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GB 31604.34-2016 English PDF (GB31604.34-2016)

GB 31604.34-2016 English PDF (GB31604.34-2016)

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GB 31604.34-2016: Method for analysis of hygienic standard of papers for food packaging

This Standard specifies the graphite furnace atomic absorption spectrometric method, inductively coupled plasma mass spectrometric method, inductively coupled plasma atomic emission spectrometric method and flame atomic absorption spectrometric method for the determination of lead in paper products and cork stoppers and lead migration after being soaked in the food simulants.
GB 31604.34-2016
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
National Food Safety Standard - Food Contact Materials
and Products - Determination of Lead and Its Migration
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ISSUED ON. OCTOBER 19, 2016
IMPLEMENTED ON. APRIL 19, 2017
Issued by. National Health and Family Planning Commission of the
PEOPLE Republic of China
Table of Contents
Foreword ... 4
1 Application Scope ... 5
Part I ?€? Determination of Lead ... 5
2 Principle ... 5
3 Reagents and Materials ... 5
4 Apparatus ... 6
5 Analytical Procedure ... 7
6 Expression of Analytical Results ... 7
7 Accuracy ... 8
8 Others ... 8
Part II ?€? Determination of Lead Migration ... 8
9 Principle ... 8
10 Reagents and Materials ... 9
11 Apparatus ... 10
12 Analytical Procedure ... 10
13 Expression of Analytical Results ... 11
14 Accuracy ... 11
15 Others ... 11
16 Principle ... 11
17 Reagents and Materials ... 12
18 Apparatus ... 13
19 Analytical Procedure ... 13
20 Expression of Analytical Results ... 13
21 Accuracy ... 14
22 Others ... 14
Annex A Reference Temperature Rise Procedure for Graphite Furnace Atomic Absorption Spectrometer ... 15
Annex B Reference Operating Conditions for Flame Atomic Absorption
Spectrometer ... 16
Foreword
This Standard replaces the determination of lead of its migration of GB/T 5009.62- 2003, Method for analysis of hygienic standard of ceramics for food containers, GB/T 5009.63-2003, Method for analysis of hygienic standard of enamel for food containers, GB/T 5009.72, Method for analysis of hygienic standard of aluminum-wares for food use, GB/T 5009.78-2003, Method for analysis of hygienic standard of papers for food packaging, GB/T 5009.81-2003, Method for analysis of hygienic standard of stainless steel food containers and table wares, GB/T 3534-2002, Standard testing methods for lead and cadmium release from domestic ceramics, GB 8058-2003, Standard permissible limits and testing method for release of lead or cadmium from ceramic cookware, GB/T 21170-2007, Glass hollowware ?€? Test method for lead and cadmium release, 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, 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 2886, Food contact materials for export ?€? Determination of lead and cadmium release in glass container simulants, and SN/T 2594-2010, Food contact materials ?€? Determination of lead, cadmium, chromium, and arsenic in cork stoppers by inductively coupled plasma mass spectrometry.
Compared with GB/T 5009.62-2003, the main changes of this Standard are as follows. -- it changes the name of the standard into ?€?National Food Safety Standard ?€? Food Contact Materials and Products ?€? Determination of Lead and Its Migration?€?; -- it adds the determination of lead;
-- it adds the graphite furnace atomic absorption spectrometric method; -- it adds the inductively coupled plasma mass spectrometric method;
-- it adds the inductively coupled plasma atomic emission spectrometric method; and
-- it deletes the dithizone colorimetric method.
National Food Safety Standard ?€? Food Contact Materials
and Products ?€? Determination of Lead and Its Migration
1 Application Scope
This Standard specifies the graphite furnace atomic absorption spectrometric method, inductively coupled plasma mass spectrometric method, inductively coupled plasma atomic emission spectrometric method and flame atomic absorption spectrometric method for the determination of lead in paper products and cork stoppers and lead migration after being soaked in the food simulants.
This Standard applies to the determination of lead in paper products and cork stoppers and lead migration in food contact materials and products.
Part I ?€? Determination of Lead
Method I ?€? Graphite Furnace Atomic Absorption Spectrometric Method
2 Principle
Grind the paper products or cork stoppers; use the dry method for digestion; atomize the digestion solution in a graphite furnace; determine absorbency by comparing with the standard series (the absorption value measured at 283.3 nm within a certain concentration range is in direct proportion to the lead content).
3 Reagents and Materials
Unless specified otherwise, all reagents used for this method are guaranteed reagents and the water is water grade II specified in GB/T 6682.
3.1 Reagents
3.1.1 Nitric acid (HNO3).
3.1.2 Ammonium dihydrogen phosphate (NH4H2PO4).
3.1.3 Palladium nitrate [Pd(NO3)2].
3.2 Preparation of reagents
3.2.1 Nitric acid solution (5 + 95). measure 50 mL of nitric acid; add to 950 L of water; and mix up.
4.4 Analytical balance. sensitivities 0.1 mg and 1 mg.
5 Analytical Procedure
5.1 Digestion of sample
Take an appropriate amount of sample, grind and mix up. Weigh 1 g to 5 g (accurate to 0.001 g) of sample to place into a crucible; first use soft fire to carbonize to smokeless on an adjustable electric hot plate; transfer to muffle furnace at 500??C for ashing for 6 h to 8 h and then cool down. If any test piece is not ashed completely, add 1 mL of nitric acid to heat on the adjustable electric hot plate with soft fire; repeat it for multiple times until it is digested completely; place it aside for cooling; use nitric acid (1 + 1) to dissolve the ash; transfer to a 25 mL volumetric flask; use a small amount of water to wash the crucible for multiple times; combine the washings into the volumetric flask and dilute to scale; and mix up for standby. Meanwhile, use it as the reagent blank. 5.2 Determination
5.2.1 Apparatus testing conditions
See Table A.1 for the reference conditions.
5.2.2 Establishment of standard curve
In accordance with the sequence of concentrations from low to high, put 10 ??L of lead standard serial solution and 5 ??L of palladium nitrate solution-ammonium dihydrogen phosphate solution (the sample size can be decided in accordance with the apparatus used) respectively into the graphite furnace at the same time; measure their absorption values after atomization; and establish the standard curve with the concentrations as the horizontal coordinates and the absorption values as the vertical coordinates. 5.2.3 Determination of sample
Place 10 ??L of blank solution or sample solution and 5 ??L of palladium nitrate solution- ammonium dihydrogen phosphate solution (the sample size can be decided in accordance with the apparatus used) into a graphite furnace at the same time; measure its absorption value after atomization; and determine the absorbance by comparing with the standard series.
6 Expression of Analytical Results
The lead content in the sample is calculated in accordance with the following equation. absorbance by comparing with the standard series (the absorption value measured at 283.3 nm within a certain concentration range is in direct proportion to the lead content). 10 Reagents and Materials
Unless specified otherwise, all reagents used for this method are guaranteed reagents and the water is water grade II specified in GB/T 6682.
10.1 Reagents
10.1.1 Nitric acid (HNO3).
10.1.2 Ammonium dihydrogen phosphate (NH4H2PO4).
10.1.3 Reagents required for the preparation of food simulant. as specified in GB 30604.1.
10.2 Preparation of reagents
10.2.1 Food simulant. prepared as specified in...

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