Abstract
Chromium XAFS spectroscopy has been used to determine the relative amounts of Cr(VI) and Cr(III) in ash samples obtained from coal combustion. The method, which is based on the relative heights of the pre-edge peaks for the different Cr oxidation states in XANES spectra, can be used to speciate as little as 50 ppm of chromium in ash. The results indicate that the fraction of Cr(VI) oxidation state present in combustion ash from commercial combustion plants is typically at or close to the detection limit (approx. 3% of the total chromium). Such findings provide justification for a reappraisal of whether or not chromium should be considered a significant HAP in coal combustion.
Published Version
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