三重四极杆ICP-MS测定烟叶中的痕量硒

为准确测定烟叶中的痕量硒,本研究使用三重四极杆ICP-MS进行测定,并与单四极杆ICP-MS进行比较。试验表明,三重四极杆ICP-MS采用两级质谱进行质量筛选,选择O2作为反应气体,将待测元素Se质量数转移到无干扰的质量数区域,能消除多原子离子和双电荷离子的干扰,可获得更加准确的结果。78Se、80Se和82Se三种同位素的回收率分别为99.1%、98.3%、99.2%,相对偏差(RSD)分别为1.59%、2.07%、1.32%,线性相关系数r>0.9999。结果还表明,三重四极杆ICP-MS方法测定烟叶中的痕量硒受干扰因素小,可获得更准确结果。

Determination of Trace Selenium in Tobacco by Triple Quadrupole ICP-MS

In order to determine trace element selenium in tobacco leaves accurately, a triple quadrupole ICP-MS method was used to determine trace selenium in tobacco leaves, and the results were compared with that from single quadrupole ICP-MS. The results showed that when triple quadrupole ICP-MS was used for mass screening by bipolar mass spectrometry, O₂ was chosen as reaction gas to transfer the mass number of Se to the undisturbed region, the interference of polyatomic ions and double charged ions can be eliminated and more accurate results can be obtained. The recovery rates of the isotopes ⁷⁸Se, ⁸⁰Se and ⁸²Se were 99.1%, 98.3%, 99.2% respectively. The relative deviation (RSD) was 1.59%, 2.07%, and 1.32% respectively. The linear correlation coefficient was r>0.9999. It was indicated that the interference factor was small and the results were more accurate for the determination of trace selenium in tobacco by triple quadrupole ICP-MS.