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Toxicity to microorganisms

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Description of key information

Perfluoro-N-methylmorpholine (PMM) is not expected to be toxic to activated sludge at the limit of water solubility.  Activated sludge 3-hour EC50 (respiration inhibition): >1000 mg/L (nominal) by OECD 209.

Key value for chemical safety assessment

Additional information

PMM is the most water soluble member of the Perfluorinated Organic Chemicals, C5-C18 category. The 3-hour EC50 (OECD 209) based on nominal concentration was in excess of 1000 mg/L. No toxic effects were observed at this loading rate. An additional study was methodologically flawed and is not considered further.