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Ecotoxicological information

Toxicity to microorganisms

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Link to relevant study record(s)

Reference
Endpoint:
activated sludge nitrification inhibition testing
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:

Description of key information

The toxicity controls in the biodegradation tests proved that the test item was not toxic to the inoculum at concentrations far above the water solubility.

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
22 mg/L

Additional information

In the biodegradation studies, the toxicity controls proved that AHTN was not toxic to the inoculum at concentrations far above the water solubility. The NOEC used in the Risk Assessment Report of AHTN was higher (> 30 mg/L), but the reported value here was the lowest concentration used in the biodegradation tests. For the purpose of deriving the PNEC (STP), this value has been taken forward.