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Ecotoxicological information

Toxicity to aquatic plants other than algae

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Description of key information

Not toxic to aquatic plants.

Key value for chemical safety assessment

EC50 for freshwater plants:
2 590 mg/L
EC10 or NOEC for freshwater plants:
25.9 mg/L

Additional information

A GLP guideline study according to OECD 221 using Lemna gibba as a test organism was conducted on Direct Red 81.

This test was conducted instead of a study using algae because the test substance is a dyestuff which would influence the photosynthesis capacity of algae cells in the test solution. In this study, the ErC50 (7d) values on the frond number and the dry weight of the plants were determined to exceed the analytically verified test concentration of 2590 mg/L. The NOEC value on yhe frond numbers is < 25.9 mg/L.