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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Administrative data

Link to relevant study record(s)

Description of key information

Not considered to be harmful to Daphnia magna.

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
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.