GB 31604.44-2016 PDF in English
GB 31604.44-2016 (GB31604.44-2016) PDF English
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| GB 31604.44-2016 | English | 70 |
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Food contact materials -- Polymer -- Determination of monoethylene glycol and diethylene glycol in food simulants -- Gas chromatography
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Standards related to (historical): GB 31604.44-2016
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GB 31604.44-2016: PDF in English GB 31604.44-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National food safety standard - Food contact materials
and articles - Determination of migration of ethylene
glycol and diethylene glycol
ISSUED ON. OCTOBER 19, 2016
IMPLEMENTED ON. APRIL 19, 2017
Issued by. National Health and Family Planning commission of the
People’s Republic of China
3. No action is required - Full-copy of this standard will be automatically &
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Table of Contents
Foreword ... 3
1 Scope .. 4
2 Principle ... 4
3 Reagents and materials .. 4
4 Apparatus ... 5
5 Analytical procedures ... 6
6 Expression of analytical results ... 8
7 Repeatability ... 8
8 Others ... 8
Annex A Chromatogram of ethylene glycol or diethylene glycol in the standard
working solutions of food simulants .. 9
Foreword
This Standard replaces GB/T 23296.18-2009, Food contact materials - Polymer -
Determination of monoethylene glycol and diethylene glycol in food simulants - Gas
chromatography.
Compared with GB/T 23296.18, the major changes of this Standard are as follows.
-- the standard name is changed into “National food safety standard - Food contact
materials and articles - Determination of migration of ethylene glycol and
diethylene glycol”;
-- the test types for food simulants are added.
National food safety standard - Food contact materials
and articles - Determination of migration of ethylene
glycol and diethylene glycol
1 Scope
This Standard specifies the gas chromatographic method for the determination of
migration of ethylene glycol and diethylene glycol in food contact materials and articles.
This Standard applies to the determination of migration of ethylene glycol and
diethylene glycol in food contact materials and articles.
2 Principle
Use the capillary gas chromatographic column to separate ethylene glycol and
diethylene glycol in food containers and packaging materials; and use the hydrogen
flame ionization detector for determination. Analyze sample directly for water-base,
acidic and alcoholic food simulants; analyze sample of oil-base food simulants after
water extraction; use the internal standard method for quantitation, with 1,4-butanediol
as the internal standard substance.
3 Reagents and materials
Unless specified otherwise, all reagents are analytically pure reagents and all water is
grade I water which is specified in GB/T 6682. Plastic material shall be avoided in the
production of the containers and transferring vessels in the test.
3.1 Reagents
3.1.1 Glacial acetic acid (C2H4O2).
3.1.2 Absolute ethyl alcohol (C2H6O).
3.1.3 Methyl alcohol (CH4O).
3.1.4 Normal heptane (C7H16).
3.1.5 Reagents required for the preparation of water-base, acidic, alcoholic and oil-
base food simulants. as specified in GB 31604.1.
3.2 Preparation of reagents
4.4 Volumetric flasks. 25 ml, 50 mL and 100 mL.
4.5 Graduated pipettes. 1 mL and 2 mL.
4.6 Glass injection syringe. 50 mL.
4.7 Filter. 0.22 μm organic phase filter membrane, needle type.
5 Analytical procedures
5.1 Preparation of standard working solutions and samples
5.1.1 Preparation of standard working solutions
5.1.1.1 Standard working solutions of water-base, acidic and alcoholic food simulants
Accurately absorb 1 mL of standard intermediate solutions of all concentrations
respectively to pour into six 50 mL volumetric flasks; add water dropwise to scale; and
then obtain the standard working solutions of the concentrations of ethylene glycol and
diethylene glycol in water 0.0 mg/L, 3.0 mg/L, 6.0 mg/L, 15.0 mg/L, 30.0 mg/L and 60.0
mg/L. Use the same method and use the corresponding water-base, acidic and
alcoholic food simulants to prepare the same concentration series of standard working
solutions of ethylene glycol and diethylene glycol.
5.1.1.2 Standard working solutions of oil-base food simulants
Accurately weigh 50 g (accurate to 0.1 g) of oil-base food simulants to pour into six
250 mL separating funnels; add in succession 1 mL of the standard intermediate
solutions of all concentrations; mix up; and obtain the oil-base food simulants of the
concentrations of ethylene glycol and diethylene glycol 0.0 mg/L, 3.0 mg/L, 6.0 mg/L,
15.0 mg/L, 30.0 mg/L and 60.0 mg/L. Add 50 mL of heptane to every separating funnel;
mix up; add water for oscillation extraction for 1 min; allow to stand for 5 min; and
separate two phases into layers. Collect the lower water phase. And use 20 mL of
water to extract oil-base food simulants once again. Combine the water for the two
extractions; and add water dropwise to 50 mL. Take 1 mL of the solution to pass
through a 0.2 μm filter membrane before using it for the determination.
5.1.2 Preparation of food simulants’ test solution
5.1.2.1 General
In accordance with the intended use and working conditions of samples to be tested,
operate in accordance with the migration test methods and test conditions which are
specified in GB 5009.156 and GB 31604.1. After the migration test, mix up all the
simulants which are obtained in the migration test and take part for the analysis.
The simulants obtained from the migration test may be stored in a refrigerator in a dark
Measure the standard working solutions prepared in 5.1.1 under the listed instrument
parameters; plot the standard working curve, using the mass concentration of ethylene
glycol or diethylene glycol as the abscissa, and using the corresponding ratio of the
chromatographic peak area of ethylene glycol or diethylene glycol to that of the internal
standard substance 1,4-butanediol; and obtain the linear equation. For the standard
chromatogram see Annex A.
5.2.3 Quantitative determination
Inject samples of food simulants’ test solutions and blank solutions in succession; and
obtain respectively the corresponding ratios of the chromatographic peak area of
ethylene glycol or diethylene glycol to that of the internal standard substance 1,4-
butanediol. Obtain the contents of ethylene glycol or diethylene glycol in the sample
solutions in accordance with the standard curve, deducting the blank values.
6 Expression of analytical results
In accordance with the concentrations of ethylene glycol and diethylene glycol in the
sample solutions which are obtained from the standard curve, calculate the migration
volume as specified in GB 5009.156; and obtain the migrations of ethylene glycol and
diethylene glycol in food simulants and products. The results shall be rounded off to
the third decimal place.
7 Repeatability
The absolute difference between the results of two independent measurements under
repeatable conditions shall not exceed 10% of the arithmetic mean value.
8 Others
The limit of quantitation of this method for ethylene glycol or diethylene glycol in water-
base, acidic and alcoholic food simulants is 3 mg/L.
The limit of quantitation of this method for ethylene glycol or diethylene glycol in oil-
base food simulants is 3 mg/kg.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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