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Modeling the photolysis of ammonium dinitramide in natural waters

Photolytic rate constants for the novel energetic compoundammonium dinitramide(ADNweredetermined in order to understand the fate of ADN in natural bodies of water. Quantum yields were measured between 290 and 400 nm using a lamp system, and these values were combined with absorption of light in a water column to model photolysis rates as a function of depth. The validity of this model was tested in field trials in Onondaga Lake, Syracuse, New York, USA. For a summertime irradiation, half‐lives ranged from ∼6 min at the surface to —15 years at a depth of 2 m. The predicted and observed degradation rates of ADN were sufficiently similar to justify use of this simple model. It was also found that the degradation of ADN is not enhanced to any measurable degree by sensitized photoreactions in humic solutions. Thus, the photodegradation of ADN can be predicted throughout the water column of a body of water.