微波消解-ICP-AES法测定新疆贯叶连翘中的微量元素

Determination of Elements of Hypericum Perforatum L. in Xinjiang by Microwave Digestion-ICP-AES

微波溶样技术具有方便快捷、节约试剂、污染少和样品溶解完全等特点。采用HNO3 HClO4 (5∶1)作消解剂进行微波溶样 ,利用ICP法同时测定新疆贯叶连翘中Fe ,Ca,Mg ,Zn ,Mn ,Cu ,Na ,K ,Al,Ba,Pb和Cr等元素 ,进行了微波消化条件的选择及消化结果精密度实验 ,方法的回收率在 93 2 %～ 10 3 0 % ,测定的RSD(n =11)在 0 4 %～ 2 9%之间。并利用国家标准物质灌木枝叶GBW0 76 0 2验证了方法的准确度 ,测定值与标准值基本吻合。实验结果表明 ,此方法获得了满意的精密度和准确度。

ySample digestion by microwave is of some merits: simple, rapid, saving agents, nonpollution and being easy digested. HNO3 . HClO4(5: 1) was used as a microwave digestion agent. A direct method is reported for the determination of Fe, Ca, Mg, Zn, Mn, Cu, Na, K, Ba, Al, Pb and Cr in Hypericum perforatum, L. in Xinjiang by inductively coupled plasma atomic emission spectrometry(ICP-AES). The selection of digestion conditions of the technique is described. The recoveries for these elements were 93.2%-103.0%, and the relative standard deviation ( RSD) of the twelve samples were 0.4%-2.9%. According to standard sample GBW07602 bush twigs and leaves, the authors checked the method for accuracy and precision. The results were found to be basically consistent with the reference values. It was proved that the method features satisfactory precision and accuracy. The method was applied to the determination of plant materials with good agreement.