GB 31604.17-2016 PDF English
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National food safety standard - Food contact materials and articles - Determination of the content and migration of acrylonitrile
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GB 31604.17-2016: National food safety standard - Food contact materials and articles - Determination of the content and migration of acrylonitrile
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National food safety standard –
Food contact materials and articles –
Determination of the content and migration of acrylonitrile
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 Principle.. 4
3 Reagents and materials .. 4
4 Instruments and equipment . 5
5 Analytical procedures . 5
6 Expression of analysis results .. 7
7 Precision. 7
8 Others . 8
9 Principle.. 8
10 Reagents and materials. 8
11 Instruments and equipment . 9
12 Analytical procedures . 9
13 Expression of analysis results . 11
14 Precision .. 11
15 Others . 11
Appendix A Acrylonitrile gas chromatogram .. 12
Foreword
This standard replaces GB/T 5009.152-2003 “Determination of residual
acrylonitrile monomer in styrene-acrylonitrile copolymers and rubber-modified
acrylonitrile-butadiene-styrene resins and their products used for foods pack”
and GB/T 23296.8-2009 “Food contact materials - Polymer - Determination of
acrylonitrile in food simulants - Gas chromatography” and SN/T 2197-2008
“Food contact materials - Polymer materials - Determination of acrylonitrile in
food and food simulants - Gas chromatography”.
As compared with GB/T 5009.152-2003, the main changes of this standard are
as follows.
- CHANGE the standard name into “National food safety standard - Food
contact materials and articles - Determination of the content and migration
of acrylonitrile”;
- DELETE the gas chromatography-hydrogen flame detector method,
RETAIN the gas chromatography-nitrogen phosphorus detector method;
- ADD the determination of the migration of acrylonitrile in food contact
materials and articles.
National food safety standard –
Food contact materials and articles –
Determination of the content and migration of acrylonitrile
1 Scope
This standard specifies the method for determination of the content and
migration of acrylonitrile in food contact materials and articles.
This standard applies to the determination of the content and migration of
acrylonitrile in food contact materials and articles.
Determination of acrylonitrile
2 Principle
The food contact materials and articles are dissolved or dispersed in a
headspace flask via N,N-dimethylformamide, heated to allow the components
to be tested to reach a gas-liquid equilibrium, then the top air is quantitatively
sucked for gas chromatographic determination. The retention time is based for
qualitative determination, the propionitrile is used as internal standard, the
internal standard method is used for quantitative determination.
3 Reagents and materials
The water used in this method is grade I water specified in GB/T 6682.
Containers and transfer apparatus used in the test shall avoid the use of plastic
materials.
3.1 Reagents
N,N-dimethylformamide (DMF). analytically pure, no interference peaks at the
retention times of acrylonitrile and propionitrile.
3.2 Standard substance
3.2.1 Acrylonitrile (C3H3N, CAS No.. 107-13-1). 1000 μg/mL, or a standard
substance that is certified by the state and granted a standard substance
certificate.
to add 200 μL of propionitrile standard solution into the headspace flask,
SHAKE it thoroughly, to make the specimen in the flask is completely dissolved
or dispersed, PREPARE for the determination. Meanwhile MAKE blank test.
5.3 Instrument reference conditions
5.3.1 Headspace sample injector conditions
Headspace sample injector conditions are listed below.
a) Balance time. 30 min;
b) Furnace temperature. 80 °C;
c) Pressure. 138 kPa;
d) Pressurization time. 2 min;
e) Injection time. 0.04 min;
f) Transmission line temperature. 85 °C.
5.3.2 Gas chromatographic conditions
Gas chromatographic conditions are listed below.
a) Column. cross-linked polyethylene glycol stationary phase capillary
column, column length 30 m, inner diameter 0.32 mm, film thickness 0.25
μm, or equivalent column;
b) Column temperature program. 40 °C maintained for 4 min, 10 °C/min to
70 °C maintained for 1 min, 15 °C/min increased to 170 °C;
c) Inlet temperature. 150 °C;
d) Detector temperature. 280 °C;
e) Carrier gas nitrogen flow rate. 50 mL/min;
f) Hydrogen flow rate. 1.5 mL/min;
g) Air flow rate. 145 mL/min;
h) Sample inlet constant pressure injection. 100 kPa.
5.4 Calibration solution preparation and calibration curve making
TAKE 5 headspace flasks, respectively ADD 200 μL of propionitrile standard
solution, then ADD acrylonitrile series standard solutions in sequence. At this
time, the acrylonitrile contents in the calibration solution correspond to 2.0 μg,
obtained food simulant test solution shall be cooled or returned to room
temperature before the next test.
12.1.3 Immersion solution treatment
The food simulant preparation process refers to GB/T 5009.156. USE a 5 mL
pipette to pipette 5.0 mL of food simulant into a headspace flask, accurately
WEIGH the transferred liquid mass. Immediately CAP to seal it, USE a 100 μL
micro-syringe to add 100 μL of N,N-dimethylformamide and 100 μL of
propionitrile standard solution into the headspace flask, MIX it uniformly,
PREPARE for determination. Meanwhile MAKE blank test.
12.2 Instrument reference conditions
12.2.1 Headspace sample injection conditions
Headspace sample injector conditions are listed below.
a) Balance time. 30 min;
b) Furnace temperature. 80 °C;
c) Pressure. 138 kPa;
d) Pressurization time. 2 min;
e) Injection time. 0.04 min;
f) Transmission line temperature. 85 °C.
12.2.2 Gas chromatographic conditions
Gas chromatographic conditions are listed below.
a) Column. Cross-linked polyethylene glycol stationary phase capillary
column, column length 30 m, inner diameter 0.32 mm, film thickness 0.25
μm, or equivalent column;
b) Column temperature program. 40 °C maintained for 4 min, 10 °C/min
increased to 70 °C which is maintained for 1 min, 15 °C/min increased to
170 °C;
c) Sample inlet temperature. 150 °C;
d) Detector temperature. 280 °C;
e) Carrier gas nitrogen flow rate. 50 mL/min;
f) Hydrogen flow rate. 1.5 mL/min;
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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