Objective: A method for the determination of organic selenium in yeast selenium by microwave digestion and hydride generation atomic fluorescence spectrometry has been developed.Methods: The effects of the instrumental and chemical parmenters on atomic fluorescence signal of selenium were investigated by microwave digestion sample.The effects of other factors were briefly discussed.The detection limit for selenium is 0.10μg/L under the optimum condition.The relative standard derivation is less than 0.42%.The linear range is 0~80 μg/L.The recoveries of selenium were 98.8%~102.2% in sample.Conclusion: The method has the advantages of high sensitivity,low detection limit,the interference of foreign ions is small,wide linear range,simple and quick method etc.

采用电感耦合等离子体串联质谱法测定茶叶样品中1 6种稀土元素,通过加标回收实验,建立了茶叶样品中稀土元素含量的ICP-MS分析方法.测定1 6种稀土元素的相对标准偏差均小于10%,加标回收率为93%～1 06%.结果表明,本方法不但操作简便快速,而且具有灵敏度高、检出限低、重现性好等优点.

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