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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.
NOEC (3h) >= 1000 mg/L (nominal) for activated sludge (OECD 209)

Key value for chemical safety assessment

Additional information

For two ‘red disazo condensation pigments’(CAS 68516-75-6 and CAS 71566-54-6) the influence on the respiration of microorganisms were investigated in GLP guideline studies according to OECD 209 [DR.U.NOACK-LABORATORIEN, 2012; Experimental Toxicology and Ecology, BASF SE, 2012]. Both studies conducted with activated sludge from municipal sewage treatment plants, which predominantly receives domestic sewage. Up to the highest test concentration of 1000 mg/L (nominal) no inhibition on respiration observed after 3 hours of exposure.