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EC number: - | CAS number: -
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
ErL50 (72 h) > 100 mg/L (nominal, OECD 201)
NOErLR (72 h) ≥ 100 mg/L (nominal, OECD 201)
Key value for chemical safety assessment
Additional information
Two experimental studies are available investigating the effects
of Fatty acids C16-18 (even numbered), oligoesters with sucrose to
aquatic algae. Both studies were performed according to OECD 201 (GLP)
with the green algae Pseudokirchneriella subcapitata under comparable
conditions. The difference between the two studies is the preparation of
test solutions. In the key study the test substance was added directly
to the test vessels without a further processing step whereas the test
solutions were additionally filtered in the supporting study. Limit
loading rates of 100 mg/L were tested for a duration of 72 h. No
analytical monitoring of the actual test item concentrations was
performed. Thus, the effect concentrations were based on the nominal
loading rate only. The effects on growth rate were investigated by
measuring the chlorophyll content with a spectrophotometer (key study)
and coulter counter (supporting study). In addition algae cells were
checked microscopically at the end of exposure for any abnormalities.
At the end of exposure no inhibition of growth was recorded in both
studies resulting in an ErL50 (72 h) > 100 mg/L and a NOErLR (72 h) ≥
100 mg/L based on the nominal limit loading rate.
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