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EC number: 200-521-5
CAS number: 61-82-5
Key study, US EPA-similar to OECD 202- GLP:
48h-LC50 (Daphnia magna)= 18 mg/L
In an acute aquatic toxicity study,
performed similarly to OECD Guideline 202 and in compliance with GLP,
groups (20/dose, 2 replicates of 10 daphnids/vessel) of Daphnia magna
were exposed to the test item at nominal concentrations of 0 (control),
10, 18, 32, 56 and 100 mg/L for 48 h under static conditions. All
vessels were observed at 24 and 48 h for mortality and abnormal effects
such as surfacing, clumping of the daphnids together and daphnids lying
on the bottom of test chambers. A preliminary range-finding test was
also conducted on daphnids (10/concentration) at 1, 10 and 100 mg/L
(nominal) and mortality and behavioural observations were observed for
48 h. In this previous test, mortalities at 1.0, 10 and 100 mg/L were 0,
0, and 0 at 24 h, and 0, 0 and 10 at 48 h, respectively.
In the main test, mortalities at 0, 10, 18,
32, 56 and 100 mg/L were 0, 0, 0, 0, 80 and 100% at 24 h; and 0, 0, 55,
95, 100 and 100% at 48 h, respectively. The 24 and 48 h LC50 values for
the test item in Daphnia magna was considered to be 47 (32-56) and 18
(16-21) mg/L (nominal concentrations), respectively. The highest tested
concentration without observed effect (48 h) was 10 mg/L, based on the
lack of mortality and abnormal effects.
Under the test conditions, the 48 h LC50 for
the test item was 18 (16-21) mg/L on Daphnia magna.
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