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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

30 -min EC50 = 250 mg/L

Key value for chemical safety assessment

EC50 for microorganisms:
250 mg/L

Additional information

The assessment of the toxicity of NOP (CAS 2687 -94 -7) to aquatic microorganisms is based on experimental data from a respiration inhibition test according to OECD 209 (non-GLP, BASF AG, 1991; report no. 91/1784/08/1). Non-adapted activated sludge from a laboratory wastewater treatment plant fed with municipal sewage was used as inoculum. The 30 -min EC50 was determined to be 250 mg/L, based on nominal concentrations. The 30 -min EC20 was extrapolated to be 70 mg/L.

In an oxygen consumption test acording to German Industrial Standard DIN 38412, part 27 (draft), the effect on Pseudomonas putida was studied. The 30 -min EC10 was determined to be 170 mg/L (BASF AG, 1991; report no. 91/1784/71/1).