GB 31604.35-2016National food safety standard - Food contact materials and products - Determination of caprolactam and migration quantity (English PDF)

Foreword

This standard replaces GB/T 23243-2009 "Determination of perfluorooctane

sulfonates (PFOS) in the food packaging material - High performance liquid

chromatography-tandem mass spectrometry".

The main technical differences of this standard in comparison with GB/T 23243-

2009 are as follows.

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

- Food contact materials and products - Determination of perfluorooctane

sulfonate (PFOS) and perfluoro caprylic acid (PFOA)";

- Added scope of application of the standard;

- Added the content of determination object PFOA;

- Added the method of sample preparation;

- Added the purification step. Use the weak anion exchange solid phase

extraction column to purify;

- Increased the sensitivity of the determination method.

National Food Safety Standard -

Food contact materials and products -

Determination of perfluorooctane sulfonate (PFOS) and

perfluoro caprylic acid (PFOA)

1 Scope

This standard specifies the method for the determination of perfluorooctane

sulfonate (PFOS) and perfluorooctanoic acid (PFOAA) in food contact materials

and products by tandem mass spectrometry.

This standard is applicable to the determination of PFOS and PFOA in food

contact materials and products such as carton, rubber, polyethylene, plastics,

resin, non-stick pan coating and so on.

2 Principle

PFOS and PFOA in food contact materials and products were extracted by

methanol to accelerate solvent extraction, purified by weak anion exchange

solid-phase extraction column, separated by liquid chromatography, ionized by

electrospray ionization, determined by multi-reaction monitoring mode and

quantified by Isotopic internal standard quantity.

3 Reagents and materials

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

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

Note. All organic solvents and materials used in this standard shall be blank tested before using. If the

background value is higher than the quantitative limit, the organic solvent shall be re-steamed. Replace

the test material until the background value is below the limit of quantification.

5 Analytical steps