湿法快速消解-电感耦合等离子质谱法测定大米中的锌、铜、镍

目的探讨电感耦合等离子体质谱法测定大米中铜、锌、镍时,消解温度、混合酸体系和消解时间等因素对测定数据的影响,寻找最佳的样品处理方法。方法通过以45Sc、115In、209Bi作为内标元素进行仪器干扰的校正,对质控样分别采用快速消解和微波消解进行处理,将测定值进行对比。结果锌、铜、镍的检出限分别是0.0012、0.0037、0.0007 ng/mL;回收率在91.20%～106.82%;精密度为5.78%～6.42%。结论采用这2种消解方法对于质控样的测定值基本一致,且都在质控样的标值范围内,表明快速消解和微波消解均可用于大米中铜、锌、镍的测定。

Determination of zinc, copper and nickel in rice by wet fast digestion-inductively coupled plasma mass spectrometry

Objective To determine the effect of digestion temperature, mixed acid system and digestion time and other factors on the measured data in the determination of copper, zinc and nickel in rice by inductively coupled plasma mass spectrometry, and find the best sample processing method. Methods The instrument interference was corrected by using 45Sc, 115In and 209Bi as internal standard elements. The quality control samples were processed by fast digestion and microwave digestion, and the measured values were compared. Results The detection limits of zinc, copper and nickel were 0.0012, 0.0037 and 0.0007 ng/mL, respectively; the recovery was 91.20%?106.82% and the precision was 5.78%?6.42%. Conclusion The two digestion methods are basically consistent for the quality control samples, and they are all within the calibration range of the quality control samples, indicating that both rapid digestion and microwave digestion can be used for the determination of copper, zinc and nickel in rice.