烟草中痕量汞的检测.pdfVIP

第2 卷　第3 期 烟 草 农 业 科 学 Vol.2　No.3 2006 年9 月 Tobacco Agricultural Science Sep.　2006 烟草中痕量汞的检测 * 吴玉萍，夏振远，雷丽萍 （云南省烟草科学研究所，云南 玉溪 653100 ） 摘　要：建立了硝酸—双氧水体系微波消解烟样，氢化物发生-原子荧光光谱法检测烟草中的Hg含量的试验方法。 并对样品前处理试剂的用量，介质盐酸的浓度、预还原剂的浓度和载流酸度等检测条件进行了优化试验。该方法 具有良好的线性（相关系数为0.9998）和重复性（相对标准偏差为5.43%~10.59%），灵敏度（检测限为0.022μg/L） 和回收率（93.2%~102.0%）较高。对旺长时期杀青烟样和初烤烟样进行汞检测的结果表明，初烤烟叶中汞含量 较旺长时期杀青烟叶中汞含量高。 关键词：原子荧光光谱法；检测；烟草；汞 中图分类号：O657.31 文献标识码：A Determination of Trace Mercury in Tobacco WU Yu-ping XIA Zhen-yuan LEI Li-ping （Yunnan Tobacco Research Institute , Yuxi 653100, China ） Abstract: Using microwave assisted digestion procedure with nitric acid- hydrogen peroxide system, hydride generation- atomic fluorescence spectrometry (HG-AFS), a method for the determination of total Hg in tobacco was developed. The Determination conditions including the reagent dosages for the sample pretreatment，the concentrations of HCl as the sample medium and reducer, the carrying gas acidity etc, were tested and optimized.The detection limit of the method was 0.022 μg/L, the relative standard deviations were ranged between 5.43%~10.59%, and the recovery rates ranged between 93.2%~102.0%. The analysis results by the method on tobacco samples showed that Hg contents in flue-cured tobacco samples were higher than those in the deenzymed tobacco samples collected during the vigorous growing period. Key word: Hydride generation-atomic fluorescence spectrometric; Detection; Tobacco; Hg 随着人们对环境问题和健康问题的日益重视，烟 ［2–4 ］ 荧光光谱法测定汞