锰、锌元素在烟叶中的含量及分布特征

Contents and Distribution of Mn and Zn in Flue-cured Tobacco Leaves

重金属元素含量的高低会影响卷烟的安全性,为摸清重金属元素在烟叶中的分布特征,将单片烟叶划分为A、B、C三个区域,利用电感耦合等离子体原子发射光谱仪(ICP-OES)对不同部位烟叶中Mn、Zn含量进行测定,结果表明:(1)山东临沂烟区烟叶中Mn、Zn平均含量分别为(124.90±16.72)和(29.45±7.83)mg/kg。(2)在整个烟株中,Mn含量分布为下部叶>中部叶>上部叶,Zn含量分布为上部叶>中部叶>下部叶。(3)单片烟叶中Mn和Zn含量均基本呈现出从边缘向中心逐渐升高的趋势,在各个区域中,Mn和Zn含量均为从叶基和叶尖向叶片中部逐渐升高。研究对于烟叶的工业应用有一定指导意义。

The content of heavy metals in tobacco leaves has great influence on the safety of cigarettes. To make the distribution ofheavy metals in flue-cured tobacco leaves clear, ICP-OES was applied to test the distribution of Mn and Zn in flue-cured tobaccoleaves. Each tobacco leaf was divided into 3 zones, namely A and B and C. It was found that: (1) The average contents of Mn and Znin flue-cured tobacco leaves from Linyi tobacco areas were (124.90±16.72) and (29.45±7.83) mg/kg. (2) The content of Mn was thehighest in lower tobacco leaves and the least in upper leaves. However, the content of Zn was the highest in upper leaves and theleast in lower leaves. (3) The contents of Mn and Zn both showed a trend of getting higher from edge to center of a tobacco leaf. Thecontents of Mn and Zn were both less in the base and top, and higher in the center of a single tobacco leaf. This study could provideguidance for industrial application of tobacco leaves.