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Ecotoxicological information

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There are no reliable aquatic toxicity data available for 3-[dimethoxy(methyl)silyl]propanethiol (CAS 31001-77-1), therefore good quality data for an appropriate structural analogue, 3-trimethoxysilylpropane-1-thiol (CAS 4420-74-0), have been read across. Reliable short-term toxicity tests results are available for invertebrates (Daphnia magna) and algae (Scenedesmus subspicatus (new name: Desmodesmus subspicatus)) for 3-trimethoxysilylpropane-1-thiol (CAS 4420-74-0). The relevant short-term values are:

Daphnia: EC50 (48 h): 6.7 mg/l (equivalent to 5.3 mg/l when expressed in terms of 3-(trihydroxysilyl)propanethiol); NOEC: 2.7 mg/l

Algae: ErC50 (72 h): 931 mg/l; ErC10: 92 mg/l; NOErC: 40 mg/l (the ErC50, ErC10 and NOErC are equivalent to 731, 72 and 31 mg/l respectively when expressed in terms of 3-(trihydroxysilyl)propanethiol)

The rapid hydrolysis of 3-trimethoxysilylpropane-1-thiol (CAS 4420-74-0) (half-life 2.6 h at pH 7 and 20-25 °C) means it is likely that the test organisms in each test were exposed primarily to the hydrolysis products, 3-(trihydroxysilyl)propanethiol.

Refer to Section 6 endpoint summary for further discussion of the approach to chemical safety assessment and justification for read across.