TY - JOUR

T1 - Kinetics and mechanism of the oxidation of dimethylsulfoxide (DMSO) and methanesulfinate (MSI-) by OH radicals in aqueous medium

AU - Bardouki, H.

AU - Barcellos Da Rosa, Marcelo

AU - Mihalopoulos, Nikos

AU - Palm, Wolf-Ulrich

AU - Zetzsch, Cornelius

N1 - Funding Information: We thank the European Commission, DOMAC (ENV4-CT97-0410) and EL-CID (ENK2-CT-1999-00033) projects for financial support and M. Kanakidou and an unknown reviewer for helpful remarks. M. Barcellos da Rossa thanks the DAAD for a stipend.

PY - 2002/10/1

Y1 - 2002/10/1

N2 - Kinetics and product distribution of the reaction of dimethylsulfoxide (DMSO) and methanesulfinate (MSI -) with OH radicals and H 2O 2 in the aqueous phase are reported in this work. DMSO is found to be very stable in pure water or in solutions containing H 2O 2. On the other hand, it reacts very rapidly (k=4.5×10 9M -1s -1) with OH radicals. MSI - has been identified as the main intermediate product, while methanesulfonate (MS -) and sulfate were the final products due to the very fast reaction of MSI - with OH radicals (k=1.2×10 10M -1s -1). MS - has been identified as the major end product (yield higher than 95%) of both DMSO and MSI - reactions by OH radicals in aqueous solutions. The potential implications of these reactions for the biogenic sulfur cycle in the atmosphere are presented and discussed.

AB - Kinetics and product distribution of the reaction of dimethylsulfoxide (DMSO) and methanesulfinate (MSI -) with OH radicals and H 2O 2 in the aqueous phase are reported in this work. DMSO is found to be very stable in pure water or in solutions containing H 2O 2. On the other hand, it reacts very rapidly (k=4.5×10 9M -1s -1) with OH radicals. MSI - has been identified as the main intermediate product, while methanesulfonate (MS -) and sulfate were the final products due to the very fast reaction of MSI - with OH radicals (k=1.2×10 10M -1s -1). MS - has been identified as the major end product (yield higher than 95%) of both DMSO and MSI - reactions by OH radicals in aqueous solutions. The potential implications of these reactions for the biogenic sulfur cycle in the atmosphere are presented and discussed.

KW - Chemistry

KW - Sulfur cycle

KW - Photo-oxidation

KW - Heterogeneous reactions

KW - DMS

KW - DMSO

KW - MSIA

KW - MSA

KW - OH

UR - http://www.scopus.com/inward/record.url?scp=0346460947&partnerID=8YFLogxK

U2 - 10.1016/S1352-2310(02)00460-0

DO - 10.1016/S1352-2310(02)00460-0

M3 - Journal articles

VL - 36

SP - 4627

EP - 4634

JO - Atmospheric Environment

JF - Atmospheric Environment

SN - 1352-2310

IS - 29

ER -