面粉样品经微波消解后,以~(45)Sc为内标元素校准基体效应及信号漂移,用电感耦合等离子体.质谱法直接测定,外标法绘制校准曲线进行定量。测定面粉中铝的检出限为0.25mg/kg,线性良好,相关系数r=0.9999,相对标准偏差1.25%—3.03%,加标回收率在93.9%—103.5%之间。该方法灵敏快速,干扰小,重现性好,能满足面粉中铝含量测定的要求。 After the microwave digestion, the matrix effect and signal drift were calibrated with ~ (45) Sc as the internal standard element, and then directly determined by inductively coupled plasma mass spectrometry and the calibration curve by external standard method. The detection limit of aluminum in flour was 0.25mg / kg, the linearity was good, the correlation coefficient was 0.9999, the relative standard deviation was 1.25% -3.03%, and the recoveries were in the range of 93.9% -103.5%. The method is sensitive and rapid, small interference, reproducibility, and can meet the requirements of aluminum content determination in flour.