Testing of food/food contact materials and products

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 migration in food contact materials and products after immersion in food simulants; The inductively coupled plasma mass spectrometry method for the determination of arsenic, cadmium, chromium, and lead elements in paper products and corks has been established. This standard is applicable to the determination of arsenic, cadmium, chromium, nickel, lead, antimony, and zinc migration in various food contact materials and products, as well as the determination of arsenic, cadmium, chromium, and lead in paper products and corks. Part 1: Determination of Arsenic, Cadmium, Chromium, and Lead 2: Principles: Paper products and cork stoppers are ground and digested with nitric acid. The resulting solution is diluted with water to volume, and then measured by inductively coupled plasma mass spectrometry. Quantitative comparison is made with the standard series. Unless otherwise specified, all reagents and materials used in this method are high-grade pure water. The water is grade I water as specified in GB/T6682. 3.1 Reagent 3.1.1 Nitric acid (HNO3). 3.1.2 Argon (Ar): Purity ≥ 99,99%, or liquid ammonia. 3.1.3 Ammonia gas (He); Purity ≥ 9995%. 3.2 Reagent preparation of nitric acid solution (5+95): Measure 50 mL of nitric acid, slowly add it to 950 mL of water, and mix well. 3.3 Standard substance 3.3.1 Element standard stock solution (10000 mg/L or 100 mg/L): Arsenic, cadmium, chromium, and lead are single element or multi element standard stock solutions that have been certified by the country and have been awarded a standard substance certificate. 3.3.2 Internal standard element reserve solution (1000 mg/L or 100 mg/L): Scandium, cobalt, indium, rhodium, rhenium, bismuth, and other single element or multi-element standard reserve solutions that have been certified by the state and have been awarded standard substance certificates

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