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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

EC50 (48h) = 2.5 mg/L for Daphnia magna

LC50 (96h) = 9.9 mg/L for Crangon crangon

Nevertheless this endpoint is not used for PNEC-calculation as PNEC-values are calculated on the basis of a HC5-approach.

Key value for chemical safety assessment

Additional information

The toxicity of alcohol ethoxylate (C9-11, < 2.5 EO, CAS 68439-46-3) to aquatic invertebrates was investigated in two studies. The key study was performed with the water flea Daphnia magna under static conditions and without analytical monitoring (Stephenson, 1985). In this test which did not follow a defined guideline, an EC50 (48h) of 2.5 mg/L was determined.

In order to include information about the effect of alcohol ethoxylate on marine species, a supporting study with brown shrimp (Crangon crangon) was added (Douglas, 1990). This test was carried out according to GLP and the guidelines issued by the Ministry of Agriculture, Fisheries and Food of the United Kingdom. Brown shrimp was exposed for 96 hours under semi-static conditions. The LC50 (96 h) was determined to be 9.9 mg/L.