利用ICP—AES法测定中药材中铅、镉、铜含量的研究

建立了利用ICP—AES测定中药材中重金属元素铅、镉、铜的轴向观测方法，对轴向观测和横向观测的精密度结果和样品测定结果进行了比较。结果表明，采用轴向观测方式测得Pb、cd、cu的检出限（Ct．）分别为3．1ng·mL^-1、0．4ng·mL^-1、1．7ng·mL^-1；相对标准偏差（RSD）均小于5％；平均加标回收率分别为102．3％、101．8％、101．1％。轴向观测方式能满足中药材中铅镉铜的检测要求，横向观测方式不符合要求。

Research on ICP-AES determination of lead and cadmium and copper in traditional Chinese medicine

Axial observation method for determination of heavy metals Pb, Cd and Cu in Chinese herbal medicines using ICP-AES is established. Comparing the axial observation method with horizontal observation method in terms of precision of results and measurement results of samples, the results show that by axial observation method, the detection limits （CL） of Pb, Cd and Cu are 3. i ng · mL^-1 , 0. 4 ng·mL^-1 and 1.7 ng· mL^-1 respectively; the relative standard deviation （RSD） is less than 5%; the average recoveries are 102.3% , 101.8% and 101. 1% respectively. Axial observation method meets requirements of the testing of Pb, Cd and Cu in Chinese herbal medicines, while the horizontal observation method is not suitable for it.