ammonium

matter

Definition: The ammonium cation is a positively charged polyatomic ion with the chemical formula NH+4 or [NH4]+. It is formed by the protonation of ammonia (NH3). Ammonium is also a general name for positively charged (protonated) substituted amines and quaternary ammonium cations ([NR4]+), where one or more hydrogen atoms are replaced by organic or other groups (indicated by R).

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Occurs in:

• atmosphere_air-column_aerosol~dry_ammonium__mass-per-area_density
• soil_ammonium-as-nitrogen~elemental__dry_mass_fraction
• ammonium-as-nitrogen__average_of_mass_leaching_rate
• soil_profile_bottom_water_ammonium__time_integral_of_drainage_leaching_mass_flux
• soil_profile_ammonium-as-nitrogen__mass-per-area_density