Geoscience Reference
In-Depth Information
Table 12.2
Physicochemical and mineralogical properties of soils and colloids (Karathanasis
1999
)
Properties
Soils
Colloids
Loradale
Maury
Beasley
Loradale
Maury
Shrouts
Smithdale
Waynesboro
Clay (%)
21
35
-
-
-
-
-
-
Hydraulic conductivity (cm/min)
0.3 ± 0.2
2.6 ± 1.7
-
-
-
-
-
-
Bulk density (g/cm
3
)
1.4
1.6
-
-
-
-
-
-
Mean colloid diameter (nm)
-
-
220
300
700
270
400
1,050
Organic C (%)
2.1
0.5
0.8
3.4
0.8
0.8
0.5
0.4
pH
6.3
5.8
6.2
6.7
6.3
5.8
5.9
5.2
CEC (cmol/kg)
a
25.2
21.9
63.4
81.8
47.5
46.4
37.2
29.0
Extractable bases (cmol/kg)
15.0
10.1
26.5
29.2
20.6
17.3
18.4
8.1
Extractable Fe (mg/g)
6.5
8.3
15.9
15.9
16.2
16.4
67.9
75.7
Extractable Al (mg/g)
4.4
2.8
6.1
5.2
10.9
9.2
57.1
61.3
Surface area (m
2
/g)
-
-
386
186
190
123
121
114
Electrophoretic mobility (cm/v/s)
-
-
-1.8
-1.9
-1.4
-1.6
-0.7
-0.8
Smectite ? vermiculite (%)
-
-
60
-
-
17
-
-
HISM + HIV (%)
b
-
-
-
44
46
-
29
21
Mica (%)
-
-
20
15
10
60
7
11
Kaolinite (%)
-
-
16
35
36
20
58
56
Quartz (%)
-
-
4
6
8
3
6
12
a
CEC cation-exchange capacity
b
HISM hydroxyinterlayered smectite; HIV hydroxyinterlayered vermiculite; mean colloid diameter is expressed on a mass basis as measured by a
microscan particle-size analyzer
