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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Physical & Chemical properties

Partition coefficient

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Administrative data

Link to relevant study record(s)

Description of key information

With regard to the experimental determined Log Pow range of 7.06 - 12.53 (Tait and Laud, 2000), a key value of 7.99 was considered as relevant. This key value is exactly below  the  trigger value (Log Pow = 8) for the exposure modelling  approach using CHESAR v2.3. Log Pow values equal to or above 8 cannot be considered due to exposure modelling limitations.

Key value for chemical safety assessment

Log Kow (Log Pow):
at the temperature of:
25 °C

Additional information

The key value of the C20-24 sodium sulfonate (Benzenesulfonic acid, mono-C20-24 (even)-sec-alkyl derivs., para-, sodium salts) was assessed based on the solubility in n-octanol and water. The partition coefficient was determined by the HPLC method according to OECD Guideline 117 (Tait and Laud, 2000). As a result of this study, a Log Pow range of 7.06 - 12 .53 was determined.