Registration Dossier
Registration Dossier
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EC number: 213-911-5 | CAS number: 1066-33-7
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Adsorption to solid soil phase is possible.
Key value for chemical safety assessment
Additional information
Due to the ionic nature of the substance the calculation of sorption onto organic soil matter does not have any practical meaning.
"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."
"Since ammonia is so poorly mobile in soil, it is unlikely to leach to groundwater except under unusual circumstances, such as when the cation exchange capacity of the soil is exceeded. The worst situation for ammonium leaching would probably occur when the soil is at field capacity with respect to water."
References:
Environment Canada (2001). Priority substances list assessment report. Ammonia in the environment. http://www.hc-sc.gc.ca/ewh-semt/pubs/contaminants/psl2-lsp2/ammonia/ammonia_2-eng.php
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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