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Toxicity to aquatic algae and cyanobacteria

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Description of key information

FAT 40850/A TE is considered not acute toxic to aquatic freshwater green algae. However, the substance had a negative impact on the growth rate and biomass yield of green algae after exposure for 72 hours.

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The acute aquatic toxicity of the test item FAT 40850/A TE was tested in a valid GLP study according to EU Method C.3 by exposing the freshwater green algae Pseudokirchneriella subcapitata for 72 hours in a static toxicity test.

A series of nominal concentrations of 0, 1, 3.2, 10, 32 and 100 mg/L was tested. The samples from the nominal test concentrations of 1.0 and 3.2 mg/L were not analyzed, since these concentrations were below the NOEC determined in this test. For the higher concentrations, 7.1, 29 and 98 mg/L were measured at the end of the study period of 3 days.

A slight negative impact on the growth rate of green algae was seen at the nominal concentration of 100 mg/L (EC50 and EC10 values >100 mg/L, respectively). The negative impact on biomass yield was stronger and the corresponding EC50 value was >100 mg/L and the EC10 value was 32 mg/L.