Figure 5
Upper panel: experimental XANES spectra at the Fe K-edge of Fe2+ (red solid line), Fe3+ (black solid line) and 50% Fe2+ + 50% Fe3+ (blue dashed line) of 0.1 M solutions in water at pH = 1. Lower panel: comparison of the XANES spectrum of the mixed Fe3+–Fe2+ solution with the weighted addition of the Fe2+ and Fe3+ solution spectra in a 1:1 ratio. |