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EC number: 807-889-1
CAS number: 1255203-42-9
ErC50 (0 - 72h, Pseudokirchneriella subcapitata) was >0.00678 mg/L and the No observed effect concentration, NOErC (0 - 72h) was 0.00678 mg/L too.
A study was conducted in accordance with the OECD Guidelines for the
Testing of Chemicals No.201 “Freshwater Alga and Cyanobacteria, Growth
Inhibition Test” (2006). A water-accommodated fraction (WAF) with 100
mg/L loading rate was used to expose the test species to the test
substance because the substance was poorly water-soluble and difﬁcult to
be dissolved in the test solutions.
The measured concentration of the concentration group 1 at the beginning
of exposure was 0.0366 mg/L, and that at 72 hours after the beginning of
exposure was <0.002 mg/L. It was conﬁrmed that the concentration of the
test substance decreased during the exposure. The time weighted mean of
measured concentrations during the exposure period was 0.00678 mg/L.
No effects on algaö growth was observed. The determined 50% growth
inhibition concentration, ErC50 (0 - 72h) was >0.00678 mg/L (95%
conﬁdence limits: not available) and the No observed effect
concentration, NOErC (0 - 72h) was 0.00678 mg/L accordingly.
By microscopic observation at the end of exposure, in the concentration
group 1 neither unusual cell shape of algae (contraction, expansion,
damaged cell etc.) nor agglutination was observed, and the algae looked
normal compared with that in the control group.
Thus, the test substance had no effect on algal growth in this study.
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