1 Scope
This standard specifies the graphite furnace atomic absorption spectrometry, inductively coupled plasma mass spectrometry, inductively coupled plasma emission spectrometry and flame atomic absorption spectrometry for the determination of cadmium migration in food contact materials and articles after being soaked in food simulants.
This standard is applicable to the determination of cadmium migration in food contact materials and articles.
Method I Graphite Furnace Atomic Absorption Spectrometry
2 Principle
Soak the parts of the food contact materials and articles which are expected to contact with food in food simulants, atomize the soak solution in the graphite furnace; within certain concentration range, the absorption value determined at 228.8nm is in direct proportion to the cadmium content and is compared with standard series for quantification.
3 Reagents and Materials
Unless otherwise specified, guaranteed reagents and Class-II water (defined in GB/T 6682) are adopted for the purpose of this method.
3.1 Reagents
3.1.1 Nitric acid (HNO3).
3.1.2 Ammonium dihydrogen phosphate (NH4H2PO4).
3.1.3 Reagents required for preparation of food simulants: in accordance with the requirements of GB 31604.1.
3.2 Preparation of reagents
3.2.1 Food simulants: prepared according to the requirements of GB 5009.156.
3.2.2 Nitric acid solution (1+9): measure 10mL nitric acid, add into 90mL water and mix uniformly.
3.2.3 Nitric acid solution (5+95): pipet 50mL nitric acid, add into 950mL water and mix uniformly.
3.2.4 Ammonium dihydrogen phosphate solution (20g/L): weigh 2.0g ammonium dihydrogen phosphate, dissolve in water and scale the volume to 100mL.
3.3 Standard product
Foreword i
1 Scope
2 Principle
3 Reagents and Materials
4 Instruments and Apparatus
5 Analysis Steps
6 Expression of Analysis Results
7 Accuracy
8 Other
9 Principle
10 Reagents and Materials
11 Instruments and Apparatus
12 Analysis Steps
13 Expression of Analysis Results
14 Accuracy
15 Other
Annex A Reference Temperature Rise Procedures of Graphite Furnace Atomic Absorption Spectrometer
Annex B Operating Reference Conditions of Flame Atomic Absorption Spectrometer
1 Scope
This standard specifies the graphite furnace atomic absorption spectrometry, inductively coupled plasma mass spectrometry, inductively coupled plasma emission spectrometry and flame atomic absorption spectrometry for the determination of cadmium migration in food contact materials and articles after being soaked in food simulants.
This standard is applicable to the determination of cadmium migration in food contact materials and articles.
Method I Graphite Furnace Atomic Absorption Spectrometry
2 Principle
Soak the parts of the food contact materials and articles which are expected to contact with food in food simulants, atomize the soak solution in the graphite furnace; within certain concentration range, the absorption value determined at 228.8nm is in direct proportion to the cadmium content and is compared with standard series for quantification.
3 Reagents and Materials
Unless otherwise specified, guaranteed reagents and Class-II water (defined in GB/T 6682) are adopted for the purpose of this method.
3.1 Reagents
3.1.1 Nitric acid (HNO3).
3.1.2 Ammonium dihydrogen phosphate (NH4H2PO4).
3.1.3 Reagents required for preparation of food simulants: in accordance with the requirements of GB 31604.1.
3.2 Preparation of reagents
3.2.1 Food simulants: prepared according to the requirements of GB 5009.156.
3.2.2 Nitric acid solution (1+9): measure 10mL nitric acid, add into 90mL water and mix uniformly.
3.2.3 Nitric acid solution (5+95): pipet 50mL nitric acid, add into 950mL water and mix uniformly.
3.2.4 Ammonium dihydrogen phosphate solution (20g/L): weigh 2.0g ammonium dihydrogen phosphate, dissolve in water and scale the volume to 100mL.
3.3 Standard product
Contents of GB 31604.24-2016
Foreword i
1 Scope
2 Principle
3 Reagents and Materials
4 Instruments and Apparatus
5 Analysis Steps
6 Expression of Analysis Results
7 Accuracy
8 Other
9 Principle
10 Reagents and Materials
11 Instruments and Apparatus
12 Analysis Steps
13 Expression of Analysis Results
14 Accuracy
15 Other
Annex A Reference Temperature Rise Procedures of Graphite Furnace Atomic Absorption Spectrometer
Annex B Operating Reference Conditions of Flame Atomic Absorption Spectrometer