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Environmental fate & pathways

Phototransformation in air

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Description of key information

Calculated with AOP Program v1.91 of EPI-Suite the half-life of phthalic acid was 12.7 days related to the atmospheric oxidation (Bayer Industry Services 2004).

Key value for chemical safety assessment

Half-life in air:
12.7 d

Additional information

As no data on phototransfromation in air are available, the rate constant for the atmospheric gas-phase reaction between photochemically produced hydroxyl radicals and organic chemicals is estimated with the Atmospheric Oxidation Program (AOPWIN) of US Environmental Protection Agency. The rate constant is then used to calculate the atmospheric half-life. A 24-hour day and an OH radical conc. of 500,000 OH/cm3 are assumed for calculation.