茶叶中五种稀土元素的测定

Determination of 5 sorts of rare earth elements in tea

中文关键词:  茶叶  稀土  微波消解  电感耦合等离子质谱

英文关键词:tea  rare earth elements  microwave digestion  inductively coupled plasma-mass spectrometry

中文摘要:

      目的 建立一种简单、快速、灵敏的同时测定茶叶中5 种稀土元素的电感耦合等离子体质谱方法。方法 比较了微波消解和湿法消解两种前处理方法, 比较了电感耦合等离子发射光谱(inductively coupled plasma-atomic emission spectrometry, ICP-AES)和电感耦合等离子质谱(inductively coupled plasma-mass spectrometry, ICP-MS)两种测定方法。优化了微波消解程序和ICP-MS的仪器条件, 通过加标试验和国家标准物质茶叶GBW10016的测定分析其准确性。结果 ICP-MS检测灵敏度高, 仪器检出限为0.06~0.18 μg/kg, 微波消解的加标回收率较高, 为97.65%~103.28%(n=6), 其测定国家标准物质茶叶的准确度为91.4%~108.6%。结论 对于茶叶中稀土元素的检测, 采用微波消解、ICP-MS测定的方法, 选择性和灵敏度好、回收率高、重现性好、定量准确, 更适用于茶叶中稀土元素的测定。

英文摘要:

      Objective To establish a rapid and sensitive method which can determine 5 sorts of rare earth elements in tea by inductively coupled plasma-mass spectrometry (ICP-MS) method. Methods The samples were determined by inductively coupled plasma-atomic emission spectrometry (ICP-AES) and ICP-MS with microwave digestion and wet digestion. Microwave digestion procedure and ICP-MS instrument condition were optimized. Results The recoveries of rare earth elements determined by ICP-MS with microwave digestion were 97.65%~103.28% (n=6), while the detection limits were 0.06~0.18 μg/kg. Conclusion Determination of rare earth elements in tea by ICP-MS with microwave digestion had many advantages, such as high sensitivity and high selectivity, accurate quantification, high precision and accuracy, high reproducibility and high recovery rate, which was suitable for the detection of rare earth elements in tea.