Environmental Engineering Reference
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Chemical analysis of the samples for pH, EC, water soluble sulphate and
concentrated HCl extractable barium showed that all of these parameters possessed
a depth function (Fig.
2.15
). That pH, EC, and percent exchangeable Na display
a depth function in these clay soils was known a long time. A zone of calcium
pH
Ba (ppm in HCl)
0
5
10
1
5
0
50
100
150
20
0
0 to 10
0 to 10
10 to 20
10 to 20
20 to 30
20 to 30
30 to 40
30 to 40
40 to 50
40 to 50
50 to 60
50 to 60
60 to 70
60 to 70
70 to 80
70 to 80
80 to 90
80 to 90
90 to 100
90 to 100
EC (microS/cm)
Soluble sulphate (ppm)
0
1000
2000
3000
40
0
0
0 to 10
10 to 20
20 to 30
30 to 40
40 to 50
50 to 60
60 to 70
70 to 80
80 to 90
90 to 100
Fig. 2.15
Depth functions of some soil chemical parameters in basalt-derived heavy clay soils
(Wrigley et al.
2006
)
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