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Modeling Arsenic(III) Adsorption and Heterogeneous Oxidation Kinetics in Soils

^a Dep. of Chem. and Biochem., San Francisco State Univ., 1600 Holloway Ave., San Francisco, CA 94132 USA
^b USDA-ARS, U.S. Salinity Lab., 450 W. Big Springs Rd., Riverside, CA 92507-4617 USA

View larger version (23K): [in a new window]   Fig. 1 Fractionation of As(III) and As(V) in As(III)-treated Indio, Panoche, and Fallbrook soils as a function of time. The pH values in the As(III) reaction solutions for the three soils were 6.5, 7.9, and 9.3 for Fallbrook, Panoche, and Indio soil, respectively

View larger version (44K): [in a new window]   Fig. 2 Hypothetical reaction pathways for As(III) and As(V) in soil. In this figure, Mn denotes a manganese oxide surface complex, whereas Me denotes all other oxide mineral surfaces that bind As in soil

View larger version (23K): [in a new window]   Fig. 3 (a) Effect of pH and time on soluble As(III), (b) PO4-exchangeable As(III), and (c) total recoverable As(III) in As(III)-treated Fallbrook soil

View larger version (21K): [in a new window]   Fig. 4 (a) Effect of pH and time on soluble As(V), (b) exchangeable As(V), and (c) total recoverable As(V) in As(III)-treated Fallbrook soil

View larger version (21K): [in a new window]   Fig. 5 Fitting a rate expression to soluble As(III) data evaluated for : (a) normalized soluble As(III) data in As(III)-treated Indio, Panoche, and Fallbrook soils with linear regression fits and (b) comparison of the experimental data (points) with the prediction using Eq. [18] (lines)

View larger version (27K): [in a new window]   Fig. 6 Normalized soluble As(III) data in As(III)-treated Indio, Panoche, and Fallbrook soils with linear regression fits to the fast(t < 2 h) and slow (t > 2 h) time ranges

View larger version (29K): [in a new window]   Fig. 7 Fit of the consecutive reaction rate model to soluble As(III) and As(V) in As(III)-treated Indio, Panoche, and Fallbrook soils

View larger version (26K): [in a new window]   Fig. 8 Fit of the consecutive reaction rate model to recoverable As(III) and As(V) in As(III)-treated Indio, Panoche, and Fallbrook soils

View larger version (30K): [in a new window]   Fig. 9 Fit of the consecutive reaction rate model to (a) soluble As(III) and immobile As and (b) soluble As(V) in As(III)-treated Aiken soil

View larger version (28K): [in a new window]   Fig. 10 Fit of the consecutive reaction rate model to recoverable As(III), recoverable As(V), immobile As in As(III)-treated Aiken soil