Selected Research Findings: Contaminant Transport - Contaminant Geochemistry - page 310

Fig. 12.27 Breakthrough curves for AgNPs in soil (Darcy velocity 0.66 cm/min) with and
without the presence of humic acid in solution (Sagee et al. 2012 ). Reprinted from Sagee et al.
( 2012 ). Copyright 2012 with permission from Elsevier
Fig. 12.28 Breakthrough curves for AgNPs in soil (Darcy velocity 0.17 cm/min) in columns
pre-treated with potassium nitrate to remove soil residual chlorine, and a control column (Sagee
et al. 2012 ). Reprinted from Sagee et al. ( 2012 ). Copyright 2012 with permission from Elsevier
and reduce their interactions (and thus retention) in the soil column. On the
assumption that residual chlorides in the soil are the major components involved in
the interaction with the nanoparticles, Sagee et al. ( 2012 ) tested the effect of
washing the soil with nitrate solution (Fig. 12.28 ); nitrates were added in excess to
the soil to replace all chloride residuals. The concentration of eluted AgNP
increased dramatically in all cases, indicating that the chemical composition of the