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Predicting Aluminum and Soil Organic Matter Solubility Using the Mechanistic Equilibrium Model WHAM

^a Norwegian Forest Research Institute, Hoegskoleveien 12, N-1432 Aas, Norway
^b Dep. of Chemistry, Univ. of Oslo, P.O. Box 1033 - Blindern, N-0315 Oslo, Norway
^c Dep. of Soil and Water Sciences, Agric. Univ. Norway, Box 5028, N-1432 Aas, Norway

View larger version (32K): [in a new window]   Fig. 1. Results of equilibrium experiments Batch-1 (a–c) and Batch-2 (d–f). In Batch-1, acid or base was added to Soil A and Soil C. In Batch-2, AlCl3 was added to Soil A and Soil C. Soil A has a higher Al content than Soil C. Open symbols represent observations for Soil C, and closed symbols for Soil A. Lines are WHAM simulations (dotted is Soil C; solid is Soil A). Note that the Y-axis for Al-qr is different for Batch-1 and Batch-2. Error bars show standard errors.

View larger version (20K): [in a new window]   Fig. 2. pH–pAl (negative logarithm of Al activity) for equilibrium experiments Batch-1 and Batch-2 for Soils A and C. Soil A has a higher Al content than Soil C. Symbols represent observations and lines are WHAM simulations.

View larger version (20K): [in a new window]   Fig. 3. pH–DOC for equilibrium experiments Batch-1 (a) and Batch-2 (b) for Soils A and C. Soil A has a higher Al content than Soil C. Symbols represent observations and lines are WHAM simulations.

View larger version (24K): [in a new window]   Fig. 4. pH–pAl relationships in Soil A for equilibrium experiment Batch-1 and for solutions collected in the field using tension and zero-tension lysimeters. Regression lines are also shown.

View larger version (21K): [in a new window]   Fig. 5. WHAM simulations of concentrations of H+, inorganic Al, and DOC for soil to solution ratios (SSR) of 10, 50, 100, and 200 g L-1 against Cl concentrations in Soil A. Field measurements (tension lysimeters) are also shown. Symbols represent observations and lines are WHAM simulations.