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Physical & Chemical properties

Partition coefficient

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Description of key information

Standard partition coefficient studies are not appropriate for petroleum UVCB substances. In accordance with Annex XI Section 1.3 testing is not scientifically necessary and the endpoint has been fulfilled using

QSAR calculations for relevant constituents. Full justifications for this QSAR are presented in 'Attached justification', but in brief these are justified because:

- the results are obtained from a QSAR model whose scientific validity has been established

- petroleum substances fall within the applicability domain of the QSAR model

- results are adequate for the purposes of risk assessment

- adequate and reliable documentation is provided

Key value for chemical safety assessment

Additional information

The substance is a hydrocarbon UVCB. Standard partition coefficient studies for this endpoint are intended for monoconstituent substances and are not appropriate for this complex substance. However,

this endpoint is characterised using quantitative structure property relationships for representative hydrocarbon structures that comprise the hydrocarbon blocks used to assess the environmental risk of this substance with the PETRORISK model (see Product Library in PETRORISK spreadsheet attached in section 13).