Kinetics and mechanism of hydroxyl reactions with organic sulfides

Methane sulfonic acid to non‐sea‐salt sulfate ratio in coastal Antarctic aerosol and surface snow

“…' ' ' ' ' ' ' ' --I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I seasonal cycle with winter minima ranging from 5 to 10% and summer maxima from 20 to 30% (Table 1) . Berresheim [1987] suggested that high R values at high latitudes may reflect the temperature dependance of the branching ratio between the OHaddition and the H-abstraction pathway during the initial OH attack on DMS previously suggested by laboratory studies [Hynes et al, 1986]. The assumption of a favored MSA production at lower temperatures implies that the addition pathway, for which all products are not yet known, provides large production of MSA.…”

Gaseous (DMS, MSA, SO<sub>2</sub>, H<sub>2</sub>SO<sub>4</sub> and DMSO) and particulate (sulfate and methanesulfonate) sulfur species over the northeastern coast of Crete

“…where k OH+DMS is taken from Hynes et al (1986) and kcs is the pseudo-first order rate constant for the MSA condensational sink and is derived using two different approaches. The first using the Fuchs-Sutugin equation (Fuchs and Sutugin, 1970) and the second using the k cs derived from H 2 SO 4 but corrected using an accommodation coefficient "α" for MSA equal to 0.075 (De Bruyn et al, 1994) at T=300 K. The second approach is used since aerosol surface data are not available for the whole period.…”

Effects of solar ultraviolet radiation on biogeochemical dynamics in aquatic environments : report of a workshop, Marine Biological Laboratory, Woods Hole, Massachusetts, October 23-26, 1989

“…A paper describing our studies of this key reaction was published about three years ago (Hynes et al, 1986). In the presence of O2, we found that reaction proceeds via a four-step mechanism involving hydrogen abstraction, addition to the sulfur atom, and reaction of the adduct with O2 in competition with adduct dissociation back to reactants.…”

“…Hence, DMS oxidation is a chemical process of central importance in the biogenic sulfur cycle. The atmospheric oxidation of DMS occurs predominantly in the gas phase and is thought to be initiated primarily by reaction with the OH radical (Hynes et al 1986). Other gas phase free radicals which may play an important role as initiators of DMS oxidation include N03 (Atkinson et al, 1984) and 10 (Barnes et al, 1989).…”