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EC number: 202-486-1
CAS number: 96-18-4
The available information about the abiotic degradation of 1,2,3
-trichloropropane show that the substance is rather stable in the
atmosphere and water, which are the most relevant compartments
considering the partitioning behaviour of the substance. This indicates
that 1,2,3-trichloropropane may travel over rather long distances in the
Degradation in the water compartment
The rate constant for hydrolysis of 1,2,3-trichloropropane was
determined under sterile conditions and at precisely measured
temperatures and adjusted pH values according to principles comparable
to those of the EU method C.7 (Ellington et al. 1987). The hydrolysis
rates were measured at different temperatures and at pH values of 3, 7
and 11. The accuracy and stability of the experimental conditions was
monitored by also determining the hydrolysis rates of three standard
reference compounds. The hydrolysis rate constant for
1,2,3-trichloropropane at 25 °C and neutral conditions calculated from
the experimental data is 1.8e-6 per hour, which corresponds to a
half-life of approximately 44 years. This indicates that hydrolysis is
not relevant with regard to the environmental degradation of
1,2,3-trichloropropane. Information about the phototransformation of the
substance in water is not available.
Degradation in the atmosphere
No experimental data on the photochemical degradation of
1,2,3-trichloropropane are available. However, as this degradation
pathway may be relevant for the substance, the disappearance half-life
due to reaction with photochemically generated OH-radical was modelled
using the EPIWIN V3.10, Atmospheric Oxidation Program (v1.90) modeling
component (U.S. Environmental Protection Agency, Office of Pollution
Prevention and Toxics, Washington, D.C.). The predicted atmospheric
half-life of 1,2,3 -trichloropropane is 30.5 days. The substance does
not absorb wavelengths in the spectrum of the sunlight and the predicted
half-life is fully attributable to indirect photochemical degradation by
OH-radical. The concentration of OH-radical in the model was 1,500,000
molecules per cm3 and the day-time was 12 hours.
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