Agriculture Reference
In-Depth Information
2000
Houston
1600
Onley
Morey
1200
Sharkey
800
400
Zn - Isotherms
0
0
10
20
30
40
Zn Concentration (mg/L)
1000
Arapahoe
800
Lincoln
Crowley
600
Nada
400
200
Zn - isotherms
0
0
20
40
60
80
100
Zn Concentration (mg/L)
FIGURE 1.12
Zinc isotherms for several soils after one day of reaction. Solid and dashed curves are simula-
tions using the Freundlich model.
The detection limit for lead using inductively coupled plasma-atomic emis-
sion spectrometry (ICP-AES) was 28 μg/L (ppb). The other soils exhibited
different degrees of affinity for lead, as illustrated in Figures 1.16 and 1.17.
Soils with high organic matter content such as Arapahoe as well as soils with
high clay contents such as Sharkey exhibited high sorption. It should also be
emphasized that Olney soil with high pH and carbonate content exhibited
high sorption for lead. Parameter values for
K
d
of the linear model and
K
f
and
b
for the Freundlich models along with their
r
2
are given in Table 1.7.
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