Geoscience Reference
In-Depth Information
Fig. 12.20 Measured and simulated breakthrough curves (a and b) and retention profiles (c and
d) for representative nC
60
transport experiments at pore water velocities of 8 and 1 m/d in water-
saturated columns packed with four different size fractions of Ottawa sand. Aqueous nC
60
suspensions contained 1.0 mM CaCl
2
as a background electrolyte, buffered to pH 7 with 0.065 M
NaHCO
3
(Li et al.
2008
). Reprinted with permission from Li et al. (
2008
). Copyright 2008
American Chemical Society
leaching by solutions of various chemical compositions. Figure
12.23
shows the
SWNT breakthrough curves from elution with aqueous solutions of KCl with
various concentrations, followed by leaching with deionized water. Similar
breakthrough curves are shown in Fig.
12.24
for transport in the presence of
Suwannee River humic acid (SRHA). These results indicate that deposited SWNTs
are released from quartz sand upon introduction of low ionic strength monovalent
