Competitive Sorption and Transport - Transport and Fate of Chemicals in Soils: Principles and Applications - page 251

solution (1.8 pore volumes) for both Zn and Ag. In Figure 7.47, significant
difference in the arrival time of Ag in the presence and absence of Zn is
illustrated. Moreover, the presence of Zn resulted in a slight increase of Ag
sorption with an influent recovery of 35% compared to 38% in the absence
of Zn.
The solid and dashed curves shown in Figures 7.45 to 7.47 are multireaction
model simulations of Ag and Zn in the Windsor soil columns. Good model
predictions for both Ag and Zn were obtained as depicted by the prediction
of the effluent front, peak concentration maxima, and the slow release during
leaching. However, when a linear model was used, predictions were con-
sidered less than adequate. In addition, a decrease in effluent concentration
due to flow interruptions was observed in all BTCs. These are consistent for
both Ag and Zn and show the kinetic nature of their retention mechanisms,
which were well predicted by the multireaction models.
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