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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The toxicity of HDI trimer to algae (Desmodesmus subspicatus) was assessed performing a study according to the German standard: DIN 38 412, Part 9 (1989) "Zellvermehrungshemmtest: Scenedesmus subspicatus CHODAT (Grünalge)", which is in most parts equivalent to the OECD TG 201. The 72h-EC10 was 370 mg/L. The EC50 was > 1000 mg/L.
In a supporting study the toxicity of HDI trimer to algae (Desmodesmus subspicatus) was assessed performing a study according to the Directive 92/69/EEC, C.3: Algal inhibition test, which is in most parts equivalent to the OECD TG 201. No inhibition of the algal population as reduction in growth rate was observed after 72 h at a test concentration of 100 mg/L. The results are expressed in terms of nominal concentrations.

Key value for chemical safety assessment

EC50 for freshwater algae:
1 000 mg/L
EC10 or NOEC for freshwater algae:
370 mg/L

Additional information

The key value for acute toxicity should read >= 1000 mg/L but "<=" may not be selected.