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EC number: 245-659-7
CAS number: 23432-62-4
The results of each determination are shown in the following table:
Nominal test pH
Aqueous Phase pH
Partition coefficient (P’ow)
Dissociation constant (pKa)
* The results at pH 8 were excluded from the determination of the final
pKa mean and range on the basis that the accuracy of the estimation
method decreased as the distance between the dissociation constant and
the aqueous phase pH increased, pH 8.0 being >1.5 units from the final
estimation value. This is consistent with the approach used in the
titration method in OECD method 112.
Dissociation constant (substance): 17.48 (QSAR)
Dissociation constant (silanol hydrolysis product): pKa approximately 10
The requirement to test the substance for dissociation constant is
waived because in contact with water the substance rapidly hydrolyses to
form methyl [3-(trihydroxysilyl)propyl]carbamate and methanol. However,
the dissociation constant of the parent compound has been calculated
using an appropriate predictive method to be 17.48. Silanols are not
expected to undergo significant dissociation within an environmental
relevant range. This is supported by measured data for another
silanetriol (phenylsilanetriol) which has a first dissociation constant,
pKa = 9.6.
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