盐酸还原-氢化物原子荧光法测定人工北虫草中的硒

为建立氢化物原子荧光法测定人工北虫草中硒的方法,用浓盐酸替换硫脲-抗坏血酸对硒的预还原,考察了酸介质、KBH4质量浓度及共存元素的影响和干扰消除的方法,确定了最佳测定条件。结果表明,在最佳实验条件下,硒的最低检出限为0.2μg/L,RSD为1.9%~2.3%,回收率为108%~109%,该法具有简便,快速、灵敏度、准确度高、干扰少等优点。实际样品显示人工北虫草中含有丰富的硒。

Detemination of Selenium in North Cordyceps by Hydrochloride Reduction- Atom Fluorescence Spectrometry

A amethod for simultancous determination of selenium in north cordyceps by hydrochloride reduction atomic fluorescence spectrometry was developed.The result show that in the best condition,the limit of detection for selenium is 0.2 μg/L.The coefficient of variation for sample detection is 1.9%~2.3%.The recovery rate of selenium is 108%~109%.The method is simple,rapid and of high sensitive and accurate,less interfering.