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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

In a weight of evidence approach a LC50 for fish of 1.3 mg/L could be determined using experimental data of 96 h tests.
Nevertheless that endpoint is not used for PNEC-calculation as PNEC-values were calculated on the basis of a HC5-approach.

Key value for chemical safety assessment

Additional information

Two full reports of studies conducted with freshwater fish are available.

One of these trials is conducted under GLP and followed the OECD 201- guideline. In this study alcohol C12 -15 ethoxylates (linear and branched - CAS 106232-83-1) were tested (Consonni, Sasol, 2003). In that study LC50 -value > 2 mg/L is reported for the mixture containing approximately 2.75 moles EO. In the other non-GLP, non-guideline study an LC50 -value between 1.3 - 1.7 mg/L is determined (Reiff, Shell, 1979). Both studies were used for a weight of evidence approach.

The LC50 reported in the key study is further supported by a study conducted with a marine fish. In that GLP-guideline study an LC50 -value of 3.1 mg/L is reported (Ystanes, Shell, 2004).

In addition three abstracts of studies are available which are not sufficient for evaluation. One of those studies reported an LC50-value of 0.59 mg/L for an alcohol ethoxylate with 3 ethoxy-groups. This value is representing the worst-case endpoint for fish, but is not relevant for risk assessment and classification as aquatic invertebrates and algae were more sensitive to the C12 - C15 mixture.