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EC number: 202-716-0
CAS number: 98-95-3
During incubation of nitrobenzene in an
aquifer system (groundwater plus fine material of sediment) no
biodegradation was observed during the exposure period of 150 days. The
incubation was performed at 10°C in the dark in a slowly rotating box
with aeration taking place (minimum oxygen concentration 9 mg/l). The
test substance was monitored by GC-FID and GC-ECD, the initial
concentration was 0.15 mg/l (Nielsen et al., 1996).
In an earlier study performed by the same
author (Nielsen and Christensen, 1994) sediment and groundwater were
incubated with a mixture of organic compounds containing nitrobenzene at
a concentration of 0.15 mg/l. After a lag phase of 70 days nitrobenzene
was primarily degraded by 100% within 20 days in only 2 out of 16
experiments. No degradation took place in the other experiments. No
explanation for this inconsistency is given. These results are
considered not valid, however they confirm that nitrobenzene is
persistent under environmental conditions.
20% primary degradation of nitrobenzene in
an aquifer test system with an initial concentration of 0.1 mg/l were
found after 50 days (Albrechtsen et al., 1997). Again a mixture of
chemicals was tested. This time a control sample was examined. The
decrease of nitrobenzene in this control was 15%. Hence the loss of
nitrobenzene was mainly due to abiotic elimination processes such as
It is not possible to derive a degradation
rate constant for the sediment. All that can be said is that
nitrobenzene in sediment is not biodegradable in the tests described
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