Agriculture Reference
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Or more explicitly we have
m
θ
ρ
∑
l
[]
n
S
=
f
[]
K
C
l
(9.21)
e
l
el
l
l
=
1
Similarly, the amount of solute adsorbed by the kinetic sites of the mixed
soil is:
m
∑
S
=
f
[]
S
(9.22)
k
l
kl
l
=
1
where
m
∂
[]
S
t
θ
ρ
∑
kr
l
[]
n
=
fk
[]
Ck
−
([
][])[]
+
kS
l
(9.23)
l
1
l
2
l
3
l
kl
∂
l
l
=
1
In addition, the corresponding irreversible reactions are:
m
∂
S
t
∑
irr
=
fk
[][]
3
S
(9.24)
l
l
kl
∂
l
=
1
The above formulation was incorporated into the convective-dispersive
equation (CDE) and solved subject to the following initial and boundary
(third-type) conditions:
C
= 0
t
= 0 0 <
x
<
L
(9.25)
SSS
== =
0
t
= <<
0
0
xL
(9.26)
e
k
irr
CD
C
x
∂
∂
ν=−
+ν
Cx
=
0
tt
≤
(9.27)
o
p
∂
∂
C
x
0
=−
D
+ν
Cx
=
0
t
p
>
(9.28)
∂
∂
C
x
=
0
xLt
=
>
0
(9.29)
where
t
p
is the duration of the applied atrazine pulse (hour),
L
is the column length
(cm),
C
o
is atrazine concentration in the applied pulse (μg/mL). The CDE can be
solved numerically using the implicit-explicit finite-difference approximation.
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