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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

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. (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