氢化物发生原子荧光法测定中药(党参、黄芪、巴戟天)中的铅

Determintion of Trace Lead in the Traditional Chinese Medicine Using Hydride Generation Atomic Fluorescence Spectrometry

应用AFS2202a型双道原子荧光分光光度计和断续流动的氢化物发生技术,采用HNO3H2O2体系和高压釜消解中药样品测定了中药党参、黄芪、巴戟天中的铅。同时,研究了光电管负高压、灯电流、屏蔽气和载气流量、载流的选择,酸度的影响等。在选定实验条件下,铅的检出限为008μg·L-1,相对标准偏差为034%。该方法简便、快速、灵敏,对于实际中药样品的测定得到了满意的结果。

A hydride generation atomic fluorescence spectrometry method has been developed for the determination of trace lead in traditional Chinese medicines. A high pressure digestion using HNO3-H2O2 system was applied for the pretreatment of traditional Chinese medicine samples and the interval flow precedure was used. The experimental conditions and instrumental operating parameters such as KBH4 concentration, flow rates of carrier and shield gases, current of the lamp and height of the atomizer, have been optimized. Under the optimum conditions the detection limit is 0.08 mug(.)L(-1). The relative standard deviation is 0.34%. This method is simple, rapid and sensitive, so it can be successfully used for the determination of lead in traditional Chinese medicines.