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Toxicity to microorganisms

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Description of key information

NOEC=1000 mg/L (nominal concentration, corrected for water content of test item), Micro-organisms, OECD 209

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
1 000 mg/L

Additional information

The inhibitory effect of the the test item Mexoryl SBO on the respiration rate of aerobic waste water microorganisms of activated sludge was investigated in a 3 -hour respiration inhibition test according to the OECD TG 209.

Based on the EU testing guidelines, a limit test with a nominal test concentration of 1839 mg/L, equivalent to 1000 mg/L without water content, was performed. In addition, two controls and three different concentrations of the reference item 3,5 dichlrophenol (5, 16, and 50 mg/L) were tested in parallel. The results of these treatments confirmed suitability of the activated sludge and the method used.

The test item had no inhibitory effect on the respiration of the activated sludge after the incubation period of three hours at the test item concentration of 1839 mg/L, equivalent to 1000 mg/L without water content. Thus, the 3-hour NOEC (EC10) of test substance to activates sludge microorganisms was at least 1839 mg/L, equivalent to 1000 mg/L without water content. This value might even be higher but concentrations above 1839 mg/L were not tested.

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