Registration Dossier

Environmental fate & pathways

Phototransformation in air

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Description of key information

Tetrachloroethylene undergoes reactions with hydroxyl radicals in the atmosphere. The half-life of tetrachloroethylene due to this reaction, based on a 12-hr day w ith a OH radical concentartion of 1.5E6 OH/cm3 is 50 days.

Key value for chemical safety assessment

Half-life in air:
50 d

Additional information

Tetrachloroethylene undergoes reactions with hydroxyl radicals in the atmosphere. The calculated half life of tetrachloroethylene due to this reaction is 50 days with a OH radical concentration of 1.5E6 OH/cm3 (AOPWIN, 2000), with an overall OH-rate constant of 2.14E-13cm3/molecule.sec. Tetrachloroethylene also reacts with ozone, nitrate radicals and hydroperoxy radicals in the atmosphere but are thought to be insignificant atmospheric degradation processes. Tetrachloroethylene can also react with chlorine atoms in the atmosphere. Overall, tetrachloroethylene is degraded in the atmosphere.