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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 266-026-1 | CAS number: 65996-91-0 The distillate from coal tar having an approximate distillation range of 220°C to 450°C (428°F to 842°F). Composed primarily of three to four membered condensed ring aromatic hydrocarbons and other hydrocarbons.
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Based on screening criteria, the PAH taken as reference substances are not readily biodegradable. But some of them are considered to be inherently biodegradable (2- and 3-ring aromatic compounds) while 4- and more ring PAH are considered not to be biodegradable. The composition of distillates (coal tar), upper [CAS no. 65996-91-0]) - mostly 2, 3 and 4-ring PAH - indicates that the substance as a whole is not readily or inherently biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
Additional information
Some of the main components of distillates (coal tar), upper are used as supporting substances to characterise the biodegradation properties of Distillates (coal tar), upper (see above under Chapter 4.)
In a ready biodegradability test (OECD 301C), published in Japan, naphthalene proved to be readily biodegradable, while 1- and 2 -methylnaphthalenes showed easy biodegradability in a MITI(II) -test, equivalent to TG OECD 302C (Yoshida et al. 1983).
On the other hand, in a MITI-II test for inherent biodegradability similar to OECD TG 302C performed under the Japanese Chemical Inspection & Testing Institute, no biodegradation of the test substance naphthalene was observed.
In a MITI-I test for ready biodegradability according to OECD TG 301C performed under the Japanese Chemical Inspection & Testing Institute, no biodegradation of the test substance acenaphthene was observed.
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.
