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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:
35.74 h

Additional information

Tests on phototransformation in the air are not required to be performed under Annexes VII to X of REACH.

Photooxidation of chloroethylenecan be estimated using a computer model accepted by the US EPA. The Atmospheric Oxidation Program for Microsoft Windows (AOPWIN) is a programme for estimation of indirect photo-oxidation which estimates the rate constant for the atmospheric, gas-phase reaction between photochemically produced hydroxyl radicals and organic chemicals and calculates atmospheric half-lives for organic compounds based upon average atmospheric concentrations of hydroxyl radicals and ozone. Therefore, this model is reliable, adequate and relevant to chloroethylene.

Thus, a half life of 1.937 days is estimated for reaction ofchloroethylenewith hydroxyl radicals in the atmosphere at 25oC [AOPWIN Program, v.1.92].

Overall QSARs estimated half-life for degradation ofchloroethylenein air based upon AOPWIN Model is 35.74 hours.

Based on the data on photochemical degradation ofchloroethylenein the air, it is considered to degrade in the atmosphere via photooxidation process.