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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

NOEC (18 h): >= 1088 mg/L for cell multiplication of Pseudomonas putida

Key value for chemical safety assessment

Additional information

Two reliable studies with Pseudomonas putida are available. One was conducted according to EN ISO 10712 and the other one according to a national guideline from Germany (LTwS Nr. 10, 1979). The basis for an effect was in both tests the growth inhibition of Pseudomonas putida within a 16 hours test period. Coenen (1988) observed no effect at the highest tested concentration of 1088 mg/L. Richterich and Mühlberg (2001) tested concentrations of 3000 and 10000 mg/L and observed effects at a concentration of 10000 mg/L. Thus, triacetin showed a low toxicity for Pseudomonas putida. As all tests were conducted with a single species system, which is more sensitive than a mixed microbial population in activated sludge and as triacetin is furthermore readily biodegradable, an inhibition of activated sludge in STP is not expected.