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EC number: 206-420-2 | CAS number: 338-83-0
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
Perfluorotripropyl amines (CAS# 338-83-0) has an estimated atmospheric lifetime >2000 years by direct photolysis.
Key value for chemical safety assessment
Additional information
Perfluorotripropyl amines (PTPA) is expected to reside in the atmosphere. Given its uses, any releases will be solely to the atmospheric compartment. No releases to aquatic or terrestrial compartments are expected. Due to its vapor pressure and water solubility, this substance will not partition from the atmosphere to other compartments. Therefore, phototransformation processes will control its fate. The phototransformation of PTPA was addressed by readacross from the structural analog perfluorotriethylamine (PTEA). No phototransformation due to indirect photolysis by hydroxyl radical, nor due to direct photolysis, could be detected. Perfluorotriethylamine (PTEA) is a close structural analog of perfluorotripropylamine (PTPA), differing only in the absence of one difluoromethylenyl group in each perfluoroalkyl side chain. The reactivity of these perfluoroamines toward hydroxyl radical-induced photodegradation is expected to be very similar, in that perfluoroalkyl side chains are known to be resistant to hydroxyl radical. Perfluorotributylamine (PTBA), another member of the perfluorinated organic chemicals, C5-C18 category, is similarly resistant to hydroxyl radical. However, PTBA has a measurable UV absorbance at wavelengths < 190 nm. By extension from perfluoroalkanes, the atmospheric lifetime of PTEA is expected to be >2000 years.
Absent UV absorption spectra for PTPA, and given lack of direct phototransformation for PTEA, it is assumed that no UV absorbance in the range relevant for the lower atmosphere occurs for PTPA, and that atmospheric lifetime is also >2000 years.
No stable degradation products are expected once photoinitiation occurs (1). Ultimate degradation products are CO2, HF and NOx compounds.
1) C.J. Young, M.D. Hurley, T.J. Wallington, S. A. Mabury, 2006. Atmospheric lifetime and Global Warming Potential of a perfluoropolyether. Environ. Sci. Technol. Vol 40, pp. 2242-2246.
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