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EC number: 202-486-1
CAS number: 96-18-4
The reductive dechlorination of 1,2,3-trichloropropane was tested under
anoxic conditions using anaerobic sediment samples taken from a river in
the central Netherlands. The test was carried out for 14 days with a
number of sealed, air-tight testing tubes with the lowest chemical
concentration possible (test concentration for TCP was not provided, but
was below 2E-05 mol/L). During testing period the reductive degradation
was studied by sacrificing testing tubes at regular intervals and
analysing the concentration of the test substance by gas chromatography.
The primary degradation under anaerobic conditions followed zero-order
kinetics and the reaction rate constant was 0.71 mmol/L per day. The
resulting half-life for primary degradation was 7 days.
The reductive dehalogenation of TCP under anaerobic conditions is
linear. There was no lag phase of degradation in the present study and
microbial populations may be able to immediately utilise the
contaminant. No increase in degradation velocity was observed over time
and constant dehalogenation of TCP occurred. Two explanations for these
observations are possible: Either the microbial populations able to
utilise 1,2,3-trichloropropane had a limited capacity for
dehalogenation, which did not grow in the course of the 14-day testing
period meaning that the population size did not significantly change
over the testing period. Or the bioavailability of the test substance at
the test concentration may be limited and dehalogenation of the
substance may require a certain period of time.
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