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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The inhibition of the degradation activity of activated sludge is not anticipated when introduced in appropriate low concentrations.

Key value for chemical safety assessment

EC50 for microorganisms:
4 733 mg/L
EC10 or NOEC for microorganisms:
3 432 mg/L

Additional information

As key study a non-GLP test according to German Industrial Standard DIN 38412 was performed usingPseudomonas putidaas test organism. The EC10 (17h) was estimated to be 3432 mg/L and the EC50 was 4733 mg/L, both related to the nominal concentration (BASF AG 1989, report no. 9/0947/88/w, no analytical verification). In addition, a respiration inhibition test according to ISO 8192 was conducted (BASF AG 1988, report no. 01.102). The EC10 (30 min) was determined to be > 1000 mg/L (nominal, no analytical verification). However, the test was performed using industrial activated sludge and can therefore not be used for the derivation of the PNECstp.

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