ICP-MS同时测定谷类食物中18种微量元素的研究

Application of ICP-MS on simultaneous determination of 18 trace elements in grain

目的:建立谷类食物中18种微量元素(89Y、139La、140Ce、141Pr、142Nd、152Sm、153Eu、158Gd、159Tb、163Dy、165Ho、166Er、169Tm、174Yb、175Lu、75As、208Pb、111Cd)电感耦合等离子体质谱(ICP-MS)的分析方法。方法:通过优化消解方法,使基质消解更完全,用ICP-MS进行分析,用混合内标校正基体干扰和漂移。结果:该法所有元素的检出限均小于30ng/kg,回收率介于92.35%～109.31%。结论:该法具有操作简便、快速、灵敏度高、准确性好和多种元素同时测定等优点。

Objective：To develop a method for determination of 18 trace elements（89Y,139La,140Ce,141Pr,142Nd,152Sm,153Eu,158Gd,159Tb,163Dy,165Ho,166Er,169Tm,174Yb,175Lu,75As,208Pb,111Cd）in grain by ICP-MS.Methods：Optimized the condition of digestion,made the digestion complete,the samples were determined by ICP-MS which used mixed internal standard to correct matrix interference and signal drifting.Results：The range of detection limit of observed 18 trace elements were all below 30ng/kg,and recoveries 92.35% ~ 109.31%.Conclusion：This method was simple,rapid,accurate,and could be used to determine 18 trace elements in grain.