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.
Bioaccumulation: terrestrial
Administrative data
Link to relevant study record(s)
Description of key information
Bioaccumulation is not applicable to pitch. Provisionally, a terrestrial BCF for benzo[a]pyrene is provided. Based on a log Pow of 6.13 (Pow = 1,350,000), the BCF for earthworm is estimated following the procedure described in the Technical Guidance Document (ECHA guidance on IR&CSA - Chapter R.16) (see above).
Key value for chemical safety assessment
- BCF (terrestrial species):
- 16 200 L/kg ww
Additional information
According to Guidance on IR&CSA - Chapter R.16: Environmental Exposure Estimation, R.16.6.7.2 (p. 91), bioconcentration in earthworm can be described for organic substances as a hydrophobic partitioning between the pore water and the phases inside the organism. This equilibrium partitioning approach can be modelled according to the following equation as described by Jager (1998):
BCFearthworm= (0.84 + 0.012Pow) / ROHearthworm
where for ROHearthwormby default a value of 1 (kg wwt/L) can be assumed.
Pow (Kow) of BaP used as marker substance for petro pitch is 1,350,000 (log Kow = 6.13 see Chapter 1.3 - Partition coefficient).
BCFearthworm= (0.84 + 0.012 x 1,350,000) / 1
= 16200 L/kg ww
Reference(cited in Guidance document on IR&CSA - Chapter R.16):
Jager T (1998) Mechanistic approach for estimating bioconcentration of organic chemicals in earthworms (Oligochaeta). Environ. Toxicol. Chem. 17, 2080-2090
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