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Short-term toxicity to aquatic invertebrates

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Description of key information

A 48-hour EC50 value of 124 mg/l (measured concentration) has been determined for the effects of trimethylsilanol on mortality and mobility of Daphnia magna.
A 96-hour LC50 of 0.16 mg NH3/l has been reported for the effects of ammonia on mortality of Hyalella azteca.

Key value for chemical safety assessment

Additional information

A reliable acute toxicity test result for hexamethyldisilazane is available for invertebrates (Daphnia magna): 48 h EC50 80 mg/l. It is likely that the test organisms were predominantly exposed to the hydrolysis products of the substance.

Reliable short-term aquatic toxicity tests results are available for the test substance hydrolysis product, trimethylsilanol (CAS 1066-40-6). A 48-hour EC50value of 124 mg/l (measured concentration) has been determined for the effects of trimethylsilanol on mortality and mobility of Daphnia magna.

Reliable short-term test results are available for ammonia sourced from the Environment Agency Proposed EQS for Water Framework Directive Annex VIII Substances: Ammonia (unionised) 2007. A 96 h LC50 of 0.16 mg unionised NH3/l has been reported for short-term toxicity of ammonia to aquatic invertebrates.