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20
Ni predictions
15
Model 1
Model 2
1:1 Line
10
5
0
0
1
2
3
4
5
Measured log
K
d
FIGURE 1.21
Measured and calculated
K
d
values for Ni for all soils. Calculated values for
K
d
were obtained
using models 1 and 2 of Sauvé, Hendershot, and Allen (2000).
For all 10 soils used in this study, the Sauvé, Hendershot, and Allen (2000)
models based on soil pH or soil pH and organic carbon provided less than
adequate predictions for
K
d
values for all five heavy metals. In contrast, good
predictions were obtained for the Freundlich parameter
b
when the Buchter
et al. (1989) model was used.
10
Pb Predictions
8
6
4
Model 1
Model 2
1:1 Line
2
0
0
2
4
6
8
10
Measured log Kd
FIGURE 1.22
Measured and calculated
K
d
values for Pb for all soils. Calculated values for
K
d
were obtained
using models 1 and 2 of Sauvé, Hendershot, and Allen (2000).
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