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GEOsciences

  (Formerly Journal of the Czech Geological Society)

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Received: 18 October 2019
Accepted: 6 March 2020
Online: 12 March 2020
H. Editor: J. Plášil
 
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Original paper

Lucy M. Mottram, Samuel Cafferkey, Amber R. Mason, Tom Oulton, Shi Kuan Sun, Daniel J. Bailey, Martin C. Stennett, Neil C. Hyatt

A feasibility investigation of speciation by Fe K-edge XANES using a laboratory X-ray absorption spectrometer

Journal of Geosciences, volume 65 (2020), issue 1, 27 - 35

DOI: http://dx.doi.org/10.3190/jgeosci.299



We demonstrate effective speciation of Fe in model compounds from analysis of the weak pre-edge features in Fe K-edge XANES spectra, with a commercially available laboratory X-ray spectrometer, using a spherically bent crystal analyser and a low power X-ray tube, in Rowland circle geometry. Direct comparison with XANES data acquired from a third generation synchrotron bending magnet beamline, using the same specimens, validated quantitative agreement in determination of the total integrated intensity and centroid position of the pre-edge feature, which are a probe of the electronic configuration and symmetry of the absorber atom, and hence oxidation state and co-ordination number. This work opens the door to rapid and routine speciation studies of Fe by laboratory XANES, even for materials with relatively dilute absorber concentration of only a few mol. %.

Journal of Geosciences, Published by © Czech Geological Society, with support from the Czech Geological Survey.
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ISSN: 1803-1943 (online), 1802-6222 (print)
email: jgeosci(at)jgeosci.org
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SNIP (Scopus, 2019): 0.914

IF (ISI, 2019): 1.279

5 YEAR IF (ISI, 2019): 1.45

Policy: Open Access

ISSN: 1802-6222

E-ISSN: 1803-1943