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GB 31604.35-2016

Chinese Standard: 'GB 31604.35-2016'
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GB 31604.35-2016English70 Add to Cart 0--10 minutes. Auto immediate delivery. Determination of perfluorooctane sulfonates (PFOS) in the food packaging materials--High performance liquid chromatography-tandem mass spectrometry Valid GB 31604.35-2016
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Detail Information of GB 31604.35-2016; GB31604.35-2016
Description (Translated English): Determination of perfluorooctane sulfonates (PFOS) in the food packaging materials--High performance liquid chromatography-tandem mass spectrometry
Sector / Industry: National Standard
Classification of Chinese Standard: X09
Word Count Estimation: 8,897
Date of Issue: 2016-10-19
Date of Implementation: 2017-04-19
Older Standard (superseded by this standard): GB/T 23243-2009
Regulation (derived from): State Health and Family Planning Commission Notice No.1516 of 2016

GB 31604.35-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National Food Safety Standard -
Food contact materials and products -
Determination of perfluorooctane sulfonate (PFOS) and
perfluoro caprylic acid (PFOA)
食品安全国家标准 食品接触材料及制品 全氟辛烷磺酸
(PFOS)和全氟辛酸(PFOA)的测定
ISSUED ON. OCTOBER 19, 2016
IMPLEMENTED ON. APRIL 19, 2017
Issued by. National Health and Family Planning Commission of People's
Republic of China
Table of Contents
Foreword . 3 
1 Scope .. 4 
2 Principle.. 4 
3 Reagents and materials .. 4 
4 Instruments and equipment . 6 
5 Analytical steps . 7 
6 Expression of the analytic result .. 9 
7 Precision. 10 
8 Others .. 10 
Appendix A Chromatogram . 11 
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.
3.1 Reagents
3.1.1 Methanol (CH3OH). Chromatographic purity.
3.1.2 Acetonitrile (CH3CN). Chromatographic purity.
5 Analytical steps
5.1 Sample preparation
For plastics, silica gel sample. cut to size below 5mm×5mm; then grind into
powder by liquid nitrogen frozen grinder. For resin. smash then grind into
powder with liquid nitrogen frozen grinder. For coated sample. scrape with knife,
then grind into powder by liquid nitrogen frozen grinder. For cardboard box and
polyethylene sample. use scissors to cut to 1cm×1cm.
5.2 Extraction and purification
5.2.1 Extraction
Weigh 1g (accurate to 0.01g) of sample and put it into an accelerated solvent
extraction pool. The extraction solvent is methanol. The volume of extraction
solvent is 60% the volume of the sample pool. The extraction temperature shall
be 110°C. The heating time shall be 5 min. Balance for 5 min. Repeat twice.
Place the extraction solution at room temperature. Dry with nitrogen-blowing to
about 0.5 mL. Add 10mL of water and mix for purification.
5.2.2 Purification
Activate and balance the WAX solid phase extraction column with 4 mL of
methanol animation, 4 mL of methanol and 4 mL of water in turn. Then transfer
the above solution to the solid phase extraction column. Add 4mL of 25mmol/L
ammonium acetate buffer solution to rinse-wash. Add 4 mL of 0.1% ammonia
methanol to elute. Collect the eluent and dry by nitrogen at 40°C. Re-dissolve
by 1 mL of m......
Related standard:   GB 31604.26-2016  GB 31604.27-2016
   
 
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