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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: 38.1565 E-12 cm³/molecules-sec (= 0.000033 cm³/molecules-day) 

Key value for chemical safety assessment

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

Additional information

The phototransformation in air of the substance 2,4,6 -triisopropyl-m-phenylene diisocyanate 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 selected chemical. For the test substance an overall gas-phase reaction constant (also called OH rate constant) of 38.1565 E-12 cm³/molecules-sec (= 0.000033 cm³/molecules-day) and an atmospheric half-life of 0.280 days (around 3.40 hours) was calculated. Neither an ozone reaction nor any nitrate radical reaction is important for the desired chemical.

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.