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Ammonia as Nitrogen. ALS Environmental may or may not test for Ammonia as Nitrogen (CAS # 7664-41-7). Information is subject to change; please contact us for the latest available analytes for which we test.
In attempting to understand the rationale used to measure ammonia, it is important to review some of the physical properties of the compound. Ammonia (NH3) is a colorless, acrid-smelling gas at room temperature and pressure. It easily dissolves in water and ionizes to form NH4+ as follows: NH3 + H2O ââ NH4++ OH-.