J. Phys. IV France
Volume 107, May 2003
Page(s) 1119 - 1121

J. Phys. IV France
107 (2003) 1119
DOI: 10.1051/jp4:20030497

Kinetics and products study of the reaction of BrO radicals with gaseous mercury

F. Raofie and P.A. Ariya

Departments of Chemistry and Atmospheric and Oceanic Sciences, McGill University, Montréal, Québec H3A 2K6, Canada

Bro reactions of elemental mercury was as a major candidate for near complete depletion of elemental mercury in polar region. The kinetics of the reaction between BrO radicals with gaseous mercury was identified using relative rate method by Gas Chromatography with Mass spectroscopic Detection (GC-MS) at room temperature ( $298\pm1$ K) and at atmospheric pressure $760 \pm 1$ Torr in the N2 diluent. Propane, DMS and butane were used as reference molecules. The upper and lower limits rate constant for reaction of $\rm Hg^0$ with BrO was estimated to be $1.0 \times 10^{-13}$ and $1.0 \times 10^{15}$ cm 3 molecules -1 s -1, respectively. BrO radicals were produced from the photolysis of bromine and dibromomethane in presence of ozone and detected by MS at $\rm m/e = 95$ or 97. Ozone was produced in a Silent discharged generator. Reaction products were identified using direct mass spectrometer with chemical ionization ion source.

© EDP Sciences 2003