Registration Dossier
Registration Dossier
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EC number: 250-807-9 | CAS number: 31795-24-1
Endpoint summary
Administrative data
Description of key information
Additional information
Potassium methylsilanetriolate is a mono-constituent ionic substance of 35-55% w/w potassium methylsilanetriolate in aqueous solution that has a very alkaline pH of >12. In more dilute aqueous solutions, the pH will be reduced dependent on concentration. As the pH is reduced, the concentration of the non-ionised form of methylsilanetriolate (methylsilanetriol) increases. At pH < 9.0, the substance is no longer in the ionised form and methylsilanetriol is the predominant species at low concentrations, with dimers and oligomers of methylsilanetriol forming at higher concentrations in water. Under comparable conditions of concentration and pH, methylsilanetriolate is equivalent to methylsilanetriol. Under conditions relevant for the environment (close to neutral pH and low concentration), the neutral monomer (methylsilanetriol) predominates (>99%).
Therefore, the environmental hazard assessment, including sediment and soil compartments due to water and moisture being present, is based on the properties of methylsilanetriol in accordance with REACH guidance for Chemical Safety Assessment. Methylsilanetriol is considered to be the species formed under the normal range of conditions of pH and temperature, and is the substance relevant to conventional REACH Chemical Safety Assessment. However, other biotic or abiotic reactions may occur over longer time-scales in the environment.
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