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EC number: 220-449-8
CAS number: 2768-02-7
Table 1. Calculated concentration
of the test item using methanol concentration in test water
Measured concentration (mg/L)
(% of nominal)
New: Freshly prepared test
Old: Old test solutions before
*1: Time-weighted mean calculated
concentration during 21 days
*2: This value is estimate because
it is not within the range of the calibration curve.
*3: This value is given for
reference because of containing the estimate value.
Table 2. Mortality of parental
Nominal concentration (mg/L)
Mean measured concentration
Cumulative Number of Dead
Table 3. Cumulative number of
juveniles produced per adult alive for 21 days
Nominal Conc., mg/L
Calculated Cnc., mg/L
Mean Cumulative Numbers of Juveniles ± S.D.
Inhibition Rate (%)
107.8 ± 13.8
124.5 ± 18.9
108.0 ± 19.4
95.7 ± 17.2
69.8 ± 16.5
-: indicates no significant
**: indicates a significant
difference (a = 0.01) from the control.
21-day EC50: 119 mg/L
(extrapolated) and NOEC: 28.1 mg/L for effects of the test substance on
reproduction of Daphnia magna. Under the conditions of the test
it is likely that the test organisms were primarily exposed to the
hydrolysis products of the substance. The NOEC is equivalent to 20 mg/L
when expressed in terms of the silanol hydrolysis product,
vinylsilanetriol (CAS 143-48-6).
A 21-day EC50 of 119
mg/L (extrapolated) and NOEC of 28.1 mg/L (calculated concentration of
test substance using measured concentration of the non-silanol
hydrolysis product methanol (CAS 67-56-1; EC No. 200-659-6) have been
determined for the effects of the test substance on reproduction of Daphnia
magna. Under the conditions of the test it is likely that the test
organisms were primarily exposed to the hydrolysis products of the
substance. The results may be expressed in terms of the silanol
hydrolysis product by adjusting for the respective molecular weights: MW
hydrolysis product/MW parent * E(L)C50 or NOEC value, thus
106.15/148.24 * NOEC of 28.1 mg/L = 20 mg/L as vinylsilanetriol (CAS
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