微波消解-电感耦合等离子体质谱法同时测定烟草中27种元素

在烟草中的有机和生物活性成分被鉴定出来之后，分析和鉴别其中的无机元素就变得非常重要。采用电感耦合等离子体质谱法同时测定了烟叶中Be，Na，Mg，K，Ti，V，Cr，Mn，Fe，Co，Ni，Cu，Zn，As，Se，Sr，Mo，Ag，Cd，Sn，Cs，Ba，Hg，Tl，Pb，Th和U共27种元素。样品的前处理采用硝酸和过氧化氢混合溶液。通过在线加入内标液的方法来校正由于基体效应和信号漂移对测量所造成的影响，内标选用锗、铟和铋3种元素。方法的回收率为93.64%～108.9%，检出限为0.356 3 ng·L-1～1.725 μg·L-1,相对标准偏差1.28%～9.18%。实验结果表明该方法能满足痕量分析的要求。

Determination of 27 Elements in Tobacco by ICP-MS Using Microwave Digestion for Sample Preparation

While the organic and biologically active components in tobacco smoke are well characterized, it is also important to know which inorganic elements are contained in tobacco. In the present paper, the determination of Be, Na, Mg, K, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Sr, Mo, Ag, Cd, Sn, Cs, Ba, Hg, Tl, Pb, Th and U in tobacco leaves was studied by inductively coupled plasma mass spectrometry. Samples were digested in a mixture of nitric acid and hydrogen peroxide by closed-vessel microwave digestion. The instrumental operating conditions were optimized for the measurement of above 17 elements. Ge, In and Bi were used as internal standard elements to compensate matrix effect and signal drift. The precision of measurement ranges from 1.28% to 9.18% in terms of relative standard deviation. The recoveries for spiking tobacco samples and the limits of detection are in the range of 93.64%-108.9% and 0.356 3 ng x L(-1)-1.725 microg x L(-1), respectively. The results of experiment show that the method can meet the requirements of trace analysis.