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EC number: 815-305-1
CAS number: 138938-64-4
Hydrolysis half-life (silazane
group): Extremely rapid hydrolysis at 25°C (measured)
silazane group is expected to hydrolyse very rapidly (instantaneously)
in contact with water. This assumption is supported by a preliminary
hydrolysis study conducted on the submission substance prior to the
ready biodegradation study (Taruki 2014) using a method that is
equivalent to a preliminary hydrolysis study according to OECD 111.
the study, water was spiked with a known amount of the test substance
and duplicate test solutions were prepared. The dilute test solutions
were analysed using GC-FID; each sample was shaken, sampled and analysis
was performed. Sampling of the test substance was performed at various
time intervals of 0 hours (immediately after sample preparation), 0.5
hours, 1 hour and 1.5 hours. Sample analysis was performed immediately
after preparation using GC-FID.
t = 0 hours (immediately after sample preparation), t = 0.5 hours, t = 1
hour and t = 1.5 hours solutions, in the chromatograms of the sample
solution taken, there were no peaks observed at the characteristic
retention time of the test substance. No information on pH was stated;
the test temperature is 25°C. The result indicates that the test
substance undergoes very rapid hydrolysis when in contact with water.
The study is considered to be reliable.
hydrolysis products are tert-butyldimethylsilanol and piperazine.
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