XAFS Speciation Study of Selenium Compounds with Different Oxidation State in Soil and Combustion Ash

Abstract

X-ray absorption fine structure （XAFS） spectroscopy is one of the effective analytical methods to determine the chemical form of trace elements in the complex powder mixtures such as soil, coal ash, sludge, and so on. XAFS spectra with different oxidation state of selenium （Se） compounds were collected in order to estimate the chemical form such as an oxidation state and a mixing ratio from the near edge XAFS spectra of Se. X-ray absorption energy and shape of the near edge spectra were sensitively varied in the range from 12,656 to 12,667eV with increasing the oxidation number of Se. It was found that the chemical form of Se contained in coal ash was able to estimate by using a linear fitting analysis with the collected XAFS spectra of this study.