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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

Pseudomonas putida.  16hr TT =6500mg/l
Paramaecium caudatum. 4hr LC50 = 5800mg/l
Uronema parduczi. 48hr TT=6120mg/l
Chilomonas paramecium 48hr TT=>10000mg/l
Entosiphon sulcatum. 72hr TT = 65mg/l
Tetrahymena pyriformis. 9 hr IC50 = 13100mg/l
Tetrahymena pyriformis. 48 hr EC50 = 11963mg/l

Key value for chemical safety assessment

EC50 for microorganisms:
5 800 mg/L

Additional information

A number of studies have been carried out to assess the toxicity of ethanol to micro-organism using multiple species of protozoa and bacteria in fresh water. These studies that are reliable indicate that the substance may be slightly toxic to micro-organisms. The weight of evidence suggested that the substance is generally of low toxicity. The 'standard' bacteria (P. putida) produced effect levels around the middle of the toxicity results. Ciliated protozoa are acceptable as surrogates to predict the toxicity in a WWTP; Paramecium meets this criteria (but not Entosiphon). The Paramecium figure is therefore selected as the key parameter from which to predict the hazard to degradation of substances in waste water treatment plants.