Ammonia

CAS RN: 7664-41-7

Soil Adsorption / Mobility

Ammonia is strongly adsorbed on soil, and on sediment particles and colloids in water. This adsorption results in high concentrations of sorbed ammonia in oxidized sediments. Under anoxic conditions, the adsorptive capacity of sediments is less, resulting in the release of ammonia to either the water column or an oxidized sediment layer above.
In clay, the ammonia ion tends to be adsorbed on the negative adsorption sites of clay colloids. It may substitute for potassium in the lattice structure of a clay mineral.
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