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Environmental fate & pathways

Phototransformation in air

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Description of key information

Degradation rate constants and half-lifes have been calculated with AOP for various alkyl-1,3-diaminopropanes. The averaged  values calculated for the octadecyl and tetradecyl-1,3-diaminopropanes have been used as key value.  

Key value for chemical safety assessment

Half-life in air:
2.8 h
Degradation rate constant with OH radicals:
0 cm³ molecule-1 s-1

Additional information

In the atmosphere alkyl-1,3-diaminopropanes are likely to be degraded by reaction with hydroxyl radicals. Degradation rates for some components were calculated with the Atmospheric Oxidation Programme based on structure activity relationships developed by Atkinson (1987). With a concentration of 500,000 OH-radicals/cm3, degradation half-lives of 2.9 h for tetradecyl-1,3-diaminopropane, 2.8 h for octadecyl-1,3-diaminopropane, and 2.0 and 1.9 h for the cis- and trans-isomer of oleyl-1,3-diaminopropane, respectively, were calculated. For the exposure calculations, a mean value for the saturated amines of 2.8 h is used. Because there are no important releases into the atmosphere and volatilisation is expected to be negligible, this removal mechanism is thought to be of low relevance.

Direct photolysis of alkyl-1,3-diaminopropanes in air will not occur, because it does not absorb UV radiation above 290 nm .Photo transformation in air is therefore assumed to be negligible.