Registration Dossier
Registration Dossier
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: 201-956-3 | CAS number: 89-98-5
Endpoint summary
Administrative data
Description of key information
Biodegradation:
Inherently biodegradable (WoE, OECD 302 B, OECD 301 D)
Additional information
A reliable study (Hoechst_1984, reliability 2) on inherent biodegradation, which was performed according to OECD-Guideline 302 B (Zahn-Wellens), shows 2-chlorobenzaldhyde to be inherently biodegradable: 2 -chlorobenzaldehyde was degraded in experiment A (151.0 mg/L DOC initial concentration) within 10 days of incubation by 95% and in experiment B (300.0 mg/L DOC initial concentration) within a 10 day window by about 75% at day 16 and by more than 95% at the end of the experiment (day 22). The study therefore shows the inherent, ultimate biodegradability of the test substance.
In another reliable study (Wellens_1990, reliability 2) performed also according to OECD-Guideline 302 B (Zahn-Wellens), within 13 days 100% of 2 -chlorobenzaldehyde was degraded and degradation proceeded in a 3 - day window corroborating the conclusion from the first study.
A insufficiently documented (therefore reliability category 3) study on ready biodegradability performed similar to Closed Bottle (OECD 301 D) with nonadaptedinoculum resulted in a degradation of 63 % (BOD) in a 10 day window within 20 days (Bayer_1973), fulfilling the requirements for ready biodegradability.
In a weight-of-evidence evaluation of these three studies it is concluded that 2 -chlorobenzaldehyde should be regarded as (at least) inherently biodegradable.
This conclusion is supported by an additional, less documented study on inherent biodegradation (Hoechst_1986, RL3), whereas a study performed according to OECD-Guideline 301 C (MITI I), reported in a secondary source only (reliability not assignable, RL4), failed to prove ready biodegradability. As this study is lacking important information, e.g. a reference substance demonstrating the functionality of the test conditions, its reliability is doubtful. In conclusion, the unequivocal results of the four other studies are not put into question by the MITI-study.
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.
