Agriculture Reference
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Equilibrium
100 days
100
20
80
10
60
4
40
k
1
= 0.0001 day
-1
k
2
= 0.001
S
max
= 100 mg kg
-1
20
0
0
20
40
60
80
100
120
140
160
c
, mgL
-1
FIGURE 6.2
Effect of time of retention on sorption isotherms using the second-order kinetic model. (From
H. M. Selim and M. C. Amacher. 1997.
Reactivity and Transport of Heavy Metals in Soils
. Boca
Raton, FL: CRC Press. With permission.)
200
S
max
= 200 mg kg
-1
160
120
S
max
= 100
80
S
max
= 50
40
k
1
= 0.001 day
-1
k
2
= 0.01
Time = 10 days
0
0
20
40
60
80
100
c
, mg L
-1
FIGURE 6.3
Effect of total number of sites (S
max
) on the shape of sorption isotherms using the second-order
kinetic model. (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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