Registration Dossier
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EC number: 220-290-4 | CAS number: 2702-72-9
Biodegradation in water and sediment: simulation tests
Administrative data
Link to relevant study record(s)
Description of key information
Dissipation half-life of hydrolysis product in water/sediment system (2,4-Dichlorophenoxyacetic acid) = 29 days
Key value for chemical safety assessment
Additional information
No experimental data investigating the biodegradation in water of sodium 2,4-dichlorophenoxyacetate (CAS No. 2702-72-9) were available. This substance is highly soluble and it is rapidly dissociated in water, being 2,4-dichlorophenoxyacetic acid (CAS No. 94-75-7) its main product. Therefore, a conclusion on this endpoint was drawn based on data from 2,4-dichlorophenoxyacetic acid. The aerobic biodegradation of 14C 2,4-D in a water/sediment system was investigated by Concha and Shepler (1993). This study was conducted according to US EPA 40 CFR 158.130 Subdivision N (162 -4), Aerobic Aquatic Metabolism, under GLP conditions. The test substance was incubated for 46 days at a temperature of 25°C and radiocarbon measured periodically. After a lag period of 25 days, 2,4-D degraded rapidly. The major metabolite was CO2 (63.9% of the applied radioactivity on day 46). The estimated dissipation half-life of the test substance in the water/sediment system was 29 days.
Simulation testing on biodegradation of sodium 2,4-dichlorophenoxyacetate in sediment is not deemed necessary due to the low adsorption potential of its hydrolysis product, 2,4-dichlorophenoxyacetic acid (Koc = 56*)
* "Review report for the active substance 2,4 -D". European Comission, Health and Consumer Protection Directorate-General, Directorate E: Food safety: plant health, animal health and welfare, international questions, E1- Plant Health (2001)
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