Registration Dossier
Registration Dossier
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EC number: 217-915-8 | CAS number: 2008-39-1
Endpoint summary
Administrative data
Description of key information
Additional information
Dimethylammonium 2,4-dichlorophenoxyacetate is a non-volatile substance (calculated Henry’s Law Constant = 4.73 x 10-11Pa m3/mol), expected to degrade in air with a half-life of 62.8 hours. The substance dissociates in water into 2,4-dichlorophenoxyacetic acid, which is hydrolytically stable but susceptible of photodegradation in water (half-life under indirect photolysis 23.1 up to 541 days under direct photolysis). As demonstrated in a test (conducted with an analogue substance) according to OECD 301D, dimethylammonium 2,4 -dichlorophenoxyacetate is not readily biodegradable.
Once released into the environment it will be mainly distributed into the aquatic environment (99.6%, Mackay Level I calculation). The dissociation product, 2,4-dichlorophenoxyacetic acid is considered to be easily eliminated from water as indicated by a biodegradation value of 99% after 28 days in a Zahn-Wellens test and the short dissipation half-life in water/sediment systems of 29 days. Furthermore, this substance shows no adsorption potential to soil and sediment particles (Koc =56). Therefore, persistence in the environment is not expected. Bioaccumulation of dimethylammonium 2,4-dichlorophenoxyacetate in biota is unlikely in view of its low log Kow value (-0.57) at 20°C and pH=7.
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