密闭微波消解-电感耦合等离子体质谱法测定烟用香精中多种微量元素

Determination of Trace Elements in Cigarette Flavours by Closed-Vessel Microwave Digestion-Inductively Coupled Plasma Mass Spectrometry

烟用香精对卷烟的香、吃味和质量稳定有重要影响,为了有效控制香精质量,降低卷烟主流烟气中有害元素的含量,采用密闭微波消解-电感耦合等离子体质谱法同时测定了烟用香精中铍、钒、铬、锰、镍、铜、锌、砷、硒、锶、钼、镉、铊和铅14种元素,方法的线性相关系数0.999 5-1.000 0,相对标准偏差1.3%-9.5%（n=5）,检出限0.003-0.13μg.L-1,加标回收率88.1%-109.3%。结果表明方法能够满足微量元素的分析要求。用实验方法测定了38个牌号烟用香精中铍、钒等14种元素的含量。结果发现：（1）香精中锰、锌、锶的含量较高,硒、镍、铬、铜次之,铍、铊、钼、镉、钒、铅和砷的含量最低,其平均值均小于0.1μg.g-1。（2）锰、镉、锶的含量在不同香精之间差别较大,其变异系数分别为276.4%,238.7%,243.8%。

Tobacco flavours have great effect on the aroma,taste and quality stabilization of cigarettes.In order to effectively control the quality of cigarette flavours and reduce the content level of toxic elements in cigarette mainstream smoke,a method for the simultaneous determination of Be,V,Cr,Mn,Ni,Cu,Zn,As,Se,Sr,Mo,Cd,Tl and Pb in cigarette flavours by inductively coupled plasma mass spectrometry（ICP-MS） with closed-vessel microwave assisted digestion was developed.The linear correlative coefficients for all elements are better than 0.999 4 and the precision of measurement ranges from 1.3% to 9.5% in terms of relative standard deviation（n=5）.The recoveries for the cigarette flavour samples and the limits of detection are in the range of 88.1%-109.3% and 0.003-0.13 μg·L-1,respectively.The results of experiment show that the method can meet the requirements of trace analysis.Thirty eight cigarette flavours from different cigarette manufacturing enterprises were determined.The results indicate that：（1） the contents of Be,Tl,Mo,Cd,V,Pb and As in cigarette flavours are very lower,the average values of which are all lower than 0.1 μg·g-1.The content levels of Mn,Zn and Sr in cigarette flavours are higher, and that of other 4 elements are moderate.（2） The content difference of Mn,Cd and Sr in different cigarette flavours is usually bigger,the coefficients of variation of which are 276.4%,238.7% and 243.8%,respectively.