Fig. 5. Changes in E_H with time for Hanford (HA) and Imperial (IM) soil–water suspensions for samples with varying amounts of Fe or Mn (hydr)oxides (as solid–liquid suspensions) and S compounds. Abbreviations for Fe (hydr)oxides are ferrihydrite (Fh), goethite (Gt), hematite (Hm), and magnetite (Mag). Concentrations (in mM) are listed following sample label.