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Environmental fate & pathways

Phototransformation in air

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Description of key information

Key value for chemical safety assessment

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

Additional information

The decomposition rate constant of 1,2-diphenoxyethane (KS-235) in air occurring through reaction with hydroxyl radicals was estimated according to the method of Atkinson using the Atmospheric Oxidation Program (AOPWIN version 1.92, US EPA). This method estimates the rate constant for the atmospheric gas-phase reaction between photochemically produced hydroxyl radicals and organic chemicals and between ozone and olefinic/acetylenic compounds.

 

The decomposition rate constant of KS-235 in air following reaction with hydroxyl radicals was calculated to be 57.0237 x 10-12 cm3 molecule-1 sec-1. Assuming that the 12 hour daytime hydroxyl radical concentration is 1.5 x 106 molecules.cm-3, the half-life was calculated to be 0.188 days (12 hour day).

 

The decomposition rate constant of KS-235 in air following reaction with ozone was not calculated since only olefins and acetylenes are calculated.