Fig. 5. Temporal changes in dissolved PO₄ for selected abiotic reduction experiments on suspensions containing 0.5 g ferrihydrite kg^–1; 0, 0.002, 0.008, or 0.3 g boehmite kg^–1; and 750 mmol P kg^–1 ferrihydrite. Each suspension containing boehmite exhibited trends analogous to those shown.