Bone porcelain testing

This standard specifies the graphite furnace atomic absorption spectroscopy, inductively coupled plasma mass spectrometry, inductively coupled plasma emission spectroscopy, and flame atomic absorption spectroscopy for the determination of cadmium migration in food contact materials and products after immersion in food simulants. This standard is applicable to the determination of cadmium migration in food contact materials and their products. The principle uses food simulants to soak the parts of food contact materials and products that are expected to come into contact with food. The soaking solution is atomized in a graphite furnace, and the absorption value measured at 228.8 nm is proportional to the cadmium content within a certain concentration range, which is quantitatively compared with the standard series. Unless otherwise specified, all reagents and materials used in this method are high-grade pure, and the water is Grade II water according to GB/T6682. 3.1 Reagent 3.1.1 Nitric acid (HNO). 3.1.2 Ammonium dihydrogen phosphate (NH, HzPO,). 3.1.3 Reagents required for preparing food simulants; According to the provisions of GB 31604.1. 3.2 Reagent preparation 3.2.1 Food simulants: Prepare according to the provisions of GB 5009.156. 3.2.2 Nitric acid solution (1+9); Measure 10 mL of nitric acid, add to 90 mL of water, and mix well. 3.2.3 Nitric acid solution (5+95): Take 50 mL of nitric acid, add to 950 mL of water, and mix well. 3.2.4: Ammonium dihydrogen phosphate solution (20 g/L): Weigh 2.0g of ammonium dihydrogen phosphate, dissolve in water, and bring to a constant volume of 100 mL

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