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EC number: 943-080-0
CAS number: -
EC50 72h (freshwater OECD 202 study on Desmodesmus subspicatus) : > 100 mg/LNOEC 72h (freshwater OECD 202 study on Desmodesmus subspicatus) : > 100 mg/L
One valid experiment was performed.
The study was performed using 5 concentrations ranging from 4.6 to
No statistically significant inhibition of algal growth was
At the beginning and at the end of the test, the content of the
test item in the test solutions was estimated using DOC-determination.
Because of the very low solubility in test medium, no calculation
from carbon content of the test item and DOC measurement was possible.
The measured DOC concentrations in the treatments were in a similar low
range as the blank control. After 72 hours the measured DOC in the blank
control was unexpected high. This was probably caused by a contaminated
measuring vial. As algal growth was normal and the measured DOC at the
start of the test was in a normal range, this can be stated as
Therefore, the determination of the biological results was based
on the nominal concentration.
This is in agreement with the OECD guidance document no. 23, where
is stated: “For tests with chemicals that cannot be quantified by
analytical methods, the effect concentration can be expressed based on
the nominal concentrations (loading rates).”
The 72h-EC50s of potassium dichromate were determined in a
separate reference test. For the estimation of the 72h-EC50s of the
positive control, the fits showed sufficient statistical correspondence
of the data with the dose-response-equation. The values were within the
range of the laboratory.
All validity criteria were met.
No observations were made which might cause doubts concerning the
validity of the study outcome. The result of the test can be considered
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