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Partition coefficient

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Description of key information

A chemical analytical study (OECD 117) with Anthracene Oil < 50 ppm B[a]P [CAS No. 90640 -80 -5] confirms the result from a previous literature search: Relevant log Pow values range from 4.4 - 5.2, based on HPLC analysis. 

Key value for chemical safety assessment

Log Kow (Log Pow):
4.57
at the temperature of:
20 °C

Additional information

In a standard study using the HPLC method (OECD 117), Anthracene Oil < 50 ppm B[a]P [CAS No. 90640 -80 -5] was poorly soluble in the common solvent mixture (methanol/water, here: 75+25) and had to be dissolved in tetrahydrofuran (THF) before analysis.

Five peaks with relative areas > 5 % were used for evaluation. They contribute 77.8 % of the total HPLC area under test conditions.

The log Pow of the test substance is therefore stated as range of 4.43 - 5.2.

Based on their retention times, peaks 5, 10, 14, and 20 were allocated to the substances naphthalene, phenanthrene, fluoranthene, and chrysene.

Note: The GC analysis shows that two of the key constituents (phenanthrene and fluoranthene) account for about 32 %, while the total of relevant key components amounts to about 45 – 50 % of the injected sample. The composition confirms the dominant constituents from fluorene to fluoranthene/pyrene cover this Pow range.

The range of Pow values based on selected key components and published log Pow is confirmed by this analytical exercise.

The given log Pow value (4.57) related to phenanthrene, the marker substance (taken from WHO 1998), is considered to sufficiently represent the mean partition properties of this UVCB substance and is continued to be used for risk assessment.