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Adsorption / desorption

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Description of key information

No Koc value is derivable for Pitch, coal tar, high-temp., < 1% 4- to 5-membered condensed ring aromatic hydrocarbons [EC no. 701-305-8] (CTPhtht] due to practical insolubility in water and complexity of its composition. Benzo[a]pyrene (BaP) serves as marker substance; thus, the given Koc relates to BaP.

Key value for chemical safety assessment

Koc at 20 °C:
832 000

Additional information

The given values relate to the marker substance, benzo[a]pyrene: The Koc has been estimated from the mean log Pow of 6.13 for BaP according to EU 2008 (Risk assessment of coal-tar pitch): Koc values estimated using the experimental equation derived by Karickhoff et al. (1979): Koc = 0.63 Kow (or log Koc = 1.00 log Kow – 0.21) ==> logKow = 6.13 --> LogKoc: 5.92.