超声波辅助提取-悬浮液进样-FAAS测定银杏叶中微量元素

将超声波辅助提取与悬浮液进样技术相结合，采用火焰原子吸收光谱法(FAAS)测定银杏叶中的微量元素的含量。在最佳仪器条件下对介质的影响、化学干扰、超声波时间、检测限及加标回收率进行考察。结果表明：相对标准偏差小于2.2%，回收率97.8%～104%。方法简便、快速，可用于银杏叶中批量微量元素的准确测定。

Determination of Trace Elements in Ginkgo Leaves by Flame Atomic Absorption Spectrometry Coupled with Suspension Injection and Ultrasound-assisted Extraction

Flame atomic absorption spectrometry (FAAS) coupled with ultrasound-assisted extraction and suspension sample injection was used to determine the contents of trace elements in ginkgo leaves. FAAS working parameters, suspension medium and length of ultrasonic treatment time were optimized and the eliminating effect of SrCl2 addition on the disturbance from Al, Si and P was evaluated. Meanwhile, two analytical figures of merit, namely limit of detection and spike recovery, were characterized. The relative standard deviation of each element was less than 2.2% and recovery rate of each sample was in the range of 97.8% to 104%. The method is simple, rapid and accurate and consequently, provides a promising method for the determination of trace elements in ginkgo leaves.