Registration Dossier
Registration Dossier
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EC number: 212-855-9 | CAS number: 873-94-9
Endpoint summary
Administrative data
Description of key information
Additional information
According to a Mackay Level I model calculation the main target compartments for 3,3,5-trimethylcyclohexanone will be the hydrosphere (50.0 %) and the atmosphere (46.8 %), followed by sediment and soil (1.6 % each). The calculated Henry’s Law constant of 2.66 Pa m3/mol at 20 °C indicates moderate volatility of 3,3,5-trimethylcyclohexanone from surface waters. With a calculated Koc of 58.32 l/kg, the sorption potential of 3,3,5-trimethylcyclohexanone to soil or sediment organic matter is expected to be very low (Blume scale).
The QSAR calculated rate constant for the OH sensitized photodegradation of 3,3,5-trimethylcyclohexanone is approximately 1.29E-11 cm3 /(molecule * s). At 500,000 OH radicals / cm3 (approximate 24-hour mean in central Europe), this corresponds to a half-life of 29.7 hours. 3,3,5-Trimethylcyclohexanone was found not readily biodegradable but significant biodegradation was observed. Biodegradation and atmospheric OH sensitized photodegradation are expected to be the predominant ways of removal from the environment while photolytical or hydrolytical degradation in surface water are expected to be of minor importance. The partition coefficient 1-octanol/water of 3,3,5-trimethylcyclohexanone is log Kow = 2.6 at 25 °C, indicating insignificant potential for bioaccumulation.
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