In this study, chloride tracer, silver nanoparticles (AgNPs) and silver ions (Ag+) were injected into a background solution flowing through laboratory columns packed with water-saturated glass beads.  Effluent concentration vs time breakthrough curves were measured.  It was observed that both Ag+ and AgNPs were retarded with respect to the tracer.  Ag+ transport could be simulated using a model that assumed advection, dispersion, and rate-limited sorption. AgNPs transport could be simulated using filtration theory, with a rate constant that models capture of the AgNPs by the glass bead media.  These results indicate the potential of captured AgNPs to be a long-term source of Ag+.

Fate and transport of silver nanoparticles and silver ions in saturated porous media: Laboratory experiments and modeling

244th National Meeting (2012)

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