フローリアクタを用いた低濃度SO_2からの粒子生成と生成物の化学組成

概要

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Aerosol formation via a reaction from low concentration SO2 (sub-ppm level) was carried out using a flow-type reactor and the change in gaseous species was simulated by a numerical calculation. Particle generation was observed when 248 nm laser beam was irradiated to the gas mixture containing SO2, O3 and H2O vapor. The amount of SO2 was reduced by 21 % at initial concentrations of SO2 = 179 ppb and OH = 183 ppb, and the number concentration of generated particles ranged from 6 × 106 to 9 × 106 cm -3. The generated particles were less than 100 nm in diameter and SO42- concentration was 70 wt% at the first stage of nucleation, which decreased rapidly to less than 10 wt%. Sulfuric acid molecules were detected as a precursor of nucleation by a mass spectrometer. It was suggested that sulfuric acid molecules efficiently attracted not only water molecules but also water clusters and small water droplets during the gas-to-particle nucleation process.
日本エアロゾル学会の論文
2000-09-20