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Abstract: Silver
nanoparticles (nAg) are widely used as antimicrobial agents in medical and consumer
products and represent a potential threat to natural environments. This research was
designed to assess the effect of solution chemistry on the fate and transport of nAg in
groundwater systems. The effects of pH, ionic strength and dissolved oxygen (DO) on nAg
transport, retention and dissolution ... read morekinetics in water-saturated sands were evaluated
through a series of batch, one-dimensional column and two-dimensional aquifer cell
studies. The mobility and dissolution of nAg in sand columns were found to be a strong
function of solution chemistry; deposition increased with decreasing pH, increasing
ionic strength and increasing DO. In batch and column studies, dissolution was enhanced
at lower pH values and higher DO concentrations. Results from column and aquifer cell
studies indicate that nAg retained in porous media can serve as long term sources of
silver ion.
Thesis (M.S.)--Tufts University,
2012.
Submitted to the Dept. of Civil
Engineering.
Advisor: Kurt
Pennell.
Committee: Linda Abriola, and Yusong
Li.
Keyword: Environmental
engineering.read less
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