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EC number: 251-718-8
CAS number: 33885-52-8
A study was performed to assess the acute
toxicity of the substance to Daphnia magna under semi-static conditions
(renewal period: 24 hours). The study was conducted in accordance with
OECD TG 202 and GLP principles. Groups of twenty daphnids (less than 24
hours old) were exposed for 48 hours to five concentrations of the
substance dispersed in test water (4.6 - 100 % of a saturated solution
prepared at a loading rate of 100 mg/L) and an untreated control. The
incidence of immobilisation was recorded for each test and control group
at 24 hours and at 48 hours. After 24 hours at 0.46; 0.99; 2.3 and 5.0
mg/l 5, 30, 100 and 100% immobility, respectively was seen. At 48 hours
the immobilisation increased. At these concentrations the immobility was
35, 100, 100 and 100%, respectively. This results in the 48-h EC50 of 0
51 mg/L. All results are expressed in terms of arithmic mean measured
concentrations. Measured concentrations ranged from 73 - 89 % of initial
at the end of the first renewal period (t=0-24 hours) and 91 -95 % of
initial at the end of the second renewal period (t=24-48 hours).
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