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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

Pseudomonas putida: TT (16hr): 650mg/l
Entosiphon TT (72hr): 202mg/l
Uronema TT (48hr) 1620mg/l
Chilomona TT (48hr) 3248mg/l
Photobacterium phosphoreum: EC50 (5min) 1180, EC50 (2hr) 5870.
Pseudomonas fluorescens: EC50 (2hr) 7400, EC50 (5 mins) 1500 mg/l

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
650 mg/L

Additional information

From a variety of studies where a weight of evidence approach is used, the lowest reported toxicity values was a 72-hr toxicity threshold (EC5) of 202 mg/L for ethyl acetate in Entosiphon sulcatum. Results from ciliated protozoa can be used to predict toxicity in a WWTP, but Entisiphon does not fall into this category. In the more commonly tested bacterium Pseudomonas putida, the lowest reported NOEC (a 16-hr EC3) was 650 mg/L. Results for all other protozoa and bacterium were in excess of this value.