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Partition coefficient

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partition coefficient
Type of information:
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification
Justification for type of information:
Please refer to attached QMRF/QPRF documents.
according to
other: REACH guidance on QSAR R.6
Principles of method if other than guideline:
Estimates the log octanol-water partition coefficient, log KOW, of chemicals using an atom/fragment contribution method.
GLP compliance:
Type of method:
calculation method (fragments)
Partition coefficient type:
Specific details on test material used for the study:
Key result
log Pow
Partition coefficient:
25 °C
Remarks on result:
other: QSAR predicted value. The substance is within the applicability domain of the model.
Using KOWWIN v1.68 the logPow of the test item was calculated to be 0.85 at 25 °C. The substance is within the applicability domain of the model.
Executive summary:

The logPow was calculated using KOWWIN v1.68 as part of EPISuite v4.11 from US Environmental Protection Agency.

Using KOWWIN v1.68 the log Kow of the test item was calculated to be 0.85 at 25 °C (EPI Suite, 2014).

The adequacy of a prediction depends on the following conditions:

a) the (Q)SAR model is scientifically valid: the scientific validity is established according to the OECD principles for (Q)SAR validation;

b) the (Q)SAR model isapplicable to thequery chemical: a (Q)SAR is applicable if the query chemical falls within the defined applicability domain of the model;

c) the (Q)SAR result is reliable: a valid (Q)SAR that is applied to a chemical falling within its applicability domain provides a reliable result;

d) the (Q)SAR model isrelevant for theregulatory purpose.


For assessment and justification of these 4 requirements the QMRF and QPRF files were developed and attached to this study record.


Description of the prediction Model

The prediction model was descripted using the harmonised template for summarising and reporting key information on (Q)SAR models. For more details please refer to the attached QSAR Model Reporting Format (QMRF) file. 


Assessment of estimation domain

The assessment of the estimation domain was documented in the QSAR Prediction Reporting Format file (QPRF). Please refer to the attached document for the details of the prediction and the assessment of the estimation domain.

Description of key information

The log Pow of crotonic acid is 0.71 - 0.85 at 25 °C

Key value for chemical safety assessment

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

Additional information

It was found that the log Pow of crotonic acid is 0.71 - 0.85 at 25 °C. For chemical safety assessment the upper end of this range has been chosen.