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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

Pitch, coal tar, high-temp. as such does not exhibit acute toxicity to aquatic microbial lifeforms. Hence no EC50 is determinable. As worst case, creosote is used as supporting substance in order to obtain a value that characterises toxicity to aquatic microorganisms.

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
36 mg/L

Additional information

For reasons of deriving a PNEC for STP, the impact of creosote on activated sludge was adopted as surrogate for mixed aromatic compounds and PAHs: the EC0 was found to be 36 mg/l (nominal).