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Desorption Kinetics of Cadmium²⁺ and Lead²⁺ from Goethite

Influence of Time and Organic Acids

^a Dep. Crop and Soil Environmental Sciences, 236 Smyth Hall, Virginia Polytech. Inst. & State Univ., Blacksburg, VA 24061
^b Sandia National Laboratories, Albuquerque, NM 87185

View larger version (14K): [in a new window]   Fig. 1. (A) Sorption of Pb2+ and Cd2+ on goethite as a function of pH. (B) Sorption of oxalate and salicylate on goethite as a function of pH. Goethite suspension density 5 g L-1 and a background electrolyte concentration of 0.01 M NaNO3.

View larger version (16K): [in a new window]   Fig. 2. Long-term sorption of Pb and Cd on goethite at pH 6.0. Goethite suspension density 5 g L-1 and a background electrolyte concentration of 0.01 M NaNO3.

View larger version (24K): [in a new window]   Fig. 3. Effect of residence time on the desorption kinetics of Pb2+ from goethite in the presence of 0.002 M salicylate.

View larger version (22K): [in a new window]   Fig. 4. First-order rate equation plots of Pb2+ and Cd2+ desorption from goethite in the presence of 0.01 M NaNO3 (A) k1 and (B) k2.

View larger version (22K): [in a new window]   Fig. 5. First-order rate equation plots of Pb2+ and Cd2+ desorption from goethite in the presence of 0.002 M oxalate (A) k1 and (B) k2.

View larger version (21K): [in a new window]   Fig. 6. First-order rate equation plots of Pb2+ and Cd2+ desorption from goethite in the presence of 0.002 M salicylate (A) k1 and (B) k2.