Competitive Sorption and Transport - Transport and Fate of Chemicals in Soils: Principles and Applications - page 241

250

Cecil Soil

P not added

200

1 day

4

150

100

P = 100 mg/L

50

1 day
4

0

0 20 40 60 80

V Concentration (mg/L)

FIGURE 7.35
Vanadium isotherms after 1 and 4 d retention for Cecil soil. Isotherms are also presented in the
presence of 100 mg of P in the soil solution.

mixed solution (P plus V). The BTCs clearly indicate higher affinity for V
over P for all cases presented here. This was evident when three consecutive
pulses were introduced in the Cecil soil column, as illustrated in Figure 7.38.
For the case shown in Figure 7.37, both P and V peaks represent the input
pulse solution during all three pulses. Based on peak concentration and

400

Sharkey Soil

300

200

1d with P added
1d no P added
21d with P added
21d no P added
Freundlich isotherm

100

0

0 2 4 6 8

V Concentration (mg/L)

FIGURE 7.36
Vanadium isotherms after 1 and 21 d retention for Sharkey soil. Isotherms are also presented
in the presence of 100 mg of P in the soil solution.