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Environmental fate & pathways

Phototransformation in air

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Reference
Endpoint:
phototransformation in air
Type of information:
(Q)SAR
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model and falling into its applicability domain, with limited documentation / justification
Principles of method if other than guideline:
No guideline necessary, results obtained from modelling using EPIWIN V3.10
GLP compliance:
no
Estimation method (if used):
Estimation Programs Interface for Microsoft® Windows (EPIWIN V3.10, U.S. Environmental Protection Agency, Office of Pollution Prevention and Toxics, Washington, D.C.), Atmospheric Oxidation Program (v1.90) modeling component. Model executed on March 5, 2002.
Preliminary study:
The AOP component of EPIWIN was used to calculate the rate of photodegradation for 1,2,3-trichloropropane. The half-life was calculated to be 30.5 days. There is no absorption of solar radiation by 1,2,3-TCPa in the troposphere. Only indirect photolysis (reaction with OH) occurs. The overall rate constant (KOH) was determined to be 0.3511 x 10-12 cm3/molecule-sec. The half-life of 30.5 days is based on a mean hydroxyl radical concentration of 1.5E6 per cm3 over a 12-hour day.
DT50:
30.5 d
Test condition:
mean hydroxyl radical concentration of 1.5E6 per cm3 over a 12-hour day.
Transformation products:
not specified
Validity criteria fulfilled:
yes
Conclusions:
The dissipation half-life of 1,2,3-trichloropropane calculated with the AOP component of the EPIWIN program is 30.5 days.
Executive summary:

The atmospheric dissipation half-life due to photodegradation of 1,2,3-trichloropropane was estimated with the Estimation Programs Interface for Microsoft® Windows (EPIWIN V3.10, U.S. Environmental Protection Agency, Office of Pollution Prevention and Toxics, Washington, D.C.), Atmospheric Oxidation Program (v1.90) modeling component. Modelling was executed on March 5, 2002. The AOP component of EPIWIN was used to calculate the rate of photodegradation for 1,2,3-trichloropropane. The half-life was calculated to be 30.5 days. There is no absorption of solar radiation by 1,2,3-TCPa in the troposphere. Only indirect photolysis (reaction with OH) occurs. The overall rate constant (KOH) was determined to be 0.3511 x 10-12 cm3/molecule-sec. The half-life of 30.5 days is based on a mean hydroxyl radical concentration of 1.5E6 per cm3 over a 12-hour day.

Description of key information

The modelled half-life for phototransformation in air of 1,2,3-trichloropropane is 30.5 days based on a mean hydroxyl radical concentration of 1.5E6 per cm3 over a 12-hour day.

Key value for chemical safety assessment

Half-life in air:
30.5 d

Additional information

The atmospheric dissipation half-life due to photodegradation of 1,2,3-trichloropropane was estimated with the Estimation Programs Interface for Microsoft® Windows (EPIWIN V3.10, U.S. Environmental Protection Agency, Office of Pollution Prevention and Toxics, Washington, D.C.), Atmospheric Oxidation Program (v1.90) modeling component. Modelling was executed on March 5, 2002. The AOP component of EPIWIN was used to calculate the rate of photodegradation for 1,2,3-trichloropropane. The half-life was calculated to be 30.5 days. There is no absorption of solar radiation by 1,2,3-TCPa in the troposphere. Only indirect photolysis (reaction with OH) occurs. The overall rate constant (KOH) was determined to be 0.3511 x 10-12 cm3/molecule-sec. The half-life of 30.5 days is based on a mean hydroxyl radical concentration of 1.5E6 per cm3 over a 12-hour day.