Introduction to Soil Chemistry

H
O
H
H
O
C
Na +– O
O
H H
O
H H
O
H H
H
O
H
O
O H
coated surfaces 41
O
C
O– Na +
O H H
C
O – Na + C O
O
– Na +
H
O
H H
H H
O
O
H H
O
H H
H H
O
H H O
O
H H
O
O
H H
O
H H
H H
O
C O – Na +
O H
H
O H
H
gen bonding and ion–charge interactions to form small conglomerations of
clay particles that will act like micelles also as shown in Figure 2.6 [16].
2.10. COATED SURFACES
O
C
O – Na +
O
H
O
H
H H
The discussion to this point assumes that all the surfaces of all the components
in soil are clean and available for reaction. This never happens. All surfaces
are covered by coatings of various types; the number, types, and amounts of
O
H
O
H H
H H
O
H H
O
H
O
H
O
H H
O
H H
Figure 2.6. An upper micelle of sodium octanoate in water lower micelle of 2 :1 clay (center gray
layer is an aluminum octrahedrial sheet; the upper and lower ones are silicon tetrahedrial sheets).