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EC number: 287-476-5
CAS number: 85535-84-8
Analyses of the spiking vials, following
addition of the spiked dry sediment aliquots to the test vessels on day
0, revealed that a mean of <0.1% (maximum 0.46%) of the radioactivity
remained on the walls of the vials, confirming the values of applied
% Mass Balance (Mean ± SD)
100 ± 12
80 ± 9.5
98 ± 11
77 ± 15
93 ± 11
77 ± 17
89 ± 12
75 ± 19
Kd = sediment-water partition
Koc = organic carbon partition coefficients
In a GLP study conducted according to OECD
Guideline 308, a C10 and a C13 chlorinated paraffin (65% chlorination)
were assessed for biodegradation in both freshwater and marine
sediments. The two radiolabelled test substances were separately spiked
into the sediment phase of both systems under both aerobic and anaerobic
conditions and aerobic biodegradation was monitored as the evolution of
carbon dioxide over a period of 98 days and anaerobic biodegradation
monitored as the evolution of methane and carbon dioxide over a period
of 86-100 days.
No parent compound analysis was conducted in
this study and so the extent of primary degradation was not determined.
However, under aerobic conditions, both test substances in both marine
and freshwater sediments showed biodegradation to carbon dioxide, the
biodegradation in the marine sediment being more rapid than that in the
freshwater sediment. In both sediments, the C10 paraffin biodegraded
faster than the C13 paraffin. The average half-lives of the two
chlorinated paraffins under aerobic conditions were around 1630 days in
freshwater sediment and around 450 days in marine sediment. Under
anaerobic conditions, there was insufficient mineralisation to methane
or carbon dioxide to allow half-life rates to be calculated for either
substance in either sediment.
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