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EC number: 260-828-5
CAS number: 57583-34-3
METHOD OF CALCULATION: Measured Sn concentrations were used to estimate
test substance concentrations by applying a multiplication factor of
6.27 [the ratio of the molecular weights of Sn (118.71 g/mol) and the
test substance (743.7 g/mol)]; time weight average exposure
concentrations were calculated from the actual Sn concentrations.
In the lowest treatment group, the test concentrations were below the
limit of detection (LOD = 4.5 µg Sn/L), except at t = 12 and t = 16 days
in the newly prepared test solutions. Half the LOD (2.3 µg/L) was used
to calculate the Sn concentration.
Parental mortality was 100 % in Daphnia magna exposed to 50 %
(0.694 mg/L) and 100 % (2.315 mg/L) of the Water-Accommodated Fraction
of MMT(2-EHMA). Reproduction was not affected at concentrations up to
0.134 mg/L (10 % of the WAF). The 21-day LC50 for parental survival was
0.305 mg/L, the overall LOEC was >0.134 mg/L, and the overall NOEC was
0.134 based on measured concentrations. The test was conducted
according to OECD Test Guideline 211.
Chronic daphnia: Overall NOEC after 21-days 134 µg/L (OECD 211); 21-day
NOEC for reproduction ≥ 134 µg/L; 21-day LC50 for parental survival 305
µg/L; 21-day EC50 for reproduction >134 µg/L
The long-term toxicity to aquatic invertebrates was tested in an OECD
211 21-day Daphnia magna reproduction study. The study investigated the
effects on survival and reproductive performance. Exposure to
concentrations up to 134 µg/L did not induce significant inhibition of
the reproductive capacity of the parental daphnids. Exposure to 694 and
2315 µg/L induced complete mortality of the daphnids.
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