微波消解-CTAB增敏-HG-ICP-AES法测定中药黄芪中的痕量铅

采用微波消解技术处理样品，建立了CTAB增敏-氢化物发生-电感耦合等离子体发射光谱法(HG-ICP-AES)测定中药黄芪中痕量铅的分析方法。讨论了微波消解试剂、微波消解参数对消解效果的影响，系统地研究了氢化物发生的最佳条件。采用HNO₃+H₂O₂+H₂O为微波消解最佳试剂，在选定的最佳氢化物发生条件下，铅的线性范围为0.23～800 μg·L-1, 相关系数为0.999 9，检出限为0.23 μg·L-1,相对标准偏差为1.02%, 样品加标回收率为98.8%～100.1%。结果表明，微波消解法处理中草药，具有快速、简便、节省试剂、消解完全等特点，测定结果的精密度和准确度令人满意。

Determination of Trace Lead in Traditional Chinese Herbal Medicine Astragalus by Microwave Digestion-CTAB Enhancing-Continual Flow Ingection Hydride Generation-ICP-AES

A new method using microwave digestion technique was developed for the determination of lead in Astragalus by CTAB enhancing-continual flow hydride generation-inductively coupled plasma atomic emission spectrometry (HG-ICP-AES). The experimental conditions of microwave digestion and hydride generation were optimized. This method shows a linear range of 0.23-800 microg x L(-1) and the correlation coefficient is 0.999 9. It is satisfactory to apply the microwave digestion procedure to the determination of Pb under the optimized conditions. The detection limit of the method is 0.23 microg x L(-1) and the RSD is 1.02%. The recovery obtained is 98.8%-100.1%. The results show that this method is rapid and simple with low environmental contamination and complete digestion of samples.