红河州不同地区野山茶中微量元素的对比研究

研究了火焰原子吸收法连续测定野山茶中微量元素的工作条件，并以相同方法制备了红河州蒙自、石屏、弥勒等4个县市的野山茶实验样品，分别测定了此4个县市的野山茶样品中Pb, Cr, Cd, Cu等九种微量元素的含量，实验方法的相对标准偏差在0.07%～1.67%之间, 回收率在98.7%～116.4%之间。结果表明，对人体有害的元素Pb，Cd，Hg含量最高的是建水县野山茶样品，分别为53.47和6.03，7.68 μg·g-1。有益元素Mn在测定的元素中含量最高，平均含量高达913.48 μg·g-1；Fe作为半微量元素，其平均含量低于锰，为688.46 μg ·g-1；Zn的平均含量为116.64 μg·g-1。从实验样品中未能检测出Se。从实验结果得出，在红河州的野山茶中含有人体内必须的微量元素Mn，Fe，Zn等，野山茶具有一定的开发价值。

Comparative Study on Trace Elements in Elsholtzia bodineri Vaniot. from Honghe by FAAS

In the present paper, the authors prepared all the samples by the same method, and optimized the work conditions for flame qtomic absorption spectrometry. FAAS was applied to determine the trace elements, such as Pb, Cr, Cd, Cu, Zn, Hg, Se etc, in Elsholtzia bodineri Vaniot. from Mengzi, Shiping, Mile and Jianshui located in Honghe state. The method is simple, rapid and accurate, and allows simultaneous determination of many elements. The recoveries were in the range of 98.7%-116.4%，and RSD was 0.07%-1.69%. The contents of Pb, Cd and Hg were 53.47, 6.03 and 7.68 μg·g-1,respectively, in the sample from Jianshui, and were higher than those from other areas. The content of Mn was the highest, and was higher in Mengzi than in other areas, and the average content in the four samples was 913.48 μg·g-1,which was higher than the content in the soil. Fe is the semi-microelement whose average content in Elsholtzia bodineri Vaniot. from Honghe was 688.46 μg·g-1,the high-to-low content sequence of Fe in terms of location was Mengzi, Mile, Shiping and Jianshui. The average content of Zn was 116.64 μg·g-1,and the highest one was from Shiping. But we did not obtain the data of Se in the Elsholtzia bodineri Vaniot. from Honghe state by AAS, and did not detect Hg in samples from Shiping and Mile. The content of the detected elements in Mengzi’s sample had the sequence as follows; Mn>Fe>Zn>Pb>Cu>Cr>Cd>Hg>Se, while the sequence was Mn>Fe>Zn>Pb>Cu>Hg>Cd>Cr>Se in the sample of Jianshui, Mn>Fe>Zn>Pb>Cu>Cd>Cr>Hg>Se in Shiping, and Fe>Mn>Zn>Pb> Cu>Cd> Cr>Hg>Se in Mile. The results show that the content of the trace elements is high, especially, Mn, Fe and Zn, in Elsholtzia bodineri Vaniot. in Honghe. Therefore, Elsholtzia bodineri Vaniot., which can be used as drug or beverage, is worth exploitation.