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EC number: 217-983-9
CAS number: 2031-67-6
(48-hour) EC50: >500 mg/l mobility Daphnia magna, reliability 1(48-hour) LC50: 29600 mg/l mortality, hydrolysis product (using an appropriate calculation method), reliability 2
A 48-hour EC50 value of >500 mg/l and NOEC of ≥500 mg/l have been
determined for the effects of the test substance on mobility of Daphnia
magna based on nominal concentration of the substance. The study was
conducted according to a standard guideline (EU Method C.2, Acute
Toxicity for Daphnia) and GLP and was selected as key study (1994). Two
other results are available from secondary literature and therefore of
lower reliability; an EC50 value of >1000 mg/l for Daphnia magna and an
LC50 value of 58 mg/l for Palaemonetes pugio (marine species) were
As the substance hydrolyses rapidly (half-life approximately 5.5
hours), it is very likely that the test organisms were primarily exposed
to the hydrolysis product, methylsilanetriol, retained in the test
media. An LC50 of 29600 mg/l was derived for the hydrolysis product
using an appropriate calculation method (2011).
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