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GB 31604.49-2016 English PDF (GB31604.49-2016)

GB 31604.49-2016 English PDF (GB31604.49-2016)

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GB 31604.49-2016: National food safety standard -- Food contact materials and articles -- Migration of arsenic, cadmium, chromium, nickel, lead, antimony and zinc

This standard specifies the inductively coupled plasma mass spectrometry and inductively coupled plasma emission spectrometry for the determination of arsenic, cadmium, chromium, nickel, lead, antimony and zinc in the food contact materials and articles after being immersed in food simulants, AND specifies the inductively coupled plasma mass spectrometry for the determination of arsenic, cadmium, chromium and lead in paper products and cork stoppers.
GB 31604.49-2016
GB
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
National food safety standard ?€?
Food contact materials and articles ?€?
Determination of arsenic, cadmium, chromium
and lead; migration of arsenic, cadmium,
chromium, nickel, lead, antimony and zinc
ISSUED ON. OCTOBER 19, 2016
IMPLEMENTED ON. APRIL 19, 2017
Issued by National Health and Family Planning Commission of the PRC
Table of contents
Foreword ... 3
1 Scope ... 4
Part I. Determination of arsenic, cadmium, chromium and lead Inductively coupled plasma mass spectrometry ... 4
2 Principle... 4
3 Reagents and materials ... 4
4 Instruments and equipment ... 6
5 Analytical procedures ... 6
6 Expression of analytical results ... 8
7 Precision... 9
8 Others ... 9
Part II. Determination of migration quantity of arsenic, cadmium, chromium, nickel, lead, antimony, and zinc ... 9
Method I. Inductively coupled plasma mass spectrometry ... 9
9 Principle... 9
10 Reagents and materials... 9
11 Instruments and equipment ... 11
12 Analytical procedures ... 11
13 Expression of analytical results ... 12
14 Precision ... 13
15 Others ... 13
Method II. Inductively coupled plasma - atomic emission spectrometry ... 13 16 Principle... 13
17 Reagents and materials... 13
18 Instruments and equipment ... 14
19 Analytical procedures ... 15
20 Expression of analytical results ... 15
21 Precision ... 15
22 Others ... 15
Appendix A Instrument reference working conditions and the recommended
mass-to-charge ratio or analysis wavelength of each element ... 17
Foreword
This standard replaces the determination of migration quantity of arsenic, cadmium, chromium, nickel, lead, antimony and zinc as well as the content of arsenic, cadmium, chromium, and lead in paper products and cork stoppers as specified in SN/T 2829-2011 ?€?Food contact materials for export - Metal
materials - Determination of migrant heavy metals in food simulant -
Inductively coupled plasma atomic emission spectrometric method?€?, SN/T
2597-2010 ?€?Determination of lead, cadmium, chromium, arsenic, antimony, germanium migration quantity in polymer for food contact materials -
Inductively coupled plasma atomic emission spectrometry method?€?, and SN/T 2594-2010 ?€?Food contact materials - Determination of lead, cadmium,
chromium, and arsenic in cork stoppers by inductively coupled plasma mass spectrometry?€?.
As compared with SN/T 2829-2011, SN/T 2597-2010 and SN/T 2594-2010, the main changes of this standard are as follows.
- CHANGE the standard name into ?€?National food safety standard - Food
contact materials and articles - Determination of arsenic, cadmium,
chromium and lead; migration of arsenic, cadmium, chromium, nickel, lead, antimony and zinc?€?.
National food safety standard ?€?
Food contact materials and articles ?€?
Determination of arsenic, cadmium, chromium
and lead; migration of arsenic, cadmium,
chromium, nickel, lead, antimony and zinc
1 Scope
This standard specifies the inductively coupled plasma mass spectrometry and inductively coupled plasma emission spectrometry for the determination of arsenic, cadmium, chromium, nickel, lead, antimony and zinc in the food contact materials and articles after being immersed in food simulants, AND specifies the inductively coupled plasma mass spectrometry for the
determination of arsenic, cadmium, chromium and lead in paper products and cork stoppers.
This standard applies to the determination of the migration quantity of arsenic, cadmium, chromium, nickel, lead, antimony and zinc in various food contact materials and articles, as well as the determination of arsenic, cadmium, chromium and lead in paper products and cork stoppers.
Part I. Determination of arsenic, cadmium,
chromium and lead Inductively coupled
plasma mass spectrometry
2 Principle
Paper products and cork stoppers are crushed AND digested by nitric acid; AND the solution obtained is diluted by water to make its volume reach to the mark, determined by the inductively coupled plasma mass spectrometry, AND compared with the standard series for quantitative purposes.
3 Reagents and materials
Unless otherwise stated, the reagents used in this method are of guarantee reagent AND the water is level I water as specified in GB/T 6682.
3.1 Reagents
3.1.1 Nitric acid (HNO3).
WEIGH 0.5 g of the crushed sample (accurate to 0.1 mg); PLACE it in the polytetrafluoroethylene digestion inner tank; ADD 5 mL ~ 8 mL of nitric acid; COVER it and LET it stand for 1 h; SEAL the digestion tank and PLACE it in the microwave digestion system; CONDUCT digestion in accordance with the standard operation procedures of the microwave digestion instrument; AND it may make reference to the digestion conditions in A.6 for digestion purposes. After finishing the digestion, TAKE the digestion tank out of the digestion instrument; when the digestion tank is completely cooled down, slowly OPEN the inner cover; USE a small amount of water to rinse the inner cover for two times; COMBINE the rinsing water into the digestion tank. PLACE the
digestion tank onto the temperature control heating plate at 140 ??C to heat it for 30 min, or otherwise PLACE it into the ultrasonic water bath ultrasonic for degassing for 5 min; TRANSFER all the digestion solution into a 50 mL
volumetric flask; USE water to make the volume reach to the mark; MIX it uniformly; PREPARE for determination. And meanwhile MAKE the sample
blank.
5.2.2 Pressure sealed digestion
WEIGH 0.5 g of the pulverized sample (accurate to 0.1 mg); PLACE it in
polytetrafluoroethylene digestion inner tank; ADD 5 mL ~ 8 mL of nitric acid; COVER and LET it stand for 1 h; SEAL the digestion inner tank into the
stainless steel outer tank; PLACE it into the constant temperature oven for digestion; AND it may make reference to the digestion conditions of A.6 for digestion. After finishing the digestion, when the digestion tank is completely cooled down, slowly OPEN the inner cover; USE a small amount of water to rinse the inner cover for two times; COMBINE the rinsing water into the digestion tank. PLACE the digestion tank onto the temperature control heating plate at 140 ??C to heat it for 30 min, or otherwise PLACE it into the ultrasonic water bath ultrasonic for degassing for 5 min; TRANSFER all the digestion solution into a 50 mL volumetric flask; USE water to make the volume reach to the mark; MIX it uniformly; PREPARE for determination. And meanwhile MAKE the sample blank.
5.3 Instrument reference conditions
5.3.1 USE the instrument tuning use solution to optimize the working
conditions of the instrument, with the instrument reference conditions as shown in A.1 AND the element reference analysis mode as shown in A.2.
Note. For instruments that do not have the appropriate interference elimination mode, it is required to use the interference correction equation to correct the determination results of arsenic, cadmium and lead. AND the interference correction equation is as shown in A.3.
5.3.2 In the selected instrument working conditions, EDIT the determination; SELECT the mass-to-charge ratio of the element to be determined and the internal standard substance, with the reference conditions as shown in A.1 and A.2.
10.1.1 Argon (Ar). purity ??? 99.99%, or liquid argon.
10.1.2 Nitric acid (HNO3).
10.1.3 Helium (He). purity ??? 99.995%.
10.1.4 Reagents required for preparing food simulant. in accordance with the provisions of GB 31604.1.
10.2 Reagent preparation
10.2.1 Food simulant. PREPARE it in accordance with the provisions of GB 5009.156.
10.2.2 Nitric acid solution (5 + 95). MEASURE 50 mL of nitric aci...

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