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Kinetics of Arsenic Adsorption on Goethite in the Presence of Sorbed Silicic Acid

Dep. of Crop, Soil, and Environmental Science, 236 Smyth Hall, Virginia Tech, Blacksburg, VA 24061

View larger version (14K): [in a new window]   Fig. 1. Kinetics of As adsorption on goethite as a function of pH, (a) As(III), (b) As(V). As = 0.10 mM, ionic strength (I) = 0.01 M, and goethite suspension of 1.0 g L-1.

View larger version (21K): [in a new window]   Fig. 2. Kinetics of silicic acid adsorption on goethite as a function of pH. Ionic strength (I) = 0.01 M, and goethite suspension of 1.0 g L-1.

View larger version (17K): [in a new window]   Fig. 3. Kinetics of As adsorption on goethite at pH = 4 in the presence and absence of silicic acid, (a) As(III) and silicic acid, (b) As(V) and silicic acid. As = 0.10 mM, ionic strength (I) = 0.01 M, and goethite suspension of 1.0 g L-1.

View larger version (17K): [in a new window]   Fig. 4. Kinetics of As adsorption on goethite at pH = 6 in the presence and absence of silicic acid, (a) As(III) and silicic acid, (b) As(V) and silicic acid. As = 0.10 mM, ionic strength (I) = 0.01 M, and goethite suspension of 1.0 g L-1.

View larger version (17K): [in a new window]   Fig. 5. Kinetics of As adsorption on goethite at pH = 8 in the presence and absence of silicic acid, (a) As(III) and silicic acid, (b) As(V) and silicic acid. As = 0.10 mM, ionic strength (I) = 0.01 M, and goethite suspension of 1.0 g L-1.

View larger version (17K): [in a new window]   Fig. 6. (a) Kinetics of As(V) adsorption on goethite as a function of pH, (b) Kinetics of As(V) adsorption alone at pH 9 and 10 and at pH 8 in the presence of 0.10 and 1.0 mM silicic acid. As(V) = 0.10 mM, ionic strength (I) = 0.01 M, and goethite suspension of 1.0 g L-1.