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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0.06~0.18μg/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。
Objective To establish a simple, rapid and sensitive method for the simultaneous determination of five rare earth elements in tea by inductively coupled plasma mass spectrometry. Methods Two kinds of pretreatment methods, microwave digestion and wet digestion, were compared. Inductively coupled plasma-mass spectrometry (ICP-AES) and inductively coupled plasma-mass spectrometry (ICP- MS) two kinds of determination methods. The microwave digestion procedure and ICP-MS instrument conditions were optimized. The accuracy of the instrument was tested by adding spike test and determination of national standard material GBW10016. Results The detection sensitivity of ICP-MS was high. The detection limit was 0.06 ~ 0.18μg / kg. The recoveries of microwave digestion were 97.65% ~ 103.28% (n = 6) Degree of 91.4% ~ 108.6%. Conclusion For the determination of rare earth elements in tea, the method of microwave digestion and ICP-MS has good selectivity and sensitivity, high recovery, good reproducibility and quantitative accuracy. It is more suitable for the determination of rare earth elements in tea.