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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Link to relevant study record(s)

Description of key information

In the key-study an EC50-value for algae (growth rate) of 27.7 mg a.s./L and a NOEC of 0.95 mg a.s./L could be determined after 72 h. 
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

For AES (C12-13, 1-2.5EO) Na (CAS 161074-79-9) no acute test on algae is available. Thus, as a worst-case assumption, read-across is prepared to a study conducted with alcohol C12 -14 ethoxysulfates. In that tests Scenedesmus subspicatus were exposed to different concentrations of alcohol ethoxysulfates C12 -14 (2EO) (CAS 68891 -38 -3; content of active substance in test material: 69.7% a-WAS) in a static system according to the guidelines OECD 201 and EG Guideline 92/69 C.1. The GLP-study resulted in an EC50 (72 h)-value for growth rate of 27 mg/L as a-WAS (corresponding to 27.7 mg a.s./L) (Sasol, 1993c) and is determined as key study.