Registration Dossier
Registration Dossier
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EC number: 250-807-9 | CAS number: 31795-24-1
Long-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
No study of long-term invertebrates is available for the registration substance. A reliable study with a suitable read-across substance (trichloroethylsilane) is available. A 21-day NOEC value of ≥100 mg/l (nominal, highest concentration tested) (≥10 mg/l mean measured concentration) has been determined for effects on survival and reproduction of Daphnia magna. When expressed in terms of the silanol hydrolysis product, ethylsilanetriol, the NOEC value is equivalent to ≥45 mg/l based on measured recoveries.
Key value for chemical safety assessment
Additional information
There are no reliable long-term invertebrate toxicity data available for potassium methylsilanetriolate (CAS 31795-24-1), therefore good quality data for an appropriate structural analogue, trichloro(ethyl)silane (CAS 115-21-9), have been read across. Both substances form silanetriols in solution, methylsilanetriol and ethylsilanetriol, respectively. The other (hydrolysis) products are potassium and chlorides, respectively, and are not considered likely to contribute to effects observed in studies.
A 21-d NOEC of ≥100 mg/l (nominal, highest concentration tested) has been determined for the effects of trichloro(ethyl)silane (CAS 115-21-9) on reproduction and survival of Daphnia magna. In view of the very rapid hydrolysis rate of the tested substance, it is likely that the test organisms were exposed primarily to the hydrolysis products of the tested substance. TOC analysis of filtered media confirmed the presence of 10 mg DOC/l, which in terms of the silanol means 45 mg/l. The NOEC is therefore equivalent to ≥45 mg/l when expressed in terms of ethylsilanetriol based on measured recoveries.
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