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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

There are no test data for the substance. However a 72-hour EC50 value of >833 mg/L and a NOEC of 167 mg/L have been determined for the effects of the related test substance,  3-chloropropyltrimethoxysilane (2530-87-2), on growth rate of Scenedesmus subspicatus (new name: Desmodesmus subspicatus). It is likely that the test organisms were predominantly exposed to the hydrolysis products of the substance.

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Additional information

No test data for toxicity aquatic algae and and cyanobacteria are available for Trichloro(3-chloropropyl)silane. However a study of toxicity to aquatic algae is available for the related substance 3-chloropropyltrimethoxysilane. Trichloro(3-chloropropyl)silane (CAS 2550-06-3) and 3-chloropropyltrimethoxysilane (2530-87-2) both hydrolyse 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.