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EC number: 205-746-2
CAS number: 149-74-6
Table 1. Test results - first test (without pH adjustment)
Table 2. Results of analysis of test media - first test (without pH
Note: theoretical DOC concentrations recalculated by the current
Table 3. Test results - second test (with pH adjustment)
Short-term toxicity to invertebrates: 48-hour EC50 >100
mg/l (nominal) (highest concentration tested) (OECD Guideline 202
(Daphnia sp. Acute Immobilisation Test)). The observations in this study
are attributed to the exposure of test organisms to the hydrolysis
products in the test system. The result may be expressed in terms of
concentration of the hydrolysis product: 48-hour EC50 >81
mg/l as methylphenylsilanediol.
A 48-hour EC50 value of 38 mg/l has been
determined for the effects of the test substance on mobility of Daphnia
magna based on nominal test concentrations and
under conditions of no pH adjustment. However, pH was reported to be <5.6 in
the 46.4 mg/L nominal treatment and <3.0 in the 100 mg/L nominal
treatment, therefore the result is not reliable and is disregarded.
Under conditions where pH was adjusted the corresponding value was >100
mg/l. Due to the very rapid hydrolysis it is very likely that the test
organisms were exposed to the hydrolysis products of the substance
rather than the parent substance. The results may be expressed in terms
of concentration of the hydrolysis product, methylphenylsilanediol, by
applying a molecular weight correction: (MW of silanol = 154.24 / MW of
parent = 191.13) * [CONCENTRATION OF PARENT = >100] = >81 mg/l.
The following data are used to support the read-across in the fish and
algal trophic levels:
A 48-hour EC50 value of >100 mg/l has been
determined for the effects of the supporting analogue substance,
trichloro(phenyl)silane (CAS 98-13-5), on mobility of Daphnia
magna. It is likely that the test organisms were predominantly
exposed to the hydrolysis products of the test substance,
phenylsilanetriol and hydrochloric acid.
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