微波消解-电感耦合等离子体质谱法同时测定茶叶中17种无机元素

Simultaneous Determination of 17 Trace Elements in Tea with ICP-MS and Microwave Digestion

采用微波消解-电感耦合等离子体质谱（ICP-MS）法测定了茶叶中Be、V、Cr、Mn、Fe、Co、Ni、Cu、Zn、As、Se、Mo、Cd、Ba、Pb、Th、U等17种无机元素。以硝酸-过氧化氢法消化,以^6Li、^45Sc、^72Ge、^115In、^209Bi为内标,以ICP-MS定量分析。结果表明,该法对17种元素的线性关系良好,线性相关系数大于0.995 0,待测元素的检出限为0.009-0.136 ng/m L,相对标准偏差≤10%。该法准确、灵敏、简单、快速、安全,能满足茶叶样品中多种元素的检测需求,可用于茶叶的质量控制和安全评价。

Microwave digestion and inductively coupled plasma-mass spectrometry（ICP-MS） was used to simultaneously determine 17 elements including Be,V,Cr,Mn,Fe,Co,Ni,Cu,Zn,As,Se,Mo,Cd,Ba,Pb,Th and U in tea. Samples were decomposed by HNO3 and H2O2, and directly analyzed by ICP-MS. ^6Li,^45Sc,^72Ge,^115In and ^209Bi were used as the internal standard elements to compensate matrix effect. A good linear range in 0.009-0.136 ng/mL （R2=0.995 0） was obtained. The relative standard deviation was below 10%. It is accurate, sensitive, simple, rapid, safe and suitable for controlling quality and evaluating safety of tea.