Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 266-028-2 | CAS number: 65996-93-2 The residue from the distillation of high temperature coal tar. A black solid with an approximate softening point from 30°C to 180°C (86°F to 356°F). Composed primarily of a complex mixture 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 the substance pitch, coal tar, high-temp. as such. Provisionally and as information for the chemical safety assessment, a terrestrial BCF for benzo[a]pyrene as marker substance 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 under Discussion).
Key value for chemical safety assessment
- BCF (terrestrial species):
- 16 200 L/kg ww
Additional information
According to ECHA Guidance on IR&CSA - Chapter R.16: Environmental exposure assessment (Version 3.0, February 2016) - Appendix A.16-3.3.8, Equation R.16 -66 (p. 134), 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 + 0.012Kow) / ROHearthworm
where for ROHearthworm by default a value of 1 (kg wwt/L) can be assumed.
Kow of BaP used as marker substance for pitch, coal tar, high-temp. 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 wwt
Reference (cited in ECHA Guidance document on IR&CSA - Chapter R.16):
Jager T (1998) Mechanistic approach for estimating bioconcentration of organic chemicals in earthworms (Oligochaeta). Environmental Toxicology and Chemistry 17(10), 2080-2090
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.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
