This standard specifies graphite furnace atomic absorption spectrometry, inductively coupled plasma mass spectrometry, inductively coupled plasma emission spectrometry and flame atomic absorption spectrometry for the determination of lead migration in food contact materials and articles after soaking in food simulants after being soaked in food simulants and determination of lead in paper products and corks.
This standard is applicable to the determination of lead migration in food contact materials and articles and lead in paper products and corks.
Part I Determination of Lead
Method I Graphite Furnace Atomic Absorption Spectrometry
2 Principle
Digest the paper product and cork with dry method after grinding, atomize the digestion solution through graphite furnace. Within certain concentration range, absorption value is in direct proportion to lead content at 283.3nm, 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 Palladium nitrate [Pd(NO3)2].
3.2 Preparation of reagents
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 16 Principle 17 Reagents and Materials 18 Instruments and Apparatus 19 Analysis Steps 20 Expression of Analysis Results 21 Accuracy 22 other Annex A Reference Temperature Rise Procedures of Graphite Furnace Atomic absorption Spectrometer Annex B Operating Reference Conditions of Flame Atomic Absorption Spectrometer
