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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

Not considered to be harmful to Daphnia magna.

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
157 mg/L

Additional information

The 48-hour EC50 for Daphnia magna exposed to 2,4,7,9-tetramethyldecane-4,7-diol was 127 mg active ingredient/L (95% confidence limit of 108 to 151 mg ai/L) based on mean measured concentrations.

The 24-hour EC50 was 157 mg ai/L (95% confidence limit of 147 to 168 mg ai/L).

Following a range-finding test, the nominal concentrations of the test item selected for the definitive test were 31.3, 62.5, 125, 250, and 500 mg ai/L (actual measured concentrations were 28.5, 56.7, 114, 232, and 471 mg ai/L). No undissolved test substance was observed in any of the test chambers throughout the duration of the test, although a strong chemical odor was observed coming from the 250 and 500 mg ai/L test concentrations.

Mortality of Daphnia magna exposed for 48 hours to teh test item was zero percent at the 28.5 mg ai/L test concentration. Testing concentrations 56.7 and 114 mg ai/L yielded 15 and 20% mortality, respectively. Testing concentrations 232 and 471 mg ai/L both yielded 100% mortality. Control mortality was zero percent. Animals were observed to be lethargic (a sublethal effect) in testing concentrations 28.5, 56.7, and 114 mg ai/L on Day 2 of the test.