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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

Short-term toxicity to invertebrate: 48-h EC50 169 mg/l (nominal) (EU method C.2), read-across from an analogous substance, trimethoxyvinylsilane (CAS 2768-02-7). The EC50 is equivalent to 121 mg/l when expressed in terms of the silanol hydrolysis product. 

Key value for chemical safety assessment

Additional information

There are no reliable short-term invertebrate toxicity data available for tris(isopropenyloxy)(vinyl)silane (CAS 15332-99-7), therefore good quality data for an appropriate structural analogue, trimethoxyvinylsilane (CAS 2768-02-7), have been read across. Both substances share the same silanol hydrolysis product, vinylsilanetriol. The other hydrolysis products are propen-2-ol and methanol, respectively.

A 48-h EC50 value of 169 mg/l (nominal) has been determined for the effects of trimethyl(vinyl)silane (CAS 2768-02-7) on mobility of Daphnia magna. In view of the test media preparation method/exposure regime it is likely that the test organisms were exposed predominantly to the hydrolysis products of the tested substance. The results may be expressed in terms of concentration of the hydrolysis product, vinylsilanetriol, by applying a molecular weight correction: (MW of silanol = 106.15 / MW of parent = 148.24) * 169 = 121 mg/l as vinylsilanetriol.

 

Refer to the discussion in the Section 6 endpoint summary for further discussion of the approach to chemical safety assessment for this registration substance, and justification for read-across used.

References:

Hüls (1993). Bestimmung der Auswirkungen von Dynasylan VTMO auf das Schwimmverhalten von Daphnia magna (nach EG 84/449, Nov 1989). Testing laboratory: Hüls Aktiengesellschaft, Marl, Germany. Report no.: DK-561. Owner company: Evonik. Report date: 1993-08-04.