Registration Dossier
Registration Dossier
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EC number: 242-560-0 | CAS number: 18765-38-3
Endpoint summary
Administrative data
Description of key information
Additional information
The distribution in a sewage treatment plant (STP) has been estimated using the SimpleTreat model (implemented in EUSES 2.1.2), see table below.
Tetrakis(2-butoxyethyl)orthosilicate hydrolyses rapidly (t1/2= 4 h at pH 7 and 25°C). The hydrolysis products are monosilicic acid and 2-butoxyethanol. Monosilicic acid exists only in dilute aqueous solutions and readily condenses at concentrations above approximately 100 - 150 mg/l as SiO2to give a dynamic equilibrium between monomer, oligomers and insoluble polysilicic acid. Monosilicic acid and its condensation products are naturally occurring inorganic substances that are ubiquitous in the environment and are expected to enter natural biogeochemical cycles in the environment. Due to the rapid hydrolysis of the parent substance, the distribution calculation is done for 2-butoxyethanol.
Table: Distribution modelling for STP
Fraction of emission directed to air by STP |
3E-03 |
[%] |
Fraction of emission directed to water by STP |
12.6 |
[%] |
Fraction of emission directed to sludge by STP |
0.26 |
[%] |
Fraction of the emission degraded in STP |
87.1 |
[%] |
2 -Butoxyethanol is readily biodegradable (OECD 1997) and is expected to predominantly biodegrade in a STP. 2 -Butoxyethanol has a low Henry’s Law constant and low log Kow/log Koc. Therefore, that which does not biodegrade is expected to partition mainly to the water compartment in a sewage treatment plant.
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