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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

 Daphnia sp. Acute Immobilisation Test according to OECD Guideline 202. EC50 >100 mg/l. NOEC approx. 50 mg/l. (HD5)
LC50 (methylsilanetriol): 240 000 mg/l (QSAR)

Key value for chemical safety assessment

EC50/LC50 for marine water invertebrates:
100 mg/L

Additional information

Toxicity to aquatic invertebrates was studied in a valid Daphnia sp. acute immobilisation test with Daphnia magna according to OECD 202 under GLP. Test concentrations ranged from 1 to 100 mg/l (nominal concentrations) Because of rapid hydrolysis of the test substance, the stock solution was allowed to hydrolyse for 48 hours prior to test initiation under conditions that prevented evaporation of the test substance. No effect on daphnia survival or immobility could be observed. Under the conditions of the test, the hydrolysis products of the test substance did not induce toxicity to Daphnia magna. The estimated EC50 was >100 mg/L, the NOEC was ≥6.4 mg/l. The nominal NOEC is at a concentration at which polymers may have been present and, therefore, cannot be considered as true NOEC.

An LC50of 240 000 mg/l is calculated for the final hydrolysis product methylsilanetriol using an appropriate QSAR method (PFA 2013an).