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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

There are no test data for the substance. However a 96-hour LC50 value of >100 mg/L and a NOEC of ≥100 mg/L have been determined for the effects of the related test substance,  3-chloropropyltrimethoxysilane (2530-87-2), on mortality of Brachydanio rerio (new name: Danio rerio). It is likely that the test organisms were predominantly 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(3-chloropropyl)silane. However a study of short-term toxicity to fish is available for the related substance 3-chloropropyltrimethoxysilane. Trichloro(3-chloropropyl)silane (CAS 2550-06-3) and 3-chloropropyltrimethoxysilane (2530-87-2) both hyrolyse to 3-chloropropylsilanetriol. The hydrolysis half-lives of Trichloro(3-chloropropyl)silane and 3-chloropropyltrimethoxysilane indicate that, under conditions relevant to ecotoxicity assessment, both will hydrolyse to chloropropylsilanetriol over the course of the test. The other hydrolysis products are methanol and hydrogen chloride, 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 3-chloropropyltrimethoxysilane.Effects of hydrogen chloride on aquatic organisms are limited to those that result from changes to pH in unbuffered media.