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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

LC50 (96 h): 23 mg/l (tri(isopropyl)silyl acrylate) mortality Danio rerio, reliability 1 (RCC, 2005c).

LC50 (96 h): 13 mg/l (tris(1-methylethyl)silanol) mortality Danio rerio, reliability 1 (RCC, 2005c).

Key value for chemical safety assessment

LC50 for freshwater fish:
23 mg/L

Additional information

A 96 hour LC50 value of 23 mg/l (nominal concentrations of tri(isopropyl)silyl acrylate) has been determined for the effects of the registered substance on mortality of Brachydanio rerio (new name: Danio rerio). When expressed in terms of mean measured concentrations of tris(1-methylethyl)silanol the corresponding value is 13 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 2.8 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, particularly since a highly volatile siloxane dimer of tris(1-methylethyl)silanol may have formed at higher concentrations during preparation of stock solution and in test media.