Preparation: |
prepared on the basis of the method of [APQ67] as described in detail by [HDV89]. Freshly prepared 0.5 M Fe(NO3)3 was slowly titrated with 2.5 M NaOH to pH 12. The suspension was aged for 4 days at 60 °C and subsequently dialyzed in ultrapure water. Before using it in the experiments, the goethite suspension was acidified (pH ~5) to desorb and remove the (bi)-carbonate by continuously purging it with N2 for at least 1 day. |