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Figure 2
(a) Fe-XANES spectra from seven rhyolite standards with Fe3+/ΣFe between 0.238 and 0.805 (Cottrell et al., 2009BB6). The horizontal dashed line represents a normalized intensity of 0.8 (Method A) and the vertical dashed lines correspond to the points E1 = 7138.4 eV and E2 = 7175.0 eV, with the ratio of the normalized intensity at E1 and E2 used to determine the Fe3+/ΣFe concentration (Method B). (b) Results from Method A (orange solid line, lower axis) and Method B (blue dashed line, upper axis). The error bars in (b) represent the limits of the range from three measurements (Cottrell et al., 2009BB6).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 27| Part 1| January 2020| Pages 207-211
https://doi.org/10.1107/S1600577519014267
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