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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

In the key-study an EC50-value for daphnids of 7.4 mg a.s./L could be determined after 48 h of exposure. 
Nevertheless that endpoint is not used for PNEC-calculation as PNEC-values were calculated on the basis of a QSAR-model for chronic toxicity.

Key value for chemical safety assessment

Additional information

One GLP-study is available for AES (C12-13, 1-2.5EO) Na (CAS 161074-79-9). In that study daphnids were tested with a mixture containing 3 ethoxy groups. The test was conducted according to OECD 202. In the semi-static study an EC50 -value of 9.1 mg test material/L was determined (Unilever, 1992). As the substance tested in the study contains low amounts of active substance (26.5%), additional read-across to data available for the alcohol C12 -14 ethoxysulfates (2EO) is prepared. In that study Daphnia magna were exposed to different concentrations of alcohol ethoxysulfates (2EO) (purity of the test substance. 71.5% a.s. and 69.7% a-WAS) in a static system according to the guidelines OECD 202 and EG Guideline 92/69/EWG under GLP-conditions. In that study an EC50 (48 h)-value of 7.2 mg/L based on a-WAS (corresponding to 7.4 mg a.s./L) could be determined (Sasol, 1993b). Both studies were used for a weight of evidence approach.