Poster Presentations
Day 2, June 11（Thu.） Room P (5F 501+502)
- 2P-08（3D-O1-0933）
Hierarchical Clustering Analysis of Dimethyl Sulfide Oxidation Pathways under Atmospheric Pressure Corona Discharges
(Yokohama City Univ.)
oYuta Hamamoto, Kanako Sekimoto
Dimethyl sulfide (DMS) released by marine organisms is oxidized in the atmosphere and can form sulfate aerosols, which affect cloud condensation nuclei and climate. Atmospheric pressure corona discharge ionization (APCDI), in which oxidation and ionization can proceed simultaneously, was used to track DMS-derived ions in real time under ambient conditions. Under positive and negative corona discharges, ion peaks corresponding to dimethyl sulfoxide (DMSO), methanesulfonic acid (MSA), and sulfuric acid (H2SO4) were observed. Hierarchical clustering of temporal ion profiles reproducibly separated the ions into distinct groups, suggesting shared precursors or reaction pathways within the dataset. In positive-ion mode, nitrogen-containing ions formed a characteristic cluster, suggesting that reactive nitrogen species participate in DMS oxidation within the discharge field.