Determination of Trace Selenium in Kangbixi by Intermittent Flow-Hydride Generation-Atomic Fluorescence spectrometry

A procedure of intermittent flow-hydride generation-atomic fluorescence is developed for the determination of selenium in kangbixi. The factors that affect the determination of selenium such as reducer concentration, medium acidity and some instrumental conditions are optimized by orthogonal design. Under the optitum conditions, the detective limit is founded to be 0 0469 μg/L, the the fluorescence intensity is linear to the concentration of selenium in the range of 0 0～80 0 μg/L, correlation coefficent is 0 9998, relative standard deviation is below 5%, the recovery reachs 101 45%.