A study of the addition pathway of the reaction between DMS and OH
It is generally accepted that the OH initiated oxidation of DMS can proceed through two pathways, either hydrogen abstraction or OH addition to the sulphur atom. This study concentrates on the fate of the DMS-OH adduct. DMSO is identified as an important product in the oxidation of DMS by OH radicals. An interesting result from the investigation of the DMSO-formation is that when NO was in large excess no DMS formation was observed. This may be explained by the presence of a peroxyradical intermediate in the reaction leading to formation of DMSO; the fast reaction of peroxyradicals with NO would then remove this intermediate and possibly prevent the formation of DMSO. Such a radical could be (CH(3))(2)S(OH)OO(.) (I). The hypothesis is that the original adduct (DMS-OH) is in a fast equilibrium with the unstable peroxy-adduct (I) which decomposes to form DMSO and HO(2), but in situations with high [NO] the reaction with NO can compete with the decomposition, preventing the formation of DMSO. The evidence of the formation of this peroxy-adduct (I) is discussed.
Bibliographic Reference: Paper presented: European Geophysical Society, XXth General Assembly, Hamburg (DE), April 3-7, 1995
Availability: Available from (1) as Paper EN 38935 ORA
Record Number: 199510669 / Last updated on: 1995-07-07
Original language: en
Available languages: en