Topic 5 A) The Colloidal Fraction Flashcards
1
Q
Types of Soil Colloids
A
Crystalline Silicate clays
Non-crystalline silicate clays
Iron and aluminium oxides
Organic humus
2
Q
Isomorphous substituation in tetrahedral sheets
A
No change in structure but just a negative charge develops
3
Q
Structural componets of phyllosicilicate clay
A
2 x Al
6 x O-2
4
Q
Kaolineite
A
most common 1:1 clay
Impacted by pH
H-bonding between layers
5
Q
Smectite
A
2:1 Silicate clay
High Cation adsorption capacity
shrinking and swelling
6
Q
Verimculite
A
Lots of aluminum subsition
Strongly adsorbed water between layer (limited expansion)
