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Description of key information

Degradation by photolytic processes can be excluded.

Key value for chemical safety assessment

Additional information

No data are available concerning any photoreaction leading to the degradation of ammonium bicarbonate. However it volatilizes into the air as NH3, CO2 and H2O where NH3 may undergo a variety of reactions. Photolytic reactions destroy some of the ammonia and reactions with sulphur dioxide or ozone produce aerosols, which return to the earth’s surface as wet or dry deposition (EHC, 1986). Atmospheric concentrations of ammonia vary according to underlying land usage. Urban concentrations are typically in the range of 5 – 25 μg/m3 and rural concentrations, 2 – 6 μg/m3. In most situations, atmospheric particulate ammonium concentrations are comparable to gaseous ammonia concentrations (EHC, 1986).


OECD (2006). SIDS Ammonium bicarbonate CAS: 1066-33-7, Draft 2006

WHO (1986). EHC 54, Ammonia