应用普通ICP-MS和八极杆碰撞/反应池(ORS)技术测定动植物样品中的As和Se的比较

使用普通电感耦合等离子体质谱法(ICP MS)测定一些标准参考物质中多种元素的浓度,该方法不仅可测定常规的有毒元素如As,Pb ,Hg,Cd ,还可以测定常量元素包括P ,Ca,Fe ,K ,Na等。实验研究了消解样品的方法、回收率和方法的检测限等,证明ICP MS的EPA2 0 0 8标准干扰校正方法用于测定食品和植物样品中多元素浓度是可行的。应用ICP MS的八极杆碰撞反应池(ORS)技术测定As ,Se等元素,比较了配置ORS系统与不配置ORS系统的ICP MS仪器对这两种元素测定的结果,讨论了ArCl和ArAr干扰的消除,发现ORS系统可以有效地消除样品基体产生的ArCl,ArAr等分子离子对样品中超痕量的As,Se的干扰。

Determination of As and Se in Animal and Plant Samples by the Normal ICP-MS with and without Octupole Reaction System and the ICP-MS with ORS

Some certified reference materials (CRMs) were digested and the elemental concen trations were determined by ICP-MS instrument, and the results include not on ly the trace key elements such as As, Pb, Hg and Cd but also the major component s such as P, Ca, Fe, K, Na etc. The digestion method, the recoveries, and the de tection limits are discussed to prove the reliability of ICP-MS and EPA200.8 m ethod for the determination of the elements in food and plant samples. The ICP- MS instrument with ORS (octupole reaction system) was applied to the determinati on of As, Se etc, and the results are compared with those from the normal ICP-M S without ORS. The removal of ArCl and ArAr interference is discussed, and the a dvantage of ORS is proved by measuring the As and Se in some CRMs.