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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

No data are available for trichloro(ethyl)silane. A 48-h EC50 value of 168.7 mg/l has however been determined for the effects of a read-across substance, Trimethoxyvinylsilane (2768 -02 -7), on mobility of Daphnia magna. A NOEC was not determined in the test. It is likely that the test organisms were primarily exposed to the hydrolysis products of the substance. 

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Additional information

No test data are available for trichloro(ethyl)silane. Reliable data for short-term toxicity to Daphnia magna 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.