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Ecotoxicological information

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Reliable acute toxicity tests results are available for freshwater fish (Oncorhynchus mykiss), invertebrates (Daphnia magna) and algae (Pseudokirchnerella subcapitata). LC50 or EC50 values for the three organisms expressed in terms of measured concentrations were >110, >100 and >3.6 mg/l, respectively. The EC50 for the algae study expressed in terms of the nominal concentrations for the algae study is 120 mg/l. NOECs of 1.8 mg/l and 60 mg/l were determined in the algal test based on measured and nominal concentrations, respectively.

It is likely that under the flow-through conditions for the fish and invertebrate tests, the test organisms were exposed to primarily CNE and minor quantities of its hydrolysis products, (3‑trihydroxysilyl)propiononitrile and ethanol. In the static exposure system used for the 72-hr algal test, it is likely that exposure to the hydrolysis products would have predominated throughout the test period. Therefore, the nominal concentrations for the algae test are used for aquatic toxicity evaluation.