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Figure 1
(a) Fe-XANES spectra from 11 synthetic basalt standards with Fe3+/ΣFe between 0.011 and 0.775. 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 = 7161.7 eV, placed either side of the isosbestic point ip, 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), where the error bars represent one standard deviation, calculated from the 200 individual measurements.

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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