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Modeling Aluminum and Organic Matter Solubility in the Forest Floor Using WHAM

^a Norwegian Forest Research Inst., 1432 Ås, Norway
^b Dep. of Environmental Protection Engineering, Technical Univ. of Lublin, Lublin, Poland

View larger version (23K): [in a new window]   Fig. 1 Titration curves showing the effect of base–acid additions on pH for different bound Al ratio (BAR) values. Lines show WHAM simulations

View larger version (23K): [in a new window]   Fig. 2 Titration curves showing the effect of base–acid additions on concentrations of quickly reacting Al for different bound Al ratio (BAR) values. Quickly reacting Al includes all monomeric Al species except Al–F complexes. Lines show the WHAM simulations of inorganic Al species. Note the different scale of the y-axes

View larger version (22K): [in a new window]   Fig. 3 Aluminum solubility as a function of pH and bound Al ratio (BAR) compared with solubility of amorphous gibbsite. Symbols refer to measured pH values and to Al3+ activities calculated by ALCHEMI. Lines show WHAM simulations of pH and Al3+ activity

View larger version (26K): [in a new window]   Fig. 4 Dissolved organic C (DOC) solubility as a function of pH and bound Al ratio (BAR) in Experiment A for a selection of BAR values. Insert shows DOC calculated by WHAM and observed pH. Note the change in scale of y-axis

View larger version (18K): [in a new window]   Fig. 5 Model descriptions (linear regression analysis and WHAM) simulations of Al solubility for bound Al ratio (BAR) 0.1 and 1. Symbols refer to measured pH values and to Al3+ activities calculated by ALCHEMI