10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Measurement of the Electrostatic Charging State of Ambient Aerosol Using a Parallel Electrode Plate Device
KENTARO FUJIOKA, Keiichi Kurosowa, Takuto Yonemichi, Koji Fukagata, Tomoaki Okuda, Keio University
Abstract Number: 185 Working Group: Aerosol Physics
Abstract In recent years, the influence on health by fine aerosol particles such as PM2.5 has been concerned. Especially regarding the particle deposition in a human airway, some previous researches showed that charged particles were deposited to airway surface several times as much as uncharged particles. In other words, when we inhale an aerosol particle, it is deposited on the airway more than expected from its particle size if the particles are charged. However, little knowledge on the electrostatic charging state of atmospheric aerosols has been obtained so far. Therefore, in this study, we measured the charging state of atmospheric aerosols from April 2017 using a parallel electrode plate device utilizing the principle of electric mobility. The results varied depending on the measurement day, and the proportion of charged particles was about 75~88%. By investigating the relationship between the charging state and the weather condition at the time of measurement, it was found that there was a strong positive correlation between the proportion of charged particles and the absolute humidity.