Abstract
A procedure that uses extended X-ray absorption fine structure (EXAFS) spectroscopy for quantitative chromium(III) speciation in neat solid mixtures is described. The procedure uses the full, filtered EXAFS, e.g., 4 ≤ <i>k</i> ≤ 12 Å<sup>-1</sup>, rather than the smaller <i>k</i>-range associated with a single coordination sphere. Concentration is determined by a simple correlation of full, filtered EXAFS of standards with full, filtered EXAFS of mixtures. Under optimized conditions, calibration curves for mixtures of Cr<sub>2</sub>O<sub>3</sub> and Cr(NO<sub>3</sub>)<sub>3</sub>] · 9H<sub>2</sub>O have slopes of 1.002, respective intercepts of -0.7% and 0.5%, and correlation coefficients of 0.9991. Fluorescence EXAFS from mixtures must be compared to fluorescence EXAFS from standards, and the matrices and thicknesses of standards and mixtures must be closely matched. Transmission EXAFS of standards must be obtained to correct for self-absorption effects.
PDF Article
More Like This
Dispersive soft x-ray absorption fine-structure spectroscopy in graphite with an attosecond pulse
Bárbara Buades, Dooshaye Moonshiram, Themistoklis P. H. Sidiropoulos, Iker León, Peter Schmidt, Irina Pi, Nicola Di Palo, Seth L. Cousin, Antonio Picón, Frank Koppens, and Jens Biegert
Optica 5(5) 502-506 (2018)
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription