“…Since heating accelerates the phase transition of Fe-(hydr)oxides, it is sometimes used as an experimental technique to study long-term changes in Fe-(hydr) oxides. For example, heating at 900°C increased the thermodynamic stability of amorphous Fe-oxides, but the waterextractability of Cd, Zn and Pb increased significantly (Sørensen et al, 2000). During aging of ferryhydrite (pH 6, 40 and 70°C), sorption increased for Mn and Ni, while Pb and Cd showed an enhanced desorption with aging (2 to 6 weeks) (Ford et al, 1997).…”