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Figure 4
(a) Stacked As K-edge µ-XANES spectra collected on the XFM beamline from individual As-enriched spots across a 200 µm × 200 µm region (ROI-200, see Fig. S2) of the sand grain, along with overlaid fits (points) as given in Table 4[link]; and (b) arsenic standards that were included in best fits to sample spectra from different spots.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 26| Part 6| November 2019| Pages 1967-1979
https://doi.org/10.1107/S1600577519012785
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