Registration Dossier

Environmental fate & pathways

Phototransformation in air

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Description of key information

Calculation with AOPWIN v1.92 (EPIWIN software by US-EPA), overall gas-phase reaction constant: 280.7565 E-12 cm³/molecules-sec (= 0.000024257 cm³/molecules-day) 

Key value for chemical safety assessment

Half-life in air:
27.43 min
Degradation rate constant with OH radicals:
0 cm³ molecule-1 d-1

Additional information

The phototransformation in air of the test substance was determined by the computer program AOPWIN v1.92 (EPIWIN software) by US-EPA (Chemservice S.A., 2011). The program estimates the gas-phase reaction rate for the reaction between the most prevalent atmospheric oxidant (hydroxyl radicals) and the chemical. For the test substance an overall gas-phase reaction constant (also called OH rate constant) of 280.7565 E-12 cm³/molecules-sec (= 0.000024257 cm³/molecules-day) and an atmospheric half-life of 27.43 minutes was calculated. Neither an ozone reaction nor any nitrate radical reaction is important for this substance. No GLP criteria are applicable for the usage of this tool, but due to the fact that it is a scientifically accepted calculation method the estimations performed are reliable with restrictions and can be used for the chemical safety assessment.