Determination of chromium oxidation state by X-ray fluorescence spectrometry: application to chromium(VI) and chromium(III) determination in occupational hygiene samples

Abstract

The K X-ray emission lines of chromium in several oxidation states have been studied and changes in peak position and profile observed. The changes have been related to oxidation state and ligand environment. These observations were employed in the determination of the Cr^VI to total Cr ratio by X-ray fluorescence spectrometry, the measurement of the Cr Kβ′ to Cr Kβ_1,3 intensity ratio being chosen as the most appropriate parameter. The method was applied to the determination of the Cr^VI content of welding fume samples.