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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The 3-hour EC50 based on respiration rate for activated sludge is 406 mg/L and the 3-hour NOEC is 60 mg/L.

Key value for chemical safety assessment

EC50 for microorganisms:
406 mg/L
EC10 or NOEC for microorganisms:
60 mg/L

Additional information

A 3-hour respiration inhibition test was carried out on potassium dicyanoaurate using activated sludge from mainly domestic sewage according to OECD guideline 209 (Brixham 2012). A reference substance test, range finding test and definitive test were carried out. EC50, EC20, NOEC and LOEC values (nominal) are reported based on respiration rate.