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Fig. 4. Comparison of the pre-edge region for edge-normalized XANES spectra for PO4 adsorbed in mixed-mineral systems (June 2002) at selected concentrations with spectra for averaged standards for PO4 adsorbed on boehmite or ferrihydrite at pH 6.0 ± 0.1. Least square linear fits to the mixed-mineral systems using a combination of the averaged standards for PO4 adsorbed on boehmite or ferrihydrite are also included. Numbers in the legend denote adsorbed PO4 concentrations in mmol kg–1.
