关键词: 镉;鸡蛋;电感耦合等离子体发射光谱仪

Abstract:

A ICP-MS method for determination of cadmium in egg was development. The samples were microwave-assisted digested by nitric acid at 180℃, evaporated to dryness at 160℃, and reconstituted by 2% nitric acid, then deterrminated by ICP-MS. The calibration curves of cadmium were linear in the range of 0.2～5.0 ng/mL. The average recoveries ranged between 88.5% and 95.7% from spiked eggs at the three concentration of 10 μg/kg, 20 μg/kg and 50 μg/kg. The between-run relative standard deviation was the range of 1.8%～6.1%, and the inter-run standard deviation was the range of 1.8%～3.4%. The LOD was 3 μg/kg, and the LOQ was 10 μg/kg. This method was found to be suitable for trace analysis of cadmium in eggs.

Key words: cadmium, egg, inductively coupled plasma atomic emission spectrometry