Agriculture Reference
In-Depth Information
500
Adsorption Isotherms
Sugarcane Mulch Residue
400
300
2 h
8 h
24 h
192 h
504 h
Pred
200
100
0
0
10
20
30
Atrazine in Solution (μg mL
-1
)
FIGURE 2.9
Time-dependent adsorption isotherms of atrazine by sugarcane mulch residue.
curves represent successive desorption isotherms. These isotherms clearly
illustrate the kinetic behavior of solute sorption and that short-term iso-
therms (hours or days) do not necessarily provide an accurate description
of their affinity to a specific type of matrix surface or a given soil. Details
regarding kinetic measurements of adsorption and desorption are discussed
later in this chapter (also see Selim and Zhu, 2005).
400
(b) Desorption Time-Dependent
Isotherms - Freundlich
300
200
Adsorption
1d
2d
3d
4d
5d
6d
Pred
100
0
0
5
10
15
20
Atrazine in Solution (µg mL
-1
)
FIGURE 2.10
Time-dependent desorption isotherms of atrazine by sugarcane mulch residue. The solid line
is the adsorption isotherm for 504 hours of reaction. Dashed curves are desorption isotherms.
Search WWH ::
Custom Search