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EC number: 943-154-2
CAS number: -
The effective concentrations (ErCxand
EyCx) as well as the no observed effect
concentrations (NOErC and NOEyC) of the analogue
substance to the green alga Desmodesmus subspicatus based on the
average specific growth rate and the yield (algal biomass production)
were investigated over a period of 72 h according to the test guideline
Since the test item is well soluble,
the test media were prepared by respective dilutions of a stock solution
The investigated nominal
concentrationswere 40.0, 16.0, 6.40, 2.56 and 1.02 mg/l. Pure Algal
medium served as blank controls.
Three parallel test vessels were used
for each test concentration of the test item and six vessels forthe
The concentrations of the substance in
the test media were measured by DOC analysis at the beginning and after
24, 48 and 72 h of exposure. The analyses revealed that the
concentrations did not remain within the 80-120% of the nominal
concentration over the 72 h test period. Consequently, the effective
concentrations (ECx) were assessed based on the geometric
mean of the measured concentrations.
OECD 201, EC50r, 72h, Desmodesmus subspicatus = 6.29 mg/l
The analogue substance was tested for toxicity to aquatic algae
following OECD 201 (Ricci, 2016). Under the experimental conditions the
EC50r, 72h is equal to 6.29 mg/l.
Based on the read across considerations same results apply to Target
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