Cation-exchange Capacity - Standard Values

Standard Values

Kaolinite 3-15
Halloysite 2H2O 5-10
Halloysite 4H2O 40-50
Montmorillonite-group 70-100
Illite 10-40
Vermiculite 100-150
Chlorite 10-40
Glauconite 11-20+
Palygorskite-group 20-30
Allophane ~70

These are the values reported by Carroll (1959) for the cation-exchange capacity of minerals in meq./100g at pH of 7.

Read more about this topic:  Cation-exchange Capacity

Famous quotes containing the words standard and/or values:

    Error is a supposition that pleasure and pain, that intelligence, substance, life, are existent in matter. Error is neither Mind nor one of Mind’s faculties. Error is the contradiction of Truth. Error is a belief without understanding. Error is unreal because untrue. It is that which seemeth to be and is not. If error were true, its truth would be error, and we should have a self-evident absurdity—namely, erroneous truth. Thus we should continue to lose the standard of Truth.
    Mary Baker Eddy (1821–1910)

    Parents ought, through their own behavior and the values by which they live, to provide direction for their children. But they need to rid themselves of the idea that there are surefire methods which, when well applied, will produce certain predictable results. Whatever we do with and for our children ought to flow from our understanding of and our feelings for the particular situation and the relation we wish to exist between us and our child.
    Bruno Bettelheim (20th century)