Registration Dossier
Registration Dossier
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EC number: 696-616-8 | CAS number: 1268344-02-0
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
Degradation rate constants and half-lifes have been calculated with AOP for various ethoxylated alkyl-1,3-diaminopropanes. The value as calculated for the ethoxylated octadecyl-1,3-diaminopropanes has been used as key value as a realistic worst-case.
Key value for chemical safety assessment
- Half-life in air:
- 2.3 h
- Degradation rate constant with OH radicals:
- 166.511 cm³ molecule-1 s-1
Additional information
In the atmosphere ethoxylated 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 1.75 h for the cis isomer of amines, N-(C18 unsaturated, alkyl) trimethylenedi-, ethoxylated (NLP) and 2.3 h for ethoxylated octadecyl-1,3-diaminopropane (overall OH rate constant: 166.511e-12 cm3/molucule sec). For the exposure calculations, a realistic worst-case value for the saturated amines of 2.3 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 ethoxylated 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.
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