Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

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 environment.

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.