Determination of As in tea with on-line oxidation and pre-reduction coupled to hydride generation atomic fluorescence spectrometry

A simple,rapid method was developed for on-line determination of As in tea.In this method,an electromagnetic induction oven was used as heating source,As(Ⅴ) was prereduced to As(Ⅲ) by 25 g/L KI and 25 g/L ascorbic acid and determined by hydride generation-atomic fluorescence spectrometry(HG-AFS).The detection limit of As is 0.063 μg/L,the relative standard deviation(RSD) of samples is 2.5%.The proposed method can be successfully applied to the determination of trace As in tea.