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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 221-375-9 | CAS number: 3081-14-9
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
A test on ready biodegradability was conducted according to OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I)). After 28 days 77PD showed 12 % degradation. Therefore 77PD is not ready biodegradable (Bayer, 1990a).
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
Additional information
Some primary and secondary hydrolysis products (p-benzoquinone,p-hydroquinone and the relevant amines) are readily biodagradble.The question arises why the PPDs are not readily biodegradable, although some of their hydrolysis products (p-benzoquinone, p-hydroquinone, aniline and 1,4 -dimethylpentylamine) are known to biodegrade quite rapidly. Thus, limited biodegradation could have been expected. A possible explanation for this contradiction is the fact that p-hydroquinone is highly toxic against bacteria: Based on an EC50 of 71 mg/L and a NOEC of 1 mg/L the resulting PNEC(STP) is 0.71 mg/L. Biodegradation tests according to the OECD 30x series are typically performed with initial concentrations of 100 mg/L.
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.
