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EC number: 500-513-4 | CAS number: 161074-79-9 1 - 2.5 moles ethoxylated
Short-term toxicity to fish
Administrative data
Link to relevant study record(s)
Description of key information
In the key-study a LC50-value for fish of 7.1 mg a.s./L could be determined after 96 h after 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 rainbow trout were tested with a mixture containing 3 ethoxy groups. The test was conducted according to a standard operating procedure which is not described in the study. In the semi-static study an LC50 -value of approximately 10.4 mg/L was determined (Unilever, 1988b). As the substance tested in the study contains low amounts of active substance (26.5%) and the method is not described in the study, additional read-across to data available for the alcohols C12 -14 ethoxysulfates (2EO) is prepared. The read-across study is conducted under GLP according to the guidelines OECD 203 and EG 92/69 C.1. In that test zebrafish (Danio rerio) were exposed to different concentrations of the mixture in a flow-through system (Sasol, 1995b). The resulting LC50 value is reported to be 7.1 mg a.s./L. Both studies were used for a weight of evidence approach.
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