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Toxicity to aquatic algae and cyanobacteria

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A 72-hour EC50 value of >1053 mg/l and NOEC of 70 mg/l (initial measured concentration) have been determined for the effects of trimethylsilanol on growth rate of Selenastrum capricornutum (new name: Pseudokirchnerella subcapitata). The same algal test results expressed in terms of mean measured concentrations were >750 mg/l and 50 mg/l respectively. 
A 5-day EC50 of 2.0 mg NH3/l, and a 14 day LOEC of 3.0 mg NH3/l has been reported for the effects of amonia on abundance of Chlorella vulgaris.

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A reliable acute toxicity test result for hexamethyldisilazane is available for algae (Scenedesmus subspicatus). A72 h EC50 value of 50 mg/l and a NOEC of 7.5 mg/l was determined in the algal test. 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 trimethylsilanol (CAS 1066-40-6). A 72 EC50 value of >1053 mg/l and NOEC of 70 mg/l (initial measured concentration) have been determined for the effects of trimethylsilanol on growth rate of Selenastrum capricornutum (new name:Pseudokirchnerella subcapitata). The same algal test results expressed in terms of mean measured concentrations were >750 mg/l and 50 mg/l respectively.

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 five day EC50 of 2.0 mg NH3/l, and a 14 day LOEC of 3.0 mg NH3/l has been reported for toxicity of ammonia to algae.