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Environmental fate & pathways

Phototransformation in air

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phototransformation in air
Type of information:
calculation (if not (Q)SAR)
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Principles of method if other than guideline:
calculated using EPI Suite Version 4.11
GLP compliance:
Estimation method (if used):
PHOTOCHEMICAL REACTION WITH OH RADICALS- Concentration of OH radicals: 500000- Degradation rate constant: 0.00000000001747 cm³/molecule-sec- Temperature for which rate constant was calculated: 25 °C- Computer programme: SRC AOP v1.92 - Calculated t 1/2 is based on a 24 h day
22.03 h
The calculated half-life for phototransformation of cyclohexanol in air is 22.03 hours.
Executive summary:

The phototransformation of cyclohexanol in air was predicted with the software tool SRC AOP v1.92. This calculation resulted in a half-life of 22.03 hours.

Description of key information

DT50 = 22.03 hours (EPISUITE calculation, 2017)

Key value for chemical safety assessment

Half-life in air:
22.03 h

Additional information

A calculation using AOP v1.92 was performed for the estimation of the indirect photodegradation in the atmosphere. For this calculation a 24-hour day as well as a sensitizer-concentration (OH-radicals) of 500,000 molecules/cm³ were assumed. The calculated rate constant is 0.00000000001747 cm³/molecule/sec corresponding to an estimated half-life in the troposphere of 22.03 hours. After evaporation or exposure to the air, the product will be rapidly degraded by photochemical processes.