Fig. 6. Phosphorus K-XANES spectra with an inset of the white-line region (a) and the pre-edge region of XANES spectra (b) for moist samples collected at various times from an abiotic reduction experiment on a suspension containing 1:1 by mass ferrihydrite/boehmite and 750 mmol P kg^–1 total solids. Spectra for standards of PO₄ adsorbed on boehmite (500 mmol kg^–1) or ferrihydrite (1000 mmol kg^–1) and noncrystalline (non-xl) Al(III)- and Fe(III)-phosphate are included.