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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

48-h EC50: 168.7 mg/L for effects of the test substance on mobility of Daphnia magna. It is likely that the test organisms were primarily exposed to the hydrolysis products of the substance. The EC50 is equivalent to 121 mg/L when expressed in terms of the silanol hydrolysis product vinylsilanetriol.

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
121 mg/L

Additional information

A 48-h EC50 value of 168.7 mg/L (nominal concentration) has been determined for the effects of the test substance on mobility of Daphnia magna. It is likely that the test organisms were primarily exposed to the hydrolysis products of the substance. The results may be expressed in terms of the silanol hydrolysis product, by adjusting for the respective molecular weights: MW hydrolysis product/MW parent * E(L)C50 or NOEC value, thus 106.15/148.24 * EC50 of 168.7 mg/L = 121 mg/L as vinylsilantriol.

The results of this test were selected in preference to those of four other tests because a definitive EC50 value was determined and it was judged to be more reliable.

The following result is from a reliable study included as supporting data:

48-hour EC50 >100 mg/L for effects of the test substance on mobility of Daphnia magna (Dow Corning, 1979).

Three further studies, for which their reliability could not be ascertained, are also included in the dataset:

48-hour EC50 >100 mg/L for effects of the test substance on mobility of Daphnia magna (Bement, 2001).

EC50 360 mg/L for effects of the test substance on mobility of Daphnia magna (Chandra, 1997).

48-hour EC50 >100 mg/L for effects of the test substance on mobility of Daphnia magna (MOE Japan, 2005).