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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The test item FAT 40840/A TE had no significant inhibitory effect (≤15%) on the respiration rate of activated sludge after the incubation period of 3 hours at the limit test concentration of 1000 mg/L.

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Additional information

Alimit test with a nominal test concentration of 1000 mg/L was performed. In addition, two controls and three different concentrations of the reference item 3,5-dichlorophenol (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 rate of activated sludge after the incubation period of three hours at the test item concentration of 1000 mg/L. Thus, the 3-hour NOEC (EC15) of the test item to activated sludge microorganisms was at least 1000 mg/L. This value might even be higher but concentrations above 1000 mg/L were not tested. The 3-hour EC20, EC50, and EC80 could not be calculated but were clearly higher than 1000 mg/L.