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GB 31604.16-2016National food safety standard - Food contact materials and articles - Determination of styrene and ethylbenzene (English PDF)

食品安全国家标准食品接触材料及制品苯乙烯和乙苯的测定

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Issued by

National Health and Family Planning Commission of the PRC 3. No action is required - Full-copy of this standar

Level / Type

National · Mandatory

Issue date

October 19, 2016

Implementation date

April 19, 2017

Scope

GB 31604.16-2016 is the English-translated version of 食品安全国家标准食品接触材料及制品苯乙烯和乙苯的测定.

GB 31604.16-2016 — This Standard specifies the gas chromatography method for determination of styrene and ethylbenzene in food contact materials and articles. This Standard applies to the determination of styrene and ethylbenzene in polystyrene products, unsaturated polyester resin, and its glass fiber reinforced plastic products.

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Document preview — GB 31604.16-2016

National Standard of the People's Republic of China

Issued by: National Health and Family Planning Commission of the PRC 3. No action is required - Full-copy of this standar

1 Scope ..4
2 Principles...4
3 Reagents and materials ..4
4 Instruments and equipment...6
5 Analytical procedures...6
6 Analysis results expression...8
7 Precision...8
8 Others...9
Appendix A Gas chromatogram of the standard solution...10

Foreword

This Standard replaces "Part 4.4 - Ethylbenzene compounds" of GB/T 5009.98-

2003 "Method for analysis of hygienic standard of unsaturated polyester resin

and glass fibre reinforced plastics used as food containers and packaging

materials", "Part 6 - Styrene, ethylbenzene, and other volatile components" of

GB/T 5009.59-2003 "Method for analysis of hygienic standard of polystyrene

resin for food packaging".

As compared with "Part 6 - Styrene, ethylbenzene, and other volatile

components" of GB/T 5009.59-2003, the main changes of this Standard are as

follows.

- CHANGE the Standard's name to "National Food Safety Standard - Food

contact materials and articles - determination of styrene and ethylbenzene";

- MODIFY the type of chromatographic column;

- ADD the method for determination of insoluble samples.

National Food Safety Standard -

Food contact materials and articles -

determination of styrene and ethylbenzene

1 Scope

This Standard specifies the gas chromatography method for determination of

styrene and ethylbenzene in food contact materials and articles.

This Standard applies to the determination of styrene and ethylbenzene in

polystyrene products, unsaturated polyester resin, and its glass fiber reinforced

plastic products.

2 Principles

After extracting the sample with carbon disulfide, INJECT the sample into gas

chromatography. Styrene, ethylbenzene, internal standard n-dodecane, and

other components are separated in the chromatographic column. USE

hydrogen flame ionization detector to detect; and USE internal standard method

to quantify.

3 Reagents and materials

3.1 Reagent

Carbon disulfide (CS2, CAS Number. 75-15-0). chromatographically pure.

3.2 Standards

3.2.1 Styrene (C8H8, CAS Number. 100-42-5). The purity shall be greater than

99.5%. Or the reference material certified by the state and awarded a Certificate

of Reference Material.

3.2.2 Ethylbenzene (C8H10, CAS Number. 100-41-4). The purity shall be greater

than 99.5%. Or the reference material certified by the state and awarded a

Certificate of Reference Material.

3.2.3 N-dodecane (C12H26, CAS Number. 112-40-3). The purity shall be greater

than 99%. Or the reference material certified by the state and awarded a

Certificate of Reference Material.

5 mL of carbon disulfide; then ADD 1.0 mL of internal standard intermediate

solution of n-hexane into each volumetric flask; USE carbon disulfide to dilute

them; and SHAKE well to obtain a working solution. The concentration of

styrene and ethylbenzene is 1.0 µg/mL, 5.0 µg/mL, 10.0 µg/mL, 20.0 µg/mL,

50.0 µg/mL, 100.0 µg/mL, respectively. The internal standard concentration is

50 µg/mL. The storage conditions of the solution are the same as those under

3.3.1.

4 Instruments and equipment

4.1 Gas chromatograph. Equipped with hydrogen flame ionization detector

(FID).

4.2 Analytical balance. sensitivity is 0.0001 g.

4.3 Ultrasonic cleaning machine.

4.4 Cryogenic lapping instrument.

4.5 Conical flask. 25 mL.

5 Analytical procedures

5.1 Sample processing

The samples that are soluble in carbon disulfide shall be weighed directly. The

samples that are insoluble in carbon disulfide shall be first crushed by cutting

tools such as a cryogenic lapping instrument or scissors, and then weighed

after being smaller than 1 mmX1 mm. When cutting a sample, do not heat or

soften it.

5.2 Preparation of sample solution

For samples that are soluble in carbon disulfide, WEIGH 0.5 g (accurate to

0.001 g) of the sample into a 25 mL volumetric flask; TRANSFER 10 mL of

carbon disulfide to the volumetric flask and ADD 1.0 mL of internal standard

intermediate solution. Let stand until the sample is dissolved, USE carbon

disulfide to dilute it to volume. For samples that are insoluble in carbon disulfide,

WEIGH 0.5 g (accurate to 0.001 g) of the sample into a 25 mL conical flask and

TRANSFER 10 mL of carbon disulfide to the conical flask. After capping, USE

an ultrasonic cleaning machine to extract for 20 min and TAKE the supernatant

into a 25 mL volumetric flask. Then, by the same method, USE 10 mL of carbon

disulfide to extract again; COMBINE the two supernatants in the 25 mL

volumetric flask; and ADD 1.0 mL of internal standard intermediate solution to

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 10 pages — is available in the English PDF.

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