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EC number: 257-077-0
CAS number: 51240-95-0
Results of net retention times of
reference and test substance
Average netretention time(min)
The graphs are uploaded in the
Figure 1 in the attachment displays the
graph of the theoretical values of Log Kocand the average Log
k of the reference substances. Figure 2 shows an example of a
HPLC-chromatogram from the analysis performed according to the test set
The average measured Log Kocvalue
for 1,1,3,3-tetramethylbutyl peroxyneodecanoate was calculated with the
retention time from two injections usingthe
calibration plot of Log Kocversus Log k of the selected
The result was calculated to be 4.7;
therefore 1,1,3,3-tetramethylbutyl peroxyneodecanoate had a Kocof
to study plan
The reference substances were dissolved in
mobile phase because dissolving in methanol, as originally mentioned in
the study plan, caused severe tailing of the response peaks in the HPLC
chromatogram which made an unambiguous identification difficult. The
test substance could not be dissolved in the mobile phase as it is very
poorly water soluble. Due to this it was not possible to prepare
mixtures of reference and test substances together. Mixtures of only
reference substances were still possible.
practical reasons the stock solutions of the reference substances were
dissolved in methanol. The diluted solutions of the reference
substances, injected into the HPLC, were finally dissolved in mobile
The adsorption coefficient (Koc)
of 1,1,3,3-tetramethylbutyl peroxyneodecanoatewas estimated using
the High Performance Liquid Chromatography (HPLC) method. The Koctest
was performed in accordance with the OECD guideline 121 withoutmodification.The
data on Koccan be used to predict the potential of the test
substance to partition to soil, sediment or sewage sludge.
The average measured log Koc value for
1,1,3,3-tetramethylbutyl peroxyneodecanoate as calculated from the test
The average measured log Koc value for 1,1,3,3-tetramethylbutyl peroxyneodecanoate as calculated from the test was 4.7. 1,1,3,3-tetramethylbutyl peroxyneodecanoate may therefore be considered to have a high potential to partition to soil, sediment or sewage sludge. The limitations of this data should be considered when concluding potential environmental risk due to the short half life of 1,1,3,3-tetramethylbutyl peroxyneodecanoate when considering both hydrolytic and thermal degradation endpoints. In reality the properties of the main degradation product 2,2,4-trimethylpentanol are of greater relevance when considering transport and distribution and particularly potential chronic effects. The low log Koc predictions of 2,2,4-trimethylpentanol (1.9) and the relatively high water solubility indicate a likely partitioning to the water phase.
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