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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

ErC50 (72 h) = 14 mg a.i./L (nominal) and NOEC (72 h) = 0.95 mg a.i./L (measured) for Scenedesmus subspicatus (OECD 201)

Key value for chemical safety assessment

EC50 for freshwater algae:
14 mg/L
EC10 or NOEC for freshwater algae:
0.95 mg/L

Additional information

For aquatic algae no studies on toxic effects of AES (C12-14, 1-2.5EO) NH4 (CAS 125301 -88 -4)are available.Therefore, a read-across approach from two comparable AES (C12 -14, 2.5EO) mixtures was applied.

For AES (C12-14, 1-2.5EO) MIPA (CAS 1187742 -72 -8) a GLP-study was performed according to OECD guideline 201. Based on growth rate an EC50 (72 h) of 14 mg a.i./L (nominal) for Scenedesmus subspicatus was observed (nominal). The corresponding NOEC (72 h) was 2 mg a.i./L (nominal) (Sasol, 1999).

For AES (C12-14, 1-2.5EO) Na (CAS 68891-38-3) a GLP-study was performed according to OECD guideline 201. Based on growth rate an EC50 (72 h) of 27.7 mg a.i./L (measured) for Scenedesmus subspicatus was determined. The corresponding NOEC (72 h) was 0.95 mg a.i./L (measured) (Sasol, 1993).