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Environmental fate & pathways

Adsorption / desorption

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Description of key information

No Koc value derivable for coal-tar pitch due to practical insolubility in water and complexity of its composition. Benzo[a)]yrene serves as marker substance.

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 logPow 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) (see entry no. 3).

[LogKoc: 5.92]