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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

EC50 (3h) > 1000 mg/l

Key value for chemical safety assessment

EC50 for microorganisms:
1 000 mg/L

Additional information

EU method C.11.

Preliminary test included:

- nominal concentrations of test substance of 10 (1 replicate), 100 (1 replicate) and 1000 (3 repliactes) mg/l.

- 2 blank controls

- 3 abiotic controls with test substance at 1000 mg/l

- 2 beakers to determine nitrification potential of sludge, without test substance

- nominal concentrations of 5, 10, 20 mg/l of 3,5 -dichlorophenol as reference substance.

No abiotic decomposition nor nitrifying activity were noted. Final results were expressed as nominal concentrations.

As no toxic effects were seen in all groups and 3 replicates (at 1000 mg/l) were included as recommended by the guideline, a definite study was considered as unnecessary.