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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The lowest threshold level (40-min EC50) was 2590 mg/L in aerobic domestic sludge.

Key value for chemical safety assessment

EC50 for microorganisms:
2 590 mg/L

Additional information

The toxicity of dichloromethane to activated sludge was evaluated by a simple respirometric procedure set up on the basis of OECD Method 209 (Ricco et al., 2004). The exposure duration, however, was only 40 minutes. Several other studies were available; however these studies were either less relevant for toxicity towards STP-organisms or the toxicity values were indecisive (greater than values). Therefore the study by Ricco et al. (2004) was used in the assessment