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Definition of Term

(English) Total ammonia is a general term referring to NH4+ and NH3 combined. In the older literature, the term "ammonia" has been used frequently by many authors, but is not recommended for future application without identification of its ionic speciation. Ammonium is a specific term for the ion NH?+, which is the ionized form of ammonia. Unionized ammonia or gaseous ammonia is a specific term for the dissolved gas NH3. Ammonium-Nitrogen is a specific term referring to the summed weight of nitrogen in the ionized NH4+-N. Total Ammonia-Nitrogen refers to both the molecular and ionized forms (NH3-N + NH4+-N) combined; values are reported as N. For ease of comparison, data should always be reported as "total ammonia-nitrogen" with the appropriate pH, temperature and salinity values provided.

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