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Solubility of Aluminum and Silica in Spodic Horizons as Affected by Drying and Freezing

^a Dep. of Soil Sciences, Swedish Univ. of Agricultural Sciences (SLU), Box 7014, SE-750 07, Uppsala, Sweden
^b Division of Land and Water Resources, Royal Inst. of Technology (KTH), SE-100 44, Stockholm, Sweden

View larger version (35K): [in a new window]   Fig. 1 Solubility of Al relative to gibbsite (Al(OH)3) in fresh, frozen, and dried soils; logAl is log10 activity of dissolved Al3+. Broken lines indicate theoretical equilibrium with respect to crystalline gibbsite and microcrystalline gibbsite . Arrows indicate no addition of acid or base. Al solubility increased as a result of drying the soils

View larger version (22K): [in a new window]   Fig. 2 Solubility of Al and Si relative to imogolite (Al2SiO3(OH)4) in the Bs horizons investigated; logSi is log10 activity of dissolved H4SiO4. The broken lines indicate equilibrium with respect to imogolite . Arrows indicate no addition of acid or base

View larger version (68K): [in a new window]   Fig. 3 Titration curves with fresh, frozen, and dried soils. Plots of added base - acid (OH- - H+) vs. free H+, dissolved Alqr, base cations other than Na+, and monomeric silica; 1 mM of acid or base corresponded to 1 cmolc kg-1. Drying caused substantial changes in dissolved H+ and Si