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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Calculation of the log Koc to determine the potential for adsorption/desorption of chemicals is acceptable provided that a recognised and scientifically robust method is used. The TGD includes a method for calculating a log Koc using the log Kow. As a Log Kow was not available for Hydrocarbons, C5, n-alkanes, isoalkanes it was deemed suitable to use data from n-pentane to read-across as the substances have a similar structure and so are predicted to have a similar behaviour in the environment. The log Kow of n-pentane is 3.54. The Koc was calculated to be 794.3 (log Koc = 2.9) using TGD calculation of Koc = 0.81 x Log Kow + 0.1. This value was also used in the EU RAR for n-pentane and so is considered suitable as key study for this endpoint. The Koc of cyclopentane was calculated as 339 using the same equation and the Log Kow of 3. These values indicate that although the adsorption of the pentane substance to soil will be moderate they still have good mobility in the environment.