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EC number: 606-548-2
CAS number: 204254-84-2
In the control the cell density increased from a nominal N = 1 x 104
cells/mL at the start of the test (0 hours) to N = 95 x 104
cells/mL (mean value) after 72 hours. Thus the algal growth in the
control was sufficiently high under the conditions of the test. The
validity criterion of increase of cell density by at least a factor of
16 over 72 hours was fulfilled. No remarkable observations were made
concerning the appearance of the test media. All test media were clear
solutions throughout the test period.
The influence of the test item on the growth of the green algal species Scenedesmus
subspicatus was investigated in a 72-hour static test. The nominal
test concentrations were 2.2, 4.6, 10, 22, 46 and 100 mg/L in parallel
with a control.
The test item had a statistically significant inhibitory effect on the
growth (biomass and growth rate) of Scenedesmus subspicatus after
the test period of 72 hours at concentrations of 22 mg/L (= 72-hour
LOEC: lowest concentration tested with toxic effects) and above. The
72-hour NOEC (highest concentration tested without toxic effects after a
test period of 72 hours) was determined to be 10 mg/L, since up to and
including this test concentration both the mean biomass and the mean
growth rate of the algae were not statistically significantly lower than
in the control.
The EC values as well ás the NOEC and LOEC were calculated for both
parameters, the algal biomass (b) and the growth rate (r), after 72
hours test duration:
n.d. - could not be determined
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