Registration Dossier
Registration Dossier
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EC number: 231-635-3 | CAS number: 7664-41-7
Endpoint summary
Administrative data
Description of key information
Additional information
Anhydrous Ammonia entering the soil at low concentrations and not by point sources is converted to other forms by bacteria in the nitrate cycle. Exposure of terrestrial arthropods is therefore not predicted.
Ammonia is used as a component of fertilisers for application to many species of terrestrial plants, therefore toxicity to terrestrial plants is not predicted at relevant levels of exposure.
In soil, ammonia is readily converted by a variety of bacteria, actinomycetes and fungi to ammonium (NH4+) by the process of ammonification or mineralization. Hence, it can be assumed that ammonia entering the soil at low concentrations as non-point sources is also converted to nitrate. Nitrate is subsequently taken up and utilised by plants or returned to the atmosphere following denitrification; the metabolic reduction of nitrate into nitrogen or nitrous oxide (N2O) gas. The most likely fate of ammonium ions in soils is conversion to nitrates by nitrification.
A waiver is proposed for toxicity to birds, since ammonia is not bioaccumulating.
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