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Poster Presentations
Day 1, June 22（Sun.）
Room P (Maesato East, Foyer, Ocean Wing)
- 1P-PM-40
Mass Spectrometry of Dimethyl Sulfide Oxidation Products Formed in Atmospheric Pressure Corona Discharges
(Yokohama City Univ.)
oYuta Hamamoto, Kanako Sekimoto
Dimethyl sulfide (DMS) is a volatile sulfur compound released from the ocean and is known as the scent of the sea. It is oxidized in the atmosphere to form sulfate aerosols, which could prevent global warming. However, the oxidation mechanism of DMS is not fully understood because it depends on many environmental factors. In this study, an atmospheric pressure corona discharge ionization (APCDI) is used to examine the oxidation products of DMS and their formation pathways. DMS is oxidized by corona discharge by-products such as O3 as well as OH and NO3 radicals. In the positive-ion mode, dimethyl sulfoxide (DMSO) and dimethyl sulfone (DMSO2) were identified as DMS oxidation products. In the negative-ion mode, sulfur dioxide (SO2), methanesulfonic acid (MSA), and sulfuric acid (H2SO4) were detected. The type and amount of oxidants formed under different discharge conditions influenced the composition of DMS oxidation products. For example, MSA and H2SO4 were dominant under high and medium electric fields, while SO2 was dominant under low electric fields.