Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

According to a Mackay level I calculation cis-cyclooctene will be distributed almost exclusively to the atmosphere (99.86 %) while distribution to other compartments is negligible (< 0.1 % each). The calculated Henry’s law constant of 36,400 Pa m3/mol at 20 °C indicates high volatility of cis-cyclooctene from surface waters. The adsorption coefficient on soil Koc of cis-cyclooctene was determined as 1000 (log Koc = 3.0; 25 ºC). This is borderline between moderate and high on the Blume scale.


The QSAR calculated rate constant for the OH sensitized photodegradation of cis-cyclooctene is approximately 6.43E-11 cm3/(molecule * s). At 500,000 OH radicals / cm3 (approximate 24-hour mean in central Europe), this corresponds to a half-life of 6 hours. The reaction with ozone is slightly faster and thereby reduces the atmospheric half-life of cis-cyclooctene by a factor of about 2. Although not readily biodegradable according to the guideline requirements, cis-cyclooctene can be metabolized by microorganism. Atmospheric OH and ozone sensitized photodegradation plus biodegradation 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 cis-cyclooctene was determined as log Kow 5.0 at 25 °C, indicating a potential for bioaccumulation.