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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The most critical value was the 3-h EC50 of 260 mg/l in activated sludge conducted under modified OECD conditions.

Key value for chemical safety assessment

EC50 for microorganisms:
260 mg/L

Additional information

Various tests have been carried out to study the toxicity of trichloroethylene to microorganisms. One study with activated sludge was available, for this study a modified version of OECD 209 “Activated sludge respiration inhibition test” was used. This modified version used more dilute cell and substrate concentrations, and conducted tests in vessels sealed with PTFE plug to prevent loss by volatilization. The 3-h EC50 of 260 mg/l is used in the assessment. Lower EC50 values were found in other toxicity studies, however the endpoints were less relevant for micro-organisms in sewage treatment plants.