Preparation: |
produced by the instantaneous addition of 0.02 M NaOH to a 0.9 L solution of ∼3.50 mM Fe(NO3)3 in
0.01 M HNO3 until pH ∼8.5 was reached; after centrifugation for 20 minutes, the precipitate was re-suspended in 0.01 M NaNO3 to a typical final volume of 150 mL, resulting in ∼2–2.5 g of Fh per L at a molar mass of Mnano = 94.8 g mol−1 Fe; aged in a closed bottle at room temperature over 4 hours since the neutralization |