Fig. 2. Least-squares fits of the P K-XANES (X-ray absorption near-edge structure) spectra of the five soil samples: (A) sb2.1-A, (B) Ma2-A, (C) PV2-A, (D) Ma3-B, and (E) AI2-B (P/ferrihydrite, P/goethite, and P/alumina = PO₄ adsorbed on ferrihydrite, goethite, or alumina; octaCaPO₄ = octacalcium phosphate; hydroxyap. = hydroxyapatite; NC FePO₄ = noncrystalline FePO₄). For PV2-A and AI2-B, the first best fit among the best solutions reported in Table 3 is illustrated.