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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

EC50 (48 h): 3 mg/l (tri(isopropyl)silyl acrylate) mobility Daphnia magna, reliability 1 (RCC, 2005d).

EC50 (48 h): 1.4 mg/l (tris(1-methylethyl)silanol) mobility Daphnia magna, reliability 1 (RCC, 2005d).

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
3 mg/L

Additional information

A 48 hour EC50 value of 3 mg/l (nominal concentrations of tri(isopropyl)silyl acrylate) has been determined for the effects of the registered substance on mobility of Daphnia magna. When expressed in terms of mean measured concentrations of tris(1-methylethyl)silanol the corresponding value is 1.4 mg/l.

Concentrations of tri(isopropyl)silyl acrylate calculated from measured concentrations of tris(1-methylethyl)silanol were below nominal values. Tris(1-methylethyl)silanol has a Henry’s Law constant of 11.6 Pa m3/mol at 25°C and the discrepancy between the calculated and nominal concentrations may be explained by volatile losses arising during medium preparation and exposure.