Registration Dossier
Registration Dossier
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EC number: 220-290-4 | CAS number: 2702-72-9
Toxicity to aquatic plants other than algae
Administrative data
Link to relevant study record(s)
Description of key information
NOEC (14d) = 0.27 mg test substance/L (0.18 mg a.i./L)
Key value for chemical safety assessment
Additional information
No information about the toxicity of sodium 2,4-dichlorophenoxyacetate to aquatic plants is available, and therefore, conclusions on this endpoint are drawn based on data from an analogue substance. The toxicity of dimethylammonium 2,4-dichlorophenoxyacetate (CAS No. 2008-39-1) to a floating aquatic macrophyte, Lemna gibba, was evaluated in a study by Hughes (1990). This test was conducted according to EPA/FIFRA 123-2 Standard method of testing effects on freshwater macrophytes, under GLP conditions. After 14 days exposure within a static water regime, growth inhibition ranged from 14.1% (0.27 mg/L) to 91.4% (7.6 mg/L). The resulting EC50 and NOEC were 0.58 mg test substance/L and 0.27 mg test substance/L (corresponding to 0.38 and 0.18 mg a.i./L)
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