Registration Dossier
Registration Dossier
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EC number: 258-054-8 | CAS number: 52628-25-8
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
Ammonium
In a respiration test teh 30 min EC50 is determined to be 1618 mg/L.
Zinc
An activated sludge respiration test giving an EC50 (3d) of 5,2mg Zn/l (Dutka et al 1983).
So zinc is responsible for toxicity
Key value for chemical safety assessment
Additional information
Ammonium:
In a short term respiration test (domestic activated sludge), performed similar to OECD guideline 209, an EC20 of 1050 mg/L and an EC50 of 1618 mg/L were determined. Therefore, inhibition of degradation activity of activated sludge is not anticipated when introduced in appropriate low concentrations
Zinc:
Several data available for this endpoint. The EC50 reported from the study by Dutka et al (1983), is giving the lowest reliable value. This study was also used in the EU risk assessment to assess the PNEC for STP.
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