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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

EC50 (3 h) = 56 mg/L (nominal, OECD 209) 

Key value for chemical safety assessment

EC50 for microorganisms:
56 mg/L

Additional information

To investigate the effects of OPP (CAS-No. 90-43-7) on aquatic microorganisms two studies are available. In a non-GLP test, which was carried out according to OECD 209 using predominantly domestic sludge, an EC50 (3h) of 56 mg/L was determined (Klecka et al., 1983). The second test was performed according to ISO 8192 with industrial sludge. This test shows similar results as the test conducted with predominantly domestic sludge. The EC50 (3h) was 62.5 mg/L and the EC10 (3 h) was 31 mg/L (Mueller, 1990 and Weyers, 2006).