Evaluation of the influence of charging state of atmospheric aerosol on particle deposition on human body and ground surface

• Project/Area Number: 20H00636
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Medium-sized Section 63:Environmental analyses and evaluation and related fields
• Research Institution: Keio University
• Principal Investigator: Okuda Tomoaki 慶應義塾大学, 理工学部(矢上), 教授 (30348809)
• Co-Investigator(Kenkyū-buntansha): 梶野 瑞王 気象庁気象研究所, 全球大気海洋研究部, 主任研究官 (00447939) ; 深潟 康二 慶應義塾大学, 理工学部(矢上), 教授 (80361517) ; 岩田 歩 慶應義塾大学, 理工学部(矢上), 助教 (30827340)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Project Status: Completed (Fiscal Year 2023)
• Budget Amount: ¥45,370,000 (Direct Cost: ¥34,900,000、Indirect Cost: ¥10,470,000); Fiscal Year 2023: ¥8,970,000 (Direct Cost: ¥6,900,000、Indirect Cost: ¥2,070,000); Fiscal Year 2022: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000); Fiscal Year 2021: ¥10,920,000 (Direct Cost: ¥8,400,000、Indirect Cost: ¥2,520,000); Fiscal Year 2020: ¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
• Keywords: エアロゾル / 帯電粒子 / 沈着 / 呼吸器 / 地表面 / フィールド調査 / シミュレーション / 帯電状態 / 生体影響

Outline of Research at the Start

有害性が懸念されるエアロゾル粒子の生体や地表面への沈着挙動を議論する上で、粒子の沈着現象に関わる重要なパラメータである粒子の帯電状態については、ほとんど研究が進んでいない。本研究では、生体や地表面へのエアロゾル粒子の沈着現象において、粒子のサイズや粒径分布および幾何学的形状等のパラメータ群と比較して、実環境大気エアロゾルの帯電状態がどの程度の影響を持つか、という問いに対して、観測と実験およびシミュレーションモデルの手法を駆使して明らかにすることを目指す。

Outline of Final Research Achievements

We aim to clarify (1) the particle charging state and its controlling factors in ambient air, (2) the effect of particle charging state on particle deposition on living organisms, and (3) the effect of particle charging state on particle deposition on ground surfaces, respectively, which are not well known and should be understood when discussing the deposition behavior of aerosol particles. The results showed that (a) KPFM can measure the charging state of individual particles, (b) radioactive Cs particles have a larger negative charge number than non-radioactive particles, (c) the number fraction of non-charged particles may be strongly affected by the negative ion concentration and water vapor content in the ambient air, and (d) the quality of the deposition simulation may be improved by taking into account the measured charging state of the particles.

Academic Significance and Societal Importance of the Research Achievements

エアロゾル粒子の生体や地表面への沈着挙動に関連する粒子特性のうち、サイズ分布や形状および化学組成等に関しては多くの知見が蓄積されてきたが、粒子の帯電状態についてはほとんど研究が進んでいなかった。本研究の成果により、単一粒子または空気中の粒子群の帯電状態を計測できるようになったことに加え、放射性粒子が非放射性粒子よりも生体や地表面に多く沈着する可能性があること、大気中の粒子の帯電状態が気象条件とくに水蒸気量によって変化し得ること、粒子の帯電状態の違いにより生体への沈着量が変化し得ること、粒子帯電を考慮することで沈着シミュレーション結果の質が向上する可能性があること、等を示すことができた。

Research Products

• [Int'l Joint Research] Uzbek-Japan Innovation Center of Youth/Tashkent State Technical University(ウズベキスタン)
• [Int'l Joint Research] CSIR-National Physical Laboratory, India(インド)
• [Int'l Joint Research] 西安交通大学(中国)
• [Journal Article] Numerical simulation of IL-8-based relative inflammation potentials of aerosol particles from vehicle exhaust and non-exhaust emission sources in Japan (2024)
  • Author(s): Kajino Mizuo、Kayaba Satoko、Ishihara Yasuhiro、Iwamoto Yoko、Okuda Tomoaki、Okochi Hiroshi
  • Journal Title: Atmospheric Environment: X Volume: 21 Pages: 100237-100237
  • DOI: 10.1016/j.aeaoa.2024.100237
  • Peer Reviewed / Open Access
• [Journal Article] Key Factors Controlling Number Concentrations of Non-charged Particles: An Experimental Study (2024)
  • Author(s): Mori Tatsuhiro、Iwata Ayumi、Tabata Ryoya、Okuda Tomoaki
  • Journal Title: Aerosol and Air Quality Research Volume: 24 Issue: 4 Pages: 220382-220382
  • DOI: 10.4209/aaqr.220382
  • Peer Reviewed / Open Access
• [Journal Article] Seasonal charge distributions of submicron atmospheric particles in Yokohama, Japan (2024)
  • Author(s): Mori Tatsuhiro、Ishii Yuto、Iwata Ayumi、Okuda Tomoaki
  • Journal Title: Atmospheric Environment Volume: 324 Pages: 120421-120421
  • DOI: 10.1016/j.atmosenv.2024.120421
  • Peer Reviewed / Open Access
• [Journal Article] Technique for estimating the charge number of individual radioactive particles using Kelvin probe force microscopy (2023)
  • Author(s): Shinke Yukimi、Mori Tatsuhiro、Iwata Ayumi、Mohd Nor Muhammad Aiman bin、Kurosawa Keiichi、Inagaki Makoto、Sekimoto Shun、Takamiya Koichi、Oki Yuichi、Ohtsuki Tsutomu、Igarashi Yasuhito、Okuda Tomoaki
  • Journal Title: Aerosol Science and Technology Volume: 57 Issue: 8 Pages: 758-768
  • DOI: 10.1080/02786826.2023.2221726
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Quantitative influences of interannual variations in meteorological factors on surface ozone concentration in the hot summer of 2018 in Japan (2022)
  • Author(s): Kajino, M., A. Kamada, N. Tanji, M. Kuramochi, M. Deushi, and T. Maki
  • Journal Title: Atmos. Environ: X Volume: 16 Pages: 100191-100191
  • DOI: 10.1016/j.aeaoa.2022.100191
  • Peer Reviewed / Open Access
• [Journal Article] Reassessment of the radiocesium resuspension flux from contaminated ground surfaces in eastern Japan (2022)
  • Author(s): Kajino Mizuo、Watanabe Akira、Ishizuka Masahide、Kita Kazuyuki、Zaizen Yuji、Kinase Takeshi、Hirai Rikuya、Konnai Kakeru、Saya Akane、Iwaoka Kazuki、Shiroma Yoshitaka、Hasegawa Hidenao、Akata Naofumi、Hosoda Masahiro、Tokonami Shinji、Igarashi Yasuhito
  • Journal Title: Atmospheric Chemistry and Physics Volume: 22 Issue: 2 Pages: 783-803
  • DOI: 10.5194/acp-22-783-2022
  • Peer Reviewed / Open Access
• [Journal Article] Contribution of Physical and Chemical Properties to Dithiothreitol-Measured Oxidative Potentials of Atmospheric Aerosol Particles at Urban and Rural Sites in Japan (2022)
  • Author(s): Kurihara Kazuki、Iwata Ayumi、Murray Horwitz Samuel Gray、Ogane Kako、Sugioka Tomoki、Matsuki Atsushi、Okuda Tomoaki
  • Journal Title: Atmosphere Volume: 13 Issue: 2 Pages: 319-319
  • DOI: 10.3390/atmos13020319
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Characterization of Elemental Composition and Valence State of Cyclone-collected Aerosol Particles Using EDXRF and XAFS at Three Sites in Japan (2022)
  • Author(s): Jing Weidong、Saito Katsutomo、Okamoto Takuma、Saito Hibiki、Sugimoto Kazuki、Nishita-Hara Chiharu、Hara Keiichiro、Hayashi Masahiko、Hasegawa Shuichi、Okuda Tomoaki
  • Journal Title: Asian Journal of Atmospheric Environment Volume: 16 Issue: 2 Pages: 27-45
  • DOI: 10.5572/ajae.2021.137
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Comparison of three aerosol representations of NHM-Chem (v1.0) for the simulations of air quality and climate-relevant variables. (2021)
  • Author(s): Kajino, M., Deushi, M., Sekitama, T., T., Oshima, N., Yumimoto, K., Tanaka, T., Y., Ching, J., Hashimoto, A., Yamamoto, T., Ikegami, M., Kamada, A., Miyashita, M., Inomata, Y., Shima, S., Khatri, P., Shimizu, A., Irie, H., Adachi, K., Zaizen, Y., Igarashi, Y., Ueda, H., Maki, T., Mikami, M,
  • Journal Title: Geoscientific Model Development Volume: 14 Issue: 4 Pages: 2235-2264
  • DOI: 10.5194/gmd-14-2235-2021
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Lung deposited surface area of atmospheric aerosol particles at three observatories in Japan (2021)
  • Author(s): Kurihara Kazuki、Iwata Ayumi、Kiriya Miho、Yoshino Ayako、Takami Akinori、Matsuki Atsushi、Nishita-Hara Chiharu、Hara Keiichiro、Hayashi Masahiko、Kaneyasu Naoki、Seto Takafumi、Fujitani Yuji、Funato Koji、Inoue Kozo、Okuda Tomoaki
  • Journal Title: Atmospheric Environment Volume: 262 Pages: 118597-118597
  • DOI: 10.1016/j.atmosenv.2021.118597
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Development of A Low-Cost Simultaneous Low Volume Air Sampler Controlled with Sonic Venturi (2021)
  • Author(s): Alimov Zikrilla Bobamuratovich、Kusakari Hikaru、Okuda Tomoaki
  • Journal Title: Asian Journal of Atmospheric Environment Volume: 15 Issue: 1 Pages: 52-67
  • DOI: 10.5572/ajae.2020.072
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Theoretical and field evaluation of a PM2.5 high-volume impactor inlet design (2021)
  • Author(s): Patel Prashant、Aggarwal Shankar G.、Tsai Chuen-Jinn、Okuda Tomoaki
  • Journal Title: Atmospheric Environment Volume: 244 Pages: 117811-117811
  • DOI: 10.1016/j.atmosenv.2020.117811
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Deposition and Dispersion of Radio‐Cesium Released due to the Fukushima Nuclear Accident: 2. Sensitivity to Aerosol Microphysical Properties of Cs‐Bearing Microparticles (CsMPs) (2021)
  • Author(s): Kajino Mizuo、Adachi Kouji、Igarashi Yasuhito、Satou Yukihiko、Sawada Morihiro、Thomas Sekiyama Tsuyoshi、Zaizen Yuji、Saya Akane、Tsuruta Haruo、Moriguchi Yuichi
  • Journal Title: Journal of Geophysical Research: Atmospheres Volume: 126 Issue: 1 Pages: 1-1
  • DOI: 10.1029/2020jd033460
  • Peer Reviewed / Open Access
• [Journal Article] Simulation of the transition metal based cumulative oxidative potential in East Asia and its emission sources in Japan (2021)
  • Author(s): Mizuo Kajino, Hiroyuki Hagino, Yuji Fujitani, Tazuko Morikawa, Tetsuo Fukui, Kazunari Onishi, Tomoaki Okuda & Yasuhito Igarashi
  • Journal Title: Scientific reports Volume: 11 Issue: 1 Pages: 6550-6550
  • DOI: 10.1038/s41598-021-85894-z
  • NAID: 120007017209
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Modeling Transition Metals in East Asia and Japan and Its Emission Sources. (2020)
  • Author(s): Mizuo Kajino, Hiroyuki Hagino, Yuji Fujitani, Tazuko Morikawa, Tetsuo Fukui, Kazunari Onishi, Tomoaki Okuda, Tomoki Kajikawa, Yasuhito Igarashi.
  • Journal Title: GeoHealth Volume: 4-9 Issue: 9 Pages: 1-1
  • DOI: 10.1029/2020gh000259
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] エアロゾル粒子の肺内輸送現象の解析 (2023)
  • Author(s): 三谷亮介、大﨑修司、仲村英也、綿野哲、Muhammad Aiman Mohd Nor、森樹大、奥田知明
  • Organizer: 混相流シンポジウム2023、北海道大学、北海道札幌市
• [Presentation] 実環境大気中サブミクロンエアロゾル粒子の帯電状態の測定 (2023)
  • Author(s): 奥田知明
  • Organizer: 第40回エアロゾル科学・技術研究討論会、美喜仁桐生文化会館、群馬県桐生市
  • Invited
• [Presentation] 粉末吸入製剤における帯電による粒子残留現象の解明 (2023)
  • Author(s): 三谷亮介、飯沼拓人、大﨑修司、仲村英也、綿野哲、Muhammad Aiman Mohd Nor、森樹大、奥田知明
  • Organizer: 第40回エアロゾル科学・技術研究討論会、美喜仁桐生文化会館、群馬県桐生市
• [Presentation] 横浜、能登における氷晶核粒子濃度に対する粒子組成および熱感受性生物起源粒子の寄与 (2023)
  • Author(s): 岩田歩、Samuel Gray MURRAY HORWITZ、栗原一嘉、松木篤、奥田知明
  • Organizer: 第64回大気環境学会年会、国立研究開発法人産業技術総合研究所 つくばセンター 共用講堂、茨城県つくば市
• [Presentation] 都市域における帯電粒子の数濃度分布の季節変化 (2023)
  • Author(s): 森樹大、石井悠人、岩田歩、奥田知明
  • Organizer: 第64回大気環境学会年会、国立研究開発法人産業技術総合研究所 つくばセンター 共用講堂、茨城県つくば市
• [Presentation] 粉末吸入製剤における粒子帯電現象の解明 (2023)
  • Author(s): 三谷亮介、飯沼拓人、Muhammad Aiman Mohd Nor、森樹大、奥田知明
  • Organizer: 粉体工学会2023年度秋期研究発表会、インテックス大阪、大阪府大阪市
• [Presentation] 帯電性粒子の肺内沈着挙動の数値解析 (2023)
  • Author(s): 三谷亮介、飯沼拓人、Muhammad Aiman Mohd Nor、森樹大、奥田知明
  • Organizer: 化学工学会第89回年会、大阪公立大学、大阪府堺市
• [Presentation] Observation of atmospheric particle electrostatic charging states in urban and rural regions (2022)
  • Author(s): Ishii, Y., Mori, T., Iwata, A., Miki, K., Matsuki, A., Okuda, T.
  • Organizer: American Association for Aerosol Research 40th Annual Conference
  • Int'l Joint Research
• [Presentation] Investigation of the charging state of radioactive Cs particles using kelvin probe force microscopy (2022)
  • Author(s): Shinke, Y., Mori, T., Iwata, A., Kurosawa, K., Inagaki, M., Sekimoto, S., Takamiya, K., Oki, Y., Ohtsuki, T., Igarashi, Y., Okuda, T.
  • Organizer: American Association for Aerosol Research 40th Annual Conference
  • Int'l Joint Research
• [Presentation] 粒子沈着評価装置におけるPM2.5挙動の数値シミュレーション (2022)
  • Author(s): 藤間 葉子，難波江 佑介，岩田 歩，石戸谷 澪，奥田 知明，深潟 康二
  • Organizer: 日本流体力学会年会2022
• [Presentation] KPFM法を用いた個別粒子の帯電状態解明方法の検討 (2022)
  • Author(s): 新家雪実、岩田歩、黒澤景一、森樹大、奥田知明
  • Organizer: 第39回エアロゾル科学・技術研究討論会
• [Presentation] Numerical simulations of fine particles issued into containers (2022)
  • Author(s): 藤間葉子，矢島康太郎，新井梨乃，難波江佑介，深潟康二
  • Organizer: 第25回乱流制御研究会
• [Presentation] エアロゾル粒子の気道模型に対する沈着率の検証 (2021)
  • Author(s): 石戸谷澪、岩田歩、奥田知明
  • Organizer: 第62回大気環境学会年会
• [Presentation] 放射性物質の輸送・沈着モデルの進化と有用性 (2021)
  • Author(s): 梶野瑞王、森野悠
  • Organizer: 東京電力福島第一原子力発電所事故による放射能大気環境汚染 ―これまでとこれから―
  • Invited
• [Presentation] Deposition, dispersion, and re-suspension of radiocesium in East Japan (2021)
  • Author(s): Kajino, M., et al.
  • Organizer: Fukushima and the Ocean
  • Int'l Joint Research
• [Presentation] 乱流場におけるPM2.5 の壁面への沈着挙動の数値モデリング (2021)
  • Author(s): 藤間 葉子，新井 梨乃，難波江 佑介，深潟 康二
  • Organizer: 日本機械学会関東学生会第60回学生員卒業研究発表講演会
• [Presentation] Relationship between electrostatic charging variations of atmospheric sub-micron particles and meteorological condition (2020)
  • Author(s): Iwata, A., Tabata, R., Fujioka, K., Yonemichi, T., Fukagata, K., Okuda, T.
  • Organizer: European Aerosol Conference 2020
  • Int'l Joint Research
• [Presentation] Measurement of the electrostatic charging state of combustion particle using Tandem DMA (2020)
  • Author(s): Muramatsu, R., Iwata, A., Okuda, T.
  • Organizer: European Aerosol Conference 2020
  • Int'l Joint Research
• [Remarks]
  • URL: https://www.applc.keio.ac.jp/~okuda/research/theme/charge.html
• [Remarks] 慶應義塾大学 理工学部 応用化学科 環境化学研究室：粒子の帯電状態
  • URL: https://www.applc.keio.ac.jp/~okuda/research/theme/charge.html