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The detachment of latex colloids deposited in packed glass-bead columns was observed under conditions where the ionic strength was reduced and ion exchange between Na + and Ca 2+ occurred. For identical influent solutions producing colloid release, it was found that deposited colloids in equilibrium with Ca 2+ were released less readily than those in equilibrium...
Colloid release was observed from packed columns for two natural porous media (sands) and one model system (glass beads with deposited latex colloids). Colloid release was found to occur in all cases when the ionic strength was reduced in columns that were in equilibrium with Na + ions. Most of the released colloids from the natural porous media were smaller than 1 μm in size, and comprised...
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