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Ecotoxicological information

Toxicity to aquatic plants other than algae

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Description of key information

ECr50 > 2540 mg/L

Key value for chemical safety assessment

EC50 for freshwater plants:
2 540 mg/L

Additional information

No information on "toxicity to aquatic plants other than algae" is available for the Target Substance. However data on a Similar Substance (Similar Substance 02) has been taken ito account for the assessment. More information about the similarity between the two substances is reported in section 13. The study on Similar Substance 02 was performed according to the OECD Guideline 221. The results show that the test item is not toxic to Lemna minor with EC50 > 2540 mg/L.

Lemna minor is an aquatic plant that develops its leaves on the surface of the water, while nourishing substances are taken from the water solution. With this tests the observed effect is only related to the potential toxicity of the substance and not to the potential shading effect of a classical Alga study. A deviation to the protocol has been applied to the test recommended for dyes (Michael Cleuvers a, Hans-Toni Ratte, Phytotoxicity of coloured substances: is Lemna Duckweed an alternative to the algal growth inhibition test. Chemosphere 49 (2002) 9–15): "Beakers will be incubated on a black non-reflecting surface. Additionally, the walls of the incubation chambers will also be covered with black fabric in order to avoid reflection".