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Environmental fate & pathways

Phototransformation in air

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The photodegradation of m- and p-diisopropylbenzene in air by reaction with OH radicals was calculated using EPIWIN v3.20, AOPWIN v1.92. Based on the reaction rate constants k(OH)= 15.524 x 10E-12 cm³/molecule x sec (m-diisopropylbenzene) and k(OH)= 10.1158 x 10E-12 cm³/molecule x sec (p-diisopropylbenzene) and assuming a OH radical concentration of 5 x 10E5 radicals/cm³ (24 h d) half-lives of 24.8 h (m-diisopropylbenzene) and 38.07 h (p-diisopropylbenzene) were calculated. For m-diisopropylbenzene a half-life of 8.268 hours was calculated based on the aforementioned rate constant and assuming a hydroxyl radical concentration in the atmosphere of 1.5E6 OH/cm3 (12 h day); accordingly a half-life time of 12.688 hours was calculated for p-diisopropylbenzene based on the above cited rate constant and assuming a hydroxyl radical concentration in the atmosphere of 1.5E6 OH/cm3 (12 h day).

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data obtained via a generally accepted calculation method