Kinetics of the Gas-Phase Reactions of Dibenzothiophene with OH Radicals, NO3 Radicals, and O3

Abstract

The kinetics of the gas-phase reactions of OH radicals, NO3 radicals and O3 with dibenzothiophene have been studied at 297 ± 2 K and atmospheric pressure of air. An upper limit to the rate constant for the O3 reaction of >6 × 10−19 cm3 molecule−1 s−1 was obtained, and using a relative rate method a rate constant for the OH radical reaction of (8.1 ± 2.6) × 10−12 cm3 molecule−1 s−1 was measured. The measured rate constant for the NO3 radical reaction increased with increasing NO2 concentration, with a rate constant at low NO2 concentrations representative of the ambient atmosphere of > 7 × 10−14 cm3 molecule−1 s−1 being measured. Nitrodibenzothiophenes were observed as minor products of the OH radical and NO3 radical reactions in the presence of NO2.