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EC number: 438-600-3
CAS number: 110675-26-8
The mean measured test item concentration in the analyzed test medium
samples of the highest test concentration were in the range of 11 to 12
µg/l at the start of the test medium renewal periods. At the end of the
test medium renewal periods, the concentrations decreased to 5.2 and 5.4
µg/l. This might have been caused by precipitation of finely dispersed
test item, since the highest test concentration was clearly above the
solubility limit of the test item in test water, which was < 7.4 µg/l.
Therefore, all biological results are related to the total mean measured
test item concentration of 8.8 µg/l (calculated as the average over all
measurements of the test concentration during the test period of 21
In the controls and all test concentrations up to and including 8.8 µg/l
(nominal 16 µg/l) the survival rate of the test animals at the end of
the test was at least 90% or higher. Thus, the survival rate of Daphnia
magna after 21 days was not significantly (>10%) reduced up to the
highest test concentration.
The mean reproduction rate of the daphnids in the control and the
solvent control was 90.7 ± 13.7 (mean ± SD) respectively 93.8 ± 17.4
(mean ± SD) alive offspring per adult. Compared to the control
respectively to the solvent control, no significant toxic effect of the
test item on the mean reproduction rate was determined up to and
including the highest test concentration of 8.8 µg/l (nominal 16 µg/l)
(results of a Williams-Test, one-sided smaller, a = 0.05).
The 21-day EC50 for the reproduction rate of Daphnia magna could not be
calculated due to the absence of a toxic effect, but is clearly higher
than 8.8 µg/l
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