电感耦合等离子体发射光谱-质谱法测定鸡蛋中镉的含量

Determination of Cadmium in Egg by ICP-MS

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0.2~5.0ng/mL浓度范围内呈线性相关。在空白样品中添加10~50μg/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3μg/kg,定量限为10μg/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。

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.