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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 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).
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
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.
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