中国烟叶铅、镉、砷的含量及分布特征
Contents and Distribution of Pb, Cd and As in Chinese Tobacco Leaves
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摘要: 研究了我国烟叶主产区2004年生产的497份烤烟样品和17份白肋烟样品中铅、镉、砷的含量及分布特征。结果表明:我国大部分产区烤烟烟叶铅和镉含量低于4mg/kg,砷含量低于0.5mg/kg,铅和镉可能是目前我国烟叶中的主要重金属元素;白肋烟的铅和镉含量高于烤烟,砷含量则是烤烟高于白肋烟;在当前烤烟生产中,品种对烟叶铅、镉和砷积累的影响远小于生态环境条件和土壤元素背景值,因此,可以忽略品种的影响;不同产区烤烟的铅、镉和砷含量存在显著差异,铅和镉含量的差异大于砷,烤烟中这3种元素的含量均存在一定的地域分布,铅和镉的地域分布相对明显,砷则相对较弱。Abstract: The contents and distribution of Pb, Cd and As in 497 flue-cured and 17 burley tobacco leaf samples collected from major tobacco production regions of China in 2004 were studied.The results suggested that in most flue-cured tobacco samples, the contents of Pb and Cd were less than 4mg/kg, and the content of As was less than 0.5mg/kg;and Pb and Cd might be the main heavy metals in fluecured tobacco in China.Burley tobacco has higher Pb and Cd contents than flue-cured tobacco does, while the content of As is higher in flue-cured tobacco;the major factors which influence the accumulation of Pb, Cd and As in tobacco are environment and the background values of these elements in soil, the influence of tobacco cultivar is negligible.Significant differences in Pb, Cd and As contents were observed between samples from different regions, it suggested that the three elements were regionally distributed markedly for Pb and Cd, and less visible for As.
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