Registration Dossier
Registration Dossier
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EC number: 269-110-6 | CAS number: 68187-58-6 The residue from the distillation of thermal cracked or steam-cracked residuum and/or catalytic cracked clarified oil with a softening point from 40°C to 180°C (104°F to 356°F). Composed primarily of a complex combination of three or more membered condensed ring aromatic hydrocarbons.
Partition coefficient
Administrative data
Link to relevant study record(s)
Description of key information
A chemical analytical study (OECD 117) with pitch, petroleum, arom. [CAS No. 68187-58-6] confirms the result from a previous literature search: Relevant log Pow values range from 4.4 - 6.5, based on HPLC analysis.
Key value for chemical safety assessment
- Log Kow (Log Pow):
- 6.13
- at the temperature of:
- 20 °C
Additional information
In a standard study using the HPLC method (OECD 117), pitch, petroleum, arom. [CAS No. 68187-58-6] was practically insoluble in the common solvent mixture (methanol/water, here: 75+25) and had to be dissolved in tetrahydrofuran (THF) before analysis.
Eight peaks with relative areas >5 % were used for evaluation. They contributed 71.1 % of the total HPLC area under test conditions. The log Pow of the test substance is therefore stated as range of 4.43 - 6.47.
Note: The test substance analysis by GC shows that only a minor part of the test substance is accessible to GC, less than 5 % of the injected amount, the key constituents only representing 0.1 – 0.4 % of the sample. The same applies to HPLC.
The range of Pow values based on selected key components and published log Pow is confirmed by this analytical exercise.
The given maximum log Pow value, an average of published value, relates to benzo[a]pyrene, the marker substance (taken from EU 2008, Tab. 1.6), is continued to be used for risk assessment .
References:
EU (2008). Coal-Tar Pitch, high temperature - Risk Assessment. European Union Risk Assessment Report, The Netherlands [http://ecb.jrc.ec.europa.eu/esis/]
According to EU 2008, presented data from:
Mackay D, Shiu WY, Ma KC (1992). lllustrated Handbook of Physical-Chemical Properties and Environmental Fate of Organic Chemicals.Lewis Publishers, Boca Raton, FL.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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