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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Physical & Chemical properties

Partition coefficient

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Description of key information

A range of 2.05 to 13.25 for the log Kow was obtained using the EPISuite modelling tool. A literature reference reported a value of >5 (NIOSH, 2007)

Key value for chemical safety assessment

Log Kow (Log Pow):

Additional information

Because naphthenic acids are mixtures of many different isomers of cycloalkyl carboxylic acids, physicochemical properties vary according to the proportions of the individual compounds in their composition. Therefore it is not possible to set a specific value for partition coefficient. To gain an understanding of partition coefficient characteristics of naphthenic acids, various hydrocarbon acidic structures which are shown to predominate in naphthenic acids were estimated for partition coefficient using the EPISuite computer model (US EPA, 2009). A range of values between 2.05 and 13.25 are reported. These results are supported by data found in secondary literature.

Value used for CSA: >5