Determination of selenium in food by L-Cysteine atomic fluorescence spectrometry

Objective:In this paper,we give a method for determination of selenium in food by hydride generation-atomic fluorescence spectrometry in the presence of L-Cysteine.Methods: Using 2% hydrochloric acid as carrier liquid,the samples were determined by atomic fluorescence spectrometry after been digested by heating in acid.Results: The measurement range of this method was 10.0 μg/L~50.0 μg/L,the RSD 0.7%~1.9%,the recoveries were in the range of 93.0%~101.0% and the detection limits of this method were found to be 0.051 μg/L.Conclusion: In the presence of L-Cysteine,the hydride generation conditions were improved,the spectrometric signal was enhanced,and the acidity of solution was reduced.In addition,the interferences of the metal elements were significantly inhibited.The method can be used to determine seleium in food.