电感耦合等离子体质谱法测定食盐中痕量铅

Determination of trace lead in salt by using inductively coupled plasma mass spectrometry

目的：建立电感耦合等离子体质谱（ICP-MS）测定食盐中痕量铅的方法。方法：以209Bi为内标元素校准基体效应及信号漂移,调节仪器测定参数,外标法绘制工作曲线。结果：该方法对食盐中铅的检出限为0.5μg/L,相对标准偏差1.7%－3.6%,回收率在95%－109%之间。结论：该方法具有灵敏度高,操作简便快速,检出限低,精密度好的特点,应用于实际样品的测定,结果满意。

Objective：To establish an ICP-MS method to determine the trace lead in salt.Methods：209Bi was used as internal standards for eliminating matrix effect and signal drift and the instrument′s parameters were adjusted to good state.External calibration was applied for making calibration curve.Results：The limit of detection for lead in salt was 0.5 μg/L,the relative standard deviation was 1.7%~3.6% and recovery rate was 95%～109%.Conclusion：It was showed that this method was sensitive,rapid with good accuracy,precision and low detection limit.It was a high efficient and feasible method which can be used for detection of lead in salt.