微波消解-AAS法测芦荟中微量金属元素锌、锰、镉、铅

应用具有压力控制附件的MSP-100D型微波样品制备系统，进行新鲜芦荟叶外皮及凝胶中锌、锰、镉、铅元素的微波消解研究，并采用原子吸收法测定其元素的含量。讨论了混合酸体系、混酸配比、固液比和微波消解时间对于微波消解结果的影响。在混合酸体系HNO3-HCl中，当混酸HNO3-HCl配比为8：3、固液比为1：12、最高功率时微波消解时间为6min的条件下，消解结果最佳。在微波消解最佳条件下，进行了精密度实验和回收率实验，所得结果的相对标准偏差均在0．3％～6．2％之间，回收率在95．0％～110．0％之间。结果表明，微波消解法处理新鲜芦荟叶片，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 Zinc, Manganese, Cadmium and Lead in Aloe by Microwave-Digestion Atomic Absorption Spectrometry

A microwave digestion procedure was developed for the determination of trace Zn, Mn, Cd and Pb in aloe-leaf cuticle and aloe-leaf gelatin, using the obturated vessel microwave digestion system with a pressure controlling part, and the amounts of these trace metallic elements were determined by atomic absorption spectrometry after microwave digestion. The effects of the composition of digestion solution, the ratio of the sample to digestion solution, and the digestion time were studied. It is satisfactoty to apply the microwave digestion procedure to the determination of Zn, Mn, Cd and Pb under the optimized condition with the recovery of 95.0% to 110.0% and RSD of 0.3% to 6.2%. The results show that this method is rapid and simple with low environmental contamination and complete digestion of the sample.