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Ecotoxicological information

Toxicity to aquatic plants other than algae

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Description of key information

The growth of Lemna minor was determined after 7 days of exposure. Based on the results growth of duckweed was affected by pH. In test sets supplemented with EDTA between 40 und 200 µM concentrations, growth inhibition was observed in the test medium with adjusted pH of 7.0 at EDTA concentration of 100 µM and higher.

Key value for chemical safety assessment

EC10 or NOEC for freshwater plants:
29.2 mg/L

Additional information

Data of the toxicity of EDTA (acid form) on the duckweed Lemna minor are available, for justification for read-across see IUCLID 5, Chapter 13. The test substance is a complexing agent which can dispose micronutrients from the culture medium. Therefore duckweed growth can be significantly reduced under standardized guideline conditions and may yield apparent results that are more or less severe than the true toxicity (see Guidance on Hazard to the Aquatic Environment Globally Harmonized System GHS Annex 9 A9.3.3.4, 2007). This was indicated by the results of this study. Data revealed that growth were dependent on the concentration of EDTA and pH.