微波消解－ICP-MS法测定葵花籽壳、仁中Mg、Al含量

Determination of Mg and Al Contents in Sunflower Seed Shells and Nuts by Microwave Digestion-ICP-MS

摘要:

建立微波消解－ICP-MS法同时测定葵花籽壳、仁中Mg、Al的含量。方法：采用微波消解系统进行前处理，以45Sc作为Mg、Al的内标元素控制分析信号的动态漂移，用ICP-MS法同时测定葵花籽壳、仁中Mg、Al的含量。Mg、Al的回收率在95％～105％之间；Mg、Al的检出限分别为0.01 mg/kg、0.001 mg/kg；线性相关系数均为1.000 0；RSD/%≤2%。准确度良好，测得值在其标准值范围内。该法检出限、精密度、准确度试验的结果均满足要求，可用于测定葵花籽壳、仁中Mg、Al的含量，为完善葵花籽产品的质量标准提供依据。

Abstract:

This study was to establish a microwave digestion-ICP-MS method for the simultaneous determination of Mg and Al contents in sunflower seeds (shells and nuts). With a microwave pre-digestion, 45Sc as internal standard to control the dynamic drift of the signal and an ICP-MS analytical method, Mg and Al recoveries were between 95%~105%, detection limits were separately 0.01 mg/kg and 0.001 mg/kg, and linear correlation coefficient was 1.000 0 (RSD≤2%). The values obtained through the same method for the National Standard Rice [GBW10010 (GSB-1)] were also within the standard range. Therefore, the detection limit, precision and accuracy of the method meet the requirements for determination of Mg and Al contents in sunflower seed shells and nuts, and this method supports to improve quality control standards for sunflower.