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1.0
A
0.8
B
C
0.6
D
0.4
0.2
0
0
2
4
6
8
10
12
14
16
V/V
o
FIGURE 8.15
Effluent concentration distributions for Cr in Windsor soil. Curves A, B, C, and D are predic-
tions using the second-order mobile-immobile model with batch rate coefficients for
C
/
C
o
of
25, 5, 2, and 1 mg/L, respectively. (From H. M. Selim and M. C. Amacher. 1997.
Reactivity and
Transport of Heavy Metals in Soils
. Boca Raton, FL: CRC Press. With permission.)
standard errors and were often physically unrealistic (e.g., a retardation factor
R
>> 1). Perhaps these results are due to local equilibrium conditions between
the mobile and immobile regions for the two tracers (Rubin, 1983; Parker and
Valocchi, 1986).
Values for the rate coefficients used in the second-order mobile-immobile
model were those calculated from batch kinetic results. Selim and Amacher
1.0
0.8
A
0.6
B
0.4
0.2
C
0
0
4 826048 2
V/V
o
FIGURE 8.16
Effluent concentration distributions for Cr in Cecil soil. Curves A, B, and C are predictions
using the second-order mobile-immobile model with batch rate coefficients for
C
/
C
o
of 25, 10,
and 5 mg/L, respectively. (From H. M. Selim and M. C. Amacher. 1997.
Reactivity and Transport
of Heavy Metals in Soils
. Boca Raton, FL: CRC Press. With permission.)
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