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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to microorganisms

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Administrative data

Link to relevant study record(s)

Description of key information

Based on the test the EC50 value for the toxicity of the test item to bacteria was determined as > 1000 mg/L and the NOEC is 1000 mg/L.

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
1 000 mg/L

Additional information

An activated sludge respiration inhibition test was performed with the test item using a mixed population of activated sewage sludge microorganisms from the aeration Stage of Severn Trent Water Authority Sewage Treatment Plant, Belper, Derbyshire. The sample was maintained at 21°C with continuous aeration and used on the day of collection. The pH was buffered to pH 7.0 with sodium hydroxide solution and the suspended solids level adjusted to 3.8 g/l prior to use. As reference substance 3,5 dichlorophenol was used.

The oxygene-consumption rates were measured after 3 hours contact time and the percentage of inhibition was determined. For the test substance three tests were performed with a concentration of 1000 mg/L each resulting in 1, -7 and -7 % inhibition. Testing the reference substance 3,5 -dichlorophenol resulted in 87% inhibition for a concentration of 32 mg/L.

Based on the test the EC50 value for the toxicity of the test item to bacteria was determined as > 1000 mg/L and the NOEC is 1000 mg/L.