Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

During incubation of the green alga Selenastrum capricornutum (new name: Pseudokirchneriella subcapitata) with the substance according to EPA OPP 122-2 (Algal Toxicity, Tiers I and II), inhibition of algal growth was observable during the 5 d incubation period with an EC50 value of 4.9 µg/L and a NOEC of 1.83 µg/L. For blue-green algae (tested: Anabaena flos-aquae)  no inhibition of algal growth was observable up to the maximum technically achievable concentration of the substance at approximately 0.058 mg/L.

Key value for chemical safety assessment

EC50 for freshwater algae:
4.9 µg/L
EC10 or NOEC for freshwater algae:
1.83 µg/L

Additional information

As the substance is manufactured due to its herbicidal activities, effect on green alge is expected. Apparently, cyanobacteria are less sensitive to (2-ethoxy-1-methyl-2-oxoethyl)-5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoate than green algae.