电感耦合等离子体-质谱法直接测定果汁中砷、铅

采用微量进样、在线添加内标115In、使用动态反应池的方法,建立电感耦合等离子体质谱(inductivelycoupled plasma-mass spectrometry,ICP-MS)法直接测定果汁中砷、铅的方法。结果表明:方法检出限砷和铅均小于2.000μg/L,不同加标量下的As和Pb回收率分别在95.69%～105.45%和100.98%～105.14%之间,结果分析表明,测定值(0.0875μg/g)与参考值(0.085μg/g)吻合,As、Pb相对标准偏差分别为2.50%、2.94%。将比对样品经微波消解后测定结果与该直接测定方法测定结果比较无显著差异,表明该方法简便、快速、准确,完全能够满足果汁中砷、铅的检测要求。

Direct Determination of Arsenic and Lead in Fruit Juice by Inductively Coupled Plasma Mass Spectrometry

Inductively coupled plasma mass spectrometry(ICP-MS) with dynamic reaction cell(DRC) was applied for the direct determination of arsenic(As) and lead(Pb) in fruit juice via microinjection and online addition of 115In as internal standard.The limits of detection for As and Pb were both less than 2.000μg/L.The results showed that the spiked recovery rates were in the range of 95.69%-105.45% for As and 100.98%-105.14% for Pb.This method was validated by juice reference material.The analytical value(0.0875 μg/g) was consistent with the recommended value(0.085 μg/g) with RSDs of 2.50% and 2.94% for As and Pb,respectively.The results obtained using microwave digestion followed by ICP-MS and the method showed no significant difference.The method was simple,rapid,accurate and completely met the requirements for the determination of arsenic and lead in fruit juice.