ICP-MS法测定西洋参中微量元素

ICP-MS Determination of Trace Elements in American Ginseng

建立电感耦合等离子体质谱(ICP-MS)法测定西洋参中B、Ti、V、Cr、Mn、Fe、Co、Ni、Cu、Zn、As、Mo、Cd、Sn、Sb、Ba、Hg、Pb共18种微量元素的分析方法。采用微波消解法消解样品后直接进行分析,应用碰撞/反应池(ORS)技术有效地消除了多原子离子对待测元素的干扰,选用Sc、Y、In、Bi等元素为内标混合液校正基体干扰和漂移。方法的检出限为0.002～0.323μg/L,采用国家一级标准物质人参(GB W 10027)进行方法验证,结果准确可信。本法简便、快速,能满足西洋参中多种微量元素同时测定的分析需求。

An inductively coupled plasma mass spectrometry（ICP-MS） method based on octopole reaction system（ORS） was developed for the determination of B,Ti,V,Cr,Mn,Fe,Co,Ni,Cu,Zn,As,Mo,Cd,Sn,Sb,Ba,Hg and Pb in American ginseng.Samples were digested with HNO3 and H2O2 followed by dilution with ultrapure water and were then analyzed directly by ICP-MS.The interferences from polyatomic ions were eliminated by using ORS.An internal standard mixuture of Sc,Y,In and Bi was used to correct the matrix interference and drift.The limits of detection for the 18 elements varied from 0.002 to 0.323 μg/L,and accurate and reliable results were obtained for validation of the ICP-MS method with ginseng reference material according to the national standard GB W 10027.This method was rapid,simple and feasible for the analysis of trace elements in American ginseng.