Registration Dossier
Registration Dossier
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EC number: 200-902-6 | CAS number: 75-79-6
Short-term toxicity to fish
Administrative data
Link to relevant study record(s)
Description of key information
There are no test data for the substance. However a 96-hour LC50 value of >500 mg/L and NOEC of ≥500 mg/L (nominal concentration) have been determined for the effects of a read-across substance, Triethoxy(methyl)silane (CAS 2031-67-6), on mortality of Brachydanio rerio. The test organisms were primarily exposed to the hydrolysis products of the substance.
Key value for chemical safety assessment
Additional information
No test data for short-term toxicity to fish are available for trichloro(methyl)silane. However a study of short-term toxicity to fish is available for the related substance Triethoxy(methyl)silane. Trichloro(methyl)silane (CAS 75-79-6) and Triethoxy(methyl)silane (CAS 2031-67-6) both hydrolyse to methylsilanetriol. The hydrolysis half-lives of Trichloro(methyl)silane and Triethoxy(methyl)silane indicate that, under conditions relevant to ecotoxicity assessment, both will hydrolyse to methylsilanetriol in the course of the tests. The other hydrolysis products are hydrogen chloride and ethanol, respectively; the properties of these substances are well characterised. Ethanol is non-toxic to the environment and it is considered unlikely that it’s presence significantly affected the results of the test performed with triethoxy(methyl)silane.Effects of hydrogen chloride on aquatic organisms are limited to those that result from changes to pH in unbuffered media.
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