate solution into 10 mL volumetric flask; USE
acetone to dilute it; OBTAIN standard working solution with vinyl acetate
concentration of 0.00 mg/L, 0.1 mg/L, L, 0.5 mg/L, 1.0 mg/L, 5.0 mg/L, 10.0
mg/L, respectively. In the same way, OBTAIN standard working solution of food
simulants that are water-based, acidic food, alcoholic, and oil-based.
5.3 Gas chromatograph (GC) reference conditions
The GC reference conditions are listed below.
a) Chromatographic column. DB-5 quartz capillary column, column length 30
m, inner diameter 0.32 mm, film thickness 0.25 μm, or equivalent;
b) Temperature programming. 35 °C (keep for 5 min), rising from 5 °C/min to
50 °C, rising from 40 °C/min to 250 °C (keep for 2 min);
c) Inlet temperature. 250 °C;
d) Injection mode. split injection (10.1), injection volume is 1 μL;
e) Detector temperature. 300 °C;
f) Carrier gas (N2) flow rate. 0.5 mL/min;
g) Hydrogen flow rate. 30 mL/min;
h) Air flow rate. 400 mL/min.
5.4 Determination
5.4.1 Sample determination
TAKE a clean and dry 25 mL volumetric flask; ADD 1 g (accurate to 0.0001 g)
of simulated food soaking solution after migration experiment; USE acetone to
dilute it to the mark; MIX it uniformly for spare-use. USE micro-syringe to pipette
respectively a certain amount of the above test solution; INJECT it into gas
chromatograph. According to the above gas chromatographic conditions,
REPEAT the determination twice. The gas chromatogram of vinyl acetate is
shown in Figure A.1.
5.4.2 Blank Test
Blank test refers to, except for not adding sample, use exactly the same
analytical procedure, reagents and dosage, carry out parallel operation.
Appendix B
Gas chromatography-mass spectrometry confirmation reference
conditions
B.1 Gas chromatographic conditions
The gas chromatographic conditions are listed below.
a) Chromatographic column. Capillary column. DB-5 ms 30 m × 0.25 mm
(inner diameter) × 0.25 μm, or equivalent;
b) Temperature programming. 30 °C (keep for 4 min), rising from 5 °C/min to
50 °C, rising from 40 °C/min to 250 °C (keep for 2 min);
c) Inlet temperature. 250 °C;
d) GC-MS interface temperature. 280 °C;
e) Carrier gas (He). 0.55 mL/min;
f) Injection mode. split injection, split ratio is 10.1.
B.2 Mass Spectrometry Conditions
The mass spectrometry conditions are listed below.
a) Ion source temperature. 230 °C;
b) Quadrupole rod temperature. 150 °C;
c) Ion sou......
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