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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 220-290-4 | CAS number: 2702-72-9
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
The potential for ready biodegradability of sodium 2,4-dichlorophenoxyacetate (CAS No. 2702-72-9) was investigated in one study. This test was conducted according to OECD Guideline No. 301D, Closed Bottle Test (1992), under GLP conditions. The test material, at a concentration of 2 mg/L was incubated in activated sludge for 28 days, reaching a biodegradation value of 2.27% at test termination. As these results indicate that sodium 2,4-dichlorophenoxyacetate could be toxic to the inoculated bacteria, an additional experiment was conducted, at a lower concentration (1 mg/L), using a toxicity control. This second experiment reported 67.17% biodegradation of the test material on day 28. The results found in the toxicity control (8.37%) indicate that this substance might be inhibitory at higher concentrations. Based on this information, the substance can be considered as not readily biodegradable.
Sodium 2,4-dichlorophenoxyacetate (CAS No. 2702-72-9) is soluble in water, where it will be rapidly dissociated, mainly into 2,4-dichlorophenoxyacetic acid (CAS No. 94-75-7). The inherent biodegradability of this substance was investigated by Sorys (2004). This study was performed according to OECD Guideline 302B, Zahn-Wellens/EMPA test, under GLP conditions. Degradation of the test material reached 99% on day 28, showing that 2,4-dichlorophenoxyacetic acid is inherently biodegradable.
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.
