ENVS 2060 Lecture Notes - Lecture 17: Cation-Exchange Capacity, Vermiculite, Illite
31 Mar 2016
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Document Summary
These two groups interact where apical oxygens replace an oh group: shared b/w silica and 2 aluminums. Chlorite (2:1:1 clay) added octahedral unit in the middle held by hydrogen bonding, causes units to be stacked with hydrogen bonding and disallows anything to move in and out of interlayers (small sa) Middle block represents the negative charge associated with either clay or om. Called the cation capacity of the soil which is the ability of the soil to hold onto cations in the soil or water. Something new comes in, something else comes out can"t have more than the negative charge of the soil. Equilibrium is maintained to ensure the nutrients are not travelled down the proile, the plant can still intake it, even when it is depleted in the solution. No water between layers little s/w potential. As soil weathers, it changes the type of clay transfers.
