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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

ErC50 (72 h) = 3.57 mg a.i./L and NOEC (72 h) = 0.468 mg i.a./L for Pseudokirchneriella subcapitata  (nominal, OECD 201)

Key value for chemical safety assessment

EC50 for freshwater algae:
3.57 mg/L
EC10 or NOEC for freshwater algae:
0.468 mg/L

Additional information

To investigate the influence of OPP (CAS-No. 90-43-7) on the growth of aquatic algae the results of a GLP study according to OECD 201 are available (Hicks, 2002). Based on growth rate a 72- hour ErC50 of 3.57 mg a.i./L (measured) for Pseudokirchneriella subcapitata was determined. The corresponding NOEC (72 h) was 0.468 mg a.i./L

Additionally, effects of OPP on another green algae Desmodesmus subspicatus (formerly Scenedesmus subspicatus) were investigated by Caspers (1989). Due to significant deficiencies found in the methodology, (e.g. no analytical measurements) the test results should only be regarded as additional information and will not be used for the risk assessment.