Registration Dossier

Diss Factsheets

Ecotoxicological information

Toxicity to aquatic plants other than algae

Currently viewing:

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)