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Toxicity to microorganisms

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Description of key information

OECD 209 Activated sludge respiration inhibition 3 hour EC50 721 mg/L, EC10 141 mg/L.

Key value for chemical safety assessment

EC50 for microorganisms:
721 mg/L
EC10 or NOEC for microorganisms:
141 mg/L

Additional information

The toxicity of the test item TOFA_DimerFA_TEPA_PAA (batch no.: BB 000649 V1) to activated sludge was determined in accordance with OECD Test Guideline 209 at Akzo Nobel, Arnhem, The Netherlands.

The toxicity of TOFA_DimerFA_TEPA_PAA to activated sludge was determined at a contact time of 3 hours, using various concentrations of the test substance.


The EC50of TOFA_DimerFA_TEPA_PAA for activated sludge after 3 hours contact time is 721 mg/L. The EC10 and EC20 are 141 and 247 mg/L, respectively.


TOFA_DimerFA_TEPA_PAA is therefore considered not harmful to activated sludge.