电感耦合等离子体发射光谱-质谱法测定鸡蛋中镉的含量

建立电感耦合等离子体发射光谱-质谱法测定鸡蛋中镉的含量。样品用硝酸经180℃微波消解后,在160℃将酸挥发至近干,用2%硝酸溶液定容后,电感耦合等离子体发射光谱-质谱仪测定。镉在0.2～50 ng/mL浓度范围内呈线性相关。在空白样品中添加10～50 μg/kg浓度范围内,平均回收率在88.5%～957%范围之内,批内变异系数为1.8%～3.4%,批间变异系数为1.8%～6.1%,检测限为3 μg/kg,定量限为10 μg/kg。本方法具有较好的灵敏度、准确度和精密度,能完全满足鸡蛋中镉含量的检测。

Determination of Cadmium in Egg by ICP-MS

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.