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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

No data are available for trichloro(ethyl)silane. A 96-hour LC50 value of 191 mg/l and NOEC of 100 mg/l have however been determined for the effects of a read-across substance, Trimethoxyvinylsilane (2768 -02 -7), on mortality of Oncorhynchus mykiss. It is likely that the test organism were primarily exposed to the hydrolysis product of the test substance.

Key value for chemical safety assessment

Additional information

No test data are available for trichloro(ethyl)silane. Reliable data for short-term toxicity to fish are however available for the read-across substance, trimethoxy(vinyl)silane (CAS 2768-02-7). Trimethoxy(vinyl)silane is a close structural analogue of trichloro(ethyl)silane, and the hydrolysis half-lives of trimethoxy(vinyl)silane and trichloro(ethyl)silane indicate that, under conditions relevant to ecotoxicity assessment, both will hydrolyse to similar hydrolysis products vinylsilanetriol and ethylsilanetriol respectively over the course of the test.

The other hydrolysis products are hydrogen chloride and methanol, respectively; the properties of these substances are well characterised. Methanol is non-toxic to the environment and it is considered unlikely that its presence significantly affected the results of the test performed with trimethoxy(vinyl)silane. The effects of hydrogen chloride on aquatic organisms are limited to those that result from changes to pH in unbuffered media.