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GB 31604.36-2016National food safety standard - Food contact materials and products - Determination of creosote in cork (English PDF)

食品安全国家标准食品接触材料及制品软木中杂酚油的测定

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Issued by

National Health and Family Planning Commission of People's Republic of China

Level / Type

National · Mandatory

Issue date

October 19, 2016

Implementation date

April 19, 2017

Scope

GB 31604.36-2016 is the English-translated version of 食品安全国家标准食品接触材料及制品软木中杂酚油的测定.

GB 31604.36-2016 — This standard specifies the gas chromatography-mass spectrometry method for the determination of creosote in cork for food contact materials.

This standard is applicable to the determination of creosote in cork for food contact materials.

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Document preview — GB 31604.36-2016

National Standard of the People's Republic of China

Issued by: National Health and Family Planning Commission of People's Republic of China

Foreword .3
1 Scope ..4
2 Principle..4
3 Reagents and materials ..4
4 Instruments and equipment .5
5 Analytical steps .5
6 Expression of the analytic result ..6
7 Precision.7
8 Others .7

Foreword

This standard replaces SN/T 2828-2011 "Food contact materials for export.

Wood materials. Determination of cresol in cork. Gas chromatography-mass

spectrometry method".

Compared with SN/T 2828-2011, the main differences of this standard are as

follows.

- Changed the name of the standard to "National Food Safety Standard -

Food contact materials and products -Determination of creosote in cork";

- Replaced single point method to standard curve method for quantitative

method.

National Food Safety Standard -

Food contact materials and products -

Determination of creosote in cork

1 Scope

This standard specifies the gas chromatography-mass spectrometry method for

the determination of creosote in cork for food contact materials.

This standard is applicable to the determination of creosote in cork for food

contact materials.

2 Principle

Extract the creosote in the sample by Soxhlet extractor with absolute ethyl

alcohol, concentrate the extracted solution and the meter volume. Filter the

extracted solution by 0.45µm organic microporous membrane, then determine

by gas chromatography-mass spectrometry (GC-MS). Use retention time for

qualitative determination and external standard method for quantitative

determination.

3 Reagents and materials

Unless otherwise stated, the reagents used in this method all shall be analytical

pure. The water shall be the primary water specified in GB/T 6682.

3.1 Reagents

Absolute ethyl alcohol (CH3CH2OH).

3.2 Standard substance

Standard creosote. purity no less than 98%, see appendix A.

3.3 Preparation of standard solutions

3.3.1 Preparation of standard reserve solution

Prepare the standard reserve solution 100 µg/mL with absolute ethyl alcohol.

3.3.2 Preparation of standard working solution

Dilute the standard reserve solution into 0.01µg/mL, 0.02µg/mL, 0.05µg/mL,

0.1µg/mL and 0.2µg/mL of standard working solution with absolute ethyl alcohol.

Or make standard working solution with suitable concentration as required.

Note. The valid period for standard solution stored in 0~4°C refrigerator is 6 months.

4 Instruments and equipment

4.1 Gas chromatography-mass spectrometry.

4.2 Soxhlet extractor. 150mL.

4.3 Rotary evaporator.

4.4 Cutting grinder.

4.5 Organic microporous membrane. pore diameter 0.45µm.

5 Analytical steps

5.1 Sample preparation

Take appropriate amount of cork sample, cut and ground into powder with

diameter less than 1mm by cutting and grinding machine, fully mix and store in

a closed container avoiding light.

5.2 Sample extraction

Weigh accurately 2g of sample (accuracy to 1mg), put in the cylinder of 150mL

Soxhlet extractor and add 80mL of absolute ethyl alcohol into round-bottom

flask. Exact at 80°C and 95°C for 4 hours with the reflux no less than 4 times in

1 hour. After cooling, evaporate with rotating evaporator at 50°C until about 5

mL is left. Then transferred and meter to 10 mL with absolute ethyl alcohol.

Filter by organic filter membrane and wait for determination by gas

chromatography-mass spectrometry (GC-MS).

5.3 Determination

5.3.1 Instrument reference condition

5.3.1.1 Gas chromatography-mass spectrometry reference condition

The following parameters are available for reference, see Appendix B for

example.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 7 pages — is available in the English PDF.

Referenced standards

Cited by

GB/T 41713-2022Wood dust or scrap and wood pellets

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