Fig. 4 Boron adsorption on 2:1 clays: (a) SAz-1 montmorillonite, ; (b) STx-1 montmorillonite, ; (c) SWy-1 montmorillonite, ; (d) IMt-1 illite, , (e) Fithian illite, ; (f) Morris illite, . Squares represent experimental data. Model fits are represented by solid lines. Model predictions are represented by dashed lines. Initial B concentration = 0.463 mM