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EC number: 244-240-6
CAS number: 21145-77-7
The end points are based on measured values and
table 1 shows the AHTN concentrations in water.
Table 1 AHTN concentrations in water
The immonilisation and the number of
surviving/reproducing parents were also determined and are shown in
Table 2 Survival of parent daphnids
exposed to various concentrations of AHTN in a semi-static system for 21
days (values represent number of surviving parent daphnids).
mean reproduction per surviving and reproducing parent
tested at nominal concentrations ranging from 62.5-1000 µg/l
in Daphnia magna for reproduction and survival over 21 days in a
semi-static test following OECD guideline 202, part II. Mean
measured concentrations in 0.002% Tween 80 and 0.008% dimethylformamide
were determined to be 54.19, 112.9, 196.0, 400.5, and 804.0 µg/l
using HPLC. Test
media were renewed several times during the exposure period. No
significant immobility was reported at concentrations up to 196 µg/l
but 80% immobility was noted at 400.5 µg/l
and 100% was reported at 804 µg/l.
Reproductive output was not significantly affected at 54.19-196.0 µg/l
(ranging from 80-114% compared to solvent control) but was significantly
inhibited (p<=0.05) at 400.5 µg/l
by about 95%. No
reproduction occurred at the highest concentration. The 21-day NOEC and
LOEC values of the reproductive output (expressed as mean measured
concentrations) were 196 and 401µg/l,
respectively. The 21-day EC50 values (with 95% confidence limits) for
reproductive output and immobility of the parental generation were 244 µg/l
(238-249 ug/l) and 341µ/l
(243-433 ug/l), respectively.
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