Abstract: It was is reported in this paper that the microwave digestion technique was used in the ion - exchange - separation hydride generation atomic fluorescence spectrometry determination of trace selenium in a-garic. The optimum conditions for the determination were tested and discussed. The detection limit was 0. 16ng/ ml. The recoveries of the method were 96. 2% ~ 98. 0% and RSD 1. 6% . This method was accurate, quick -acquired and convenient. It was used in the determination of trace selenium in agaric with satisfactory result.

Key words: Microwave digestion of samples , Hydride generation - atomic fluorescence spectrometry Ion exchange , Selenium Agaric