Registration Dossier
Registration Dossier
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EC number: 215-676-4 | CAS number: 1341-49-7
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Ammonia is strongly adsorbed on soil, sediment particles and colloids in water. Ammonia is strongly adsorbed on soil, sediment particles and colloids in water.
Key value for chemical safety assessment
Additional information
Ammonia is strongly adsorbed on soil, sediment particles and colloids in water. In clay, ammonium tends to be absorbed on the negative adsorption sites of clay colloids. Ammonia may substitute for potassium in the lattice structure of a clay mineral. Ammonia is bound in soil by the attraction of the positive charge on the ammonium ion to the negatively charged soil micelles. In soil, ammonium is adsorbed primarily by four mechanisms: chemical (exchangeable), fixation (non-exchangeable), reaction with organic matter and physical attractive forces. The behaviour of fluoride in water is dependent on pH and mineral content. Fluoride is deposited to sediment as insoluble complexes and is essentially immobile in soil due to its incorporation into insoluble complexes.
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