Determination of Water Soluable and Exchangeable Se (IV) and Se (VI) in Soil by HG-AFS

The speciation analysis of selenium(including valency) is significant in enviroment,biology,food,and medicine science.Through experiment ,we optimize the determination conditions of hydride generation-atomic fluoresence spectrometry,and determine directly Se(Ⅳ) and total inorganic selenium after quantitative reduction to Se(Ⅳ) .The content of Se(Ⅵ) was obtained in the way of difference. The valencies and contents of water soluble and exchangeable selenium in two kinds of soil were reported. The method is simple and feasible.