Surface-Charge Repulsive Effects on the Mobility of Inorganic Colloids in SurfaceSystems. Annual Colloid and Surface Science Symposium (65th). Held in Norman, Oklahoma on June 17-19, 1991

摘要

Batch and column experiments using natural aquifer material investigated thespecific adsorption of anions onto charged inorganic colloidal surfaces in terms of enhanced colloid stability and transport in subsurface model systems. Variables in the study included flow rate, pH, ionic strength, aqueous chemical composition, colloid concentration and size. Specific adsorption of some anions resulted in enhanced colloid stability and transport of Fe2O3 particles due to increases in charge repulsion between the particles in suspension and between the particles and the immobile column matrix minerals. Extent of particle breakthrough was dependent upon a complex variety of parameters; however, the highest statistical correlation was observed with particle size and ionic composition of the supporting electrolyte.