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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Endpoint summary

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Administrative data

Description of key information

Reactive Brown 49 has been tested for toxicity towards fish, invertebrates (daphnia), aquatic plants (algae) and sewage sludge bacteria and was found not being toxic to any of these trophic levels.


The results are- 

LC50(Brachydanio rerio, 96h): >100 mg/l

EC50(Daphnia magna, 48h): >100 mg/l

EC50(Scenedesmus subspicatus, 72h): >100 mg/l

IC50(sewage sludge bacteria, 3h): > 1000 mg/l


Additional information

Furthermore, it is known that Reactive Brown 49 hydrolyses considerably under environmental conditions (pH 7) in the aquatic environment with a half-life of only 2.7 days. Therefore, the substance can be regarded as rapidly degradable in the aquatic environment (according to CLP/GHS criteria) and is not expected to be present in the aquatic system for a longer time.