石墨炉原子吸收光谱法分析药用植物中微量营养元素的含量

银杏、杜仲及绞股蓝的成熟青叶晾干并粉碎后经HNO3－HClO4(4:1)混酸消化，用石墨炉原子吸收法同时分析测定了消化液中的Se,Ge,Cu,Zn,Fe,Mn六种微量元素，方法简便快速。用该方法测定了桃叶标准物中的Ｃu,Zn,Fe,Mn四种微量元素，证明了测定结果准确可靠。实验结果表明这三种药用植物叶中Ｃu,Zn,Fe,Mn含量都较为丰富，特别是银杏叶中的Ｓe，绞股蓝中的Ｇe含量较高，对微量元素与中草药药效的关系进行了初步探讨。

Determination of Six Nutritional Elements in Chinese Herbal Medicines by Graphite Furnace Atomic Absorption Spectrometry

Method for the determination of nutritional elements in three kinds of chinese traditional and herbal drugs including leaves of Ginkgo biloba L., Eucommiales, and Gynostemma pentaphyllum (Thunb.) Makino were studied. Samples were collected in middle of autumn, washed in water and dried by airing. About 0.5 g accurately weighed sample was digested with mixed acid of HNO3-HClO4 (4:1). Six kinds of elements of selenium, germanium, copper, zinc, iron and manganese in the digested solution were determined by graphite furnace atomic absorption spectrometry (GFAAS) respectively. Accuracy of employed AAS method was tested by the determination of Cu, Zn, Fe, Mn in standard material of peach leaves. The results obtained show proposed GFAAS method is simple, accuracy, rapid and practicable. The contents of Cu, Zn, Fe, Mn in these plant leaves are high. Especially Se in Ginkgo biloba L. and Ge in Gynostemma pentaphyllum (Thunb.) Makino were obviously higher than other herbal drugs. They are worth much more comprehensive utilization. The relation between concentrations of these nutritional elements and curative effect was also discussed.