Agriculture Reference
In-Depth Information
100
Cu Adsorption - McLaren Soil
Multireaction Model version I
80
C
o
= 100 mg/L
60
40
50
20
10
20
10
0
0
25 0 5 00
125 50
175 00
Time, Hours
FIGURE 5.5
Experimental adsorption results of Cu from soil solution in McLaren soil versus time for sev-
eral initial concentrations (
C
o
). The solid curves were obtained using the multireaction model
with
S
1
and
S
irr
. Estimated model parameters along with their standard errors (
k
1
,
k
2
, and
k
3
)
are given in Table 5.1.
Figure 5.5 shows experimental adsorption results of Cu in soil solution
in McLaren soil versus time for several initial concentrations (
C
o
). The solid
curves were obtained using the multireaction model shown in Figure 5.4 (see
Selim and Ma, 2001). The use of this model was limited to two sorbed phases,
one reversible (
S
1
) and the other irreversible (
S
irr
). This was carried out by
setting up all parameters associated with the remaining phases as zero.
Estimated model parameters along with their standard errors (
k
1
,
k
2
, and
k
irr
)
are given in Table 5.1. Here the estimated parameters were independently
obtained for each initial concentration (
C
o
) as well as for the entire data set
TABLE 5.1
Goodness of Fit of the Multireaction Model for Individual and Overall Initial
Concentrations (
C
o
)
C
o
(mg/L)
k
l
(h
-1
)
SE
(h
-1
)
K
2
(h
-1
)
SE
(h
-1
)
K
irr
(h
-1
)
S
E
(h
-1
)
r
2
RMSE
5
0.601
0.3601
0.682
0.225
0.429
0.167
0.0062
0.0022
10
0.849
0.3668
0.922
0.109
0.270
0.043
0.0079
0.0022
20
0.762
0.8887
1.133
0.179
0.315
0.063
0.0059
0.0018
50
0.802
2.1709
0.994
0.163
0.273
0.056
0.0028
0.0010
100
0.663
4.3336
1.217
0.252
0.357
0.087
0.0019
0.0007
Overall
0.992
2.0635
1.131
0.089
0.323
0.031
0.0020
0.0003
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