Ozone kinetics of dimethyl sulfide in the presence of water vapor

The outdoor smog chamber was used to thorough investigate the rate constants of gas-phase reaction between dimethyl sulfide (DMS) and ozone (O-3) under conditions of relative humidity 55.0%-67.8% at (296 +/- 2)K for the first time. The rate constants were measured, at a total pressure of 1 atm, to be (10.4 +/- 0.2) +/- 10(-19) cm(3.)molecule(-1.)s(-1) at relative humidity of 67.5%+/- 0.3% at 298K, (10.1 +/- 0.1) +/- 10(-19) cm(3.)molecule(-1.)s(-1) at relative humidity of 66.5%+/- 0.5% at 296K, (7.75 +/- 0.39) +/- 10(-19) cm(3.)molecule(-1.)s(-1)at relative humidity of 64.8%+/- 0.1% at 294K and (3.42 +/- 0.21) +/- 10(-19) cm(3.)molecule-1.s(-1)at relative humidity of 55.8%+/- 0.8% at 295K. Base on these results, it is possible to see the reaction of O-3/DMS in the presence of water vapor as an important sink for DMS in the earth atmosphere.