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The Influence of pH, Electrolyte Type, and Surface Coating on Arsenic(V) Adsorption onto Kaolinites

^a Unité de Sciences du Sol, INRA d'Orléans, av. de la Pomme de pin, BP 20619, Ardon, 45166 Olivet Cedex, France
^b Bureau de Recherches Géologique et Minière (BRGM), 3 avenue Claude Guillemin-B.P. 6009–45060 Orléans Cedex 2, France

View larger version (28K): [in a new window]   Fig. 1. Influence of initial As(V) concentration on adsorption onto kaolinite and kaolinite-Humic acid (HA) at two pH values (5 and 7) in 10-2 M Ca(NO3)2. (A) Adsorption isotherms. Solid/liquid partition coefficient (Rd) as a function of initial As(V) concentration at (B) pH 7 and (C) pH 5.

View larger version (13K): [in a new window]   Fig. 2. Influence of pH on As(V) adsorption onto kaolinite and kaolinite-humic acid (HA) for an initial As(V) concentration of 0.5 mg L-1 and in two electrolyte types: (A) in 10-2 M Ca(NO3)2 and (B) in 10-2 M NaNO3.