Okuda, Tomoaki

写真a

Affiliation

Faculty of Science and Technology, Department of Applied Chemistry (Yagami)

Position

Professor

E-mail Address

E-mail address

Related Websites

External Links

Profile Summary 【 Display / hide

  • Study on physical and chemical characteristics of atmospheric particulate matter (PM2.5) associated with health hazard

Career 【 Display / hide

  • 2020.04
    -
    Present

    理工学部応用化学科, 大学教授

  • 2015.04
    -
    2020.03

    理工学部応用化学科, 大学准教授

  • 2007.10
    -
    2008.09

    University of Wisconson-Madison, USA, Visiting Assistant Professor

  • 2007.04
    -
    2015.03

    理工学部応用化学科, 大学専任講師

  • 2002.04
    -
    2007.03

    理工学部応用化学科, 大学助手

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Academic Background 【 Display / hide

  • 1999.04
    -
    2002.03

    Tokyo University of Agriculture and Technology, Graduate School, Division of Agricltural Sciences

    Graduate School, Completed, Doctoral course

  • 1997.04
    -
    1999.03

    Tokyo Metropolitan University, Graduate School, Division of Natural Science, Department of Chemistry

    Graduate School, Completed, Master's course

  • 1993.04
    -
    1997.03

    Tokyo Metropolitan University, Faculty of Science, Department of Chemistry

    University, Graduated

Academic Degrees 【 Display / hide

  • Doctor (Agricultural Science), Tokyo University of Agriculture and Technology, Coursework, 2002.03

 

Research Areas 【 Display / hide

  • Environmental dynamic analysis (Environmental Dynamic Analysis)

  • Green/Environmental chemistry (Environmental Chemistry)

  • Geochemistry/Cosmochemistry (Earth Astrohemistry)

  • Properties in chemical engineering process/Transfer operation/Unit operation

Research Keywords 【 Display / hide

  • aerosol, PM2.5, fine particulate matter, physical and chemical characteristics, health impacts

 

Books 【 Display / hide

  • 環境化学

    OKUDA TOMOAKI, 日本有機地球化学会, 2014

    Scope: 日本地球化学会(監修)地球・環境有機分子質量分析マニュアル2014,第1部第5章

  • Aerosol Pollution in China

    OKUDA TOMOAKI, TANAKA SHIGERU, HE KEBIN, MA YONGLIANG, 京都大学学術出版会、京都, 2007

    Scope: 24-32

Papers 【 Display / hide

  • Theoretical and field evaluation of a PM<inf>2.5</inf> high-volume impactor inlet design

    Patel P., Aggarwal S.G., Tsai C.J., Okuda T.

    Atmospheric Environment (Atmospheric Environment)  244 2021.01

    ISSN  13522310

     View Summary

    © 2020 A PM2.5 high-volume impactor (HVI) sampler is developed, which has a flow rate of 1130 L per minute (lpm) (1.13 m3/min) and in it, the filter size used is of 8 inch × 10 inch. The major advantages of this sampler as compared to other low-volume sampler (flow rate 16.67 lpm) are lower uncertainty in mass measurement, higher PM2.5 mass collection and lesser sampling time. To develop this PM2.5 HVI sampler, a series of simulation and experimental studies were carried out. The optimized D50 cutoff size of 2.52 μm was obtained experimentally under real ambient conditions (i.e. with polydisperse ambient particles) after the parametric adjustments. The commercial PM2.5 HV sampler cutoff size was also evaluated experimentally, and agreed well to the D50 cutoff size of developed PM2.5 HVI sampler. Field performance studies of developed PM2.5 HVI sampler were also carried out under both high- and low- particle mass loading conditions along with commercial PM2.5 high- and low-volume samplers. The developed PM2.5 HVI sampler agreed well with commercial PM2.5 high- and low-volume samplers, i.e. PM2.5 HVS, BAM and WINS reference sampler in mass measurement with mean deviations of 12.7, 18.5 and 11.7 μg/m3 (i.e. 5.05, 4.86 and 3.70%), respectively under tested conditions. This PM2.5 HVI sampler is very useful especially where the extensive offline chemical analysis of filter samples/high amount of particulate material is needed for source apportionment studies or analysis of bioassay or toxicological purposes (in vitro/in vivo studies), diurnal studies, and air sampling where the mass concentration of particles is very low, e.g. marine, polar regions, most of the rural sites, etc.

  • Modeling Transition Metals in East Asia and Japan and Its Emission Sources

    Kajino M., Hagino H., Fujitani Y., Morikawa T., Fukui T., Onishi K., Okuda T., Kajikawa T., Igarashi Y.

    GeoHealth (GeoHealth)  4 ( 9 )  2020.09

     View Summary

    © 2020. The Authors. Emission inventories of anthropogenic transition metals, which contribute to aerosol oxidative potential (OP), in Asia (Δx = 0.25°, monthly, 2000–2008) and Japan (Δx = 2 km, hourly, mainly 2012) were developed, based on bottom-up inventories of particulate matters and metal profiles in a speciation database for particulate matters. The new inventories are named Transition Metal Inventory (TMI)-Asia v1.0 and TMI-Japan v1.0, respectively. It includes 10 transition metals in PM2.5 and PM10, which contributed to OP based on reagent experiments, namely, Cu, Mn, Co, V, Ni, Pb, Fe, Zn, Cd, and Cr. The contributions of sectors in the transition metals emission in Japan were also investigated. Road brakes and iron-steel industry are primary sources, followed by other metal industry, navigation, incineration, power plants, and railway. In order to validate the emission inventory, eight elements such as Cu, Mn, V, Ni, Pb, Fe, Zn, and Cr in anthropogenic dust and those in mineral dust were simulated over East Asia and Japan with Δx = 30 km and Δx = 5 km domains, respectively, and compared against the nation-wide seasonal observations of PM2.5 elements in Japan and the long-term continuous observations of total suspended particles (TSPs) at Yonago, Japan in 2013. Most of the simulated elements generally agreed with the observations, while Cu and Pb were significantly overestimated. This is the first comprehensive study on the development and evaluation of emission inventory of OP active elements, but further improvement is needed.

  • Charging states on atmospheric aerosol particles affected by meteorological conditions

    He Y., Gu Z., Lu W., Zhang L., Zhang D., Okuda T., Yu C.

    Particuology (Particuology)  52   1 - 9 2020

    ISSN  16742001

     View Summary

    © 2020 Previous studies on haze formation focused mainly on the various chemical components in aerosol particles and their physicochemical effects on particle behaviour (e.g., generation, growth, and agglomeration). This paper describes the measurement of the charging state on atmospheric aerosol particles, which could be affected by meteorological conditions. A series of experiments on particle charging state and meteorological factors was undertaken on the roof of the west 4th building on the Qujiang Campus at Xi'an Jiaotong University (China). Measurements were conducted approximately 20 m above ground level. Our results showed that most atmospheric particles carried net negative or positive charge and that the electric charge on the particles varied diurnally and seasonally. The average amount of charge on particles was higher in winter than in summer. The number concentration of charged particles was higher during the day than overnight. Obvious difference in the average charge of aerosol particles was found between sand–dust days and haze days. A strong relationship was found between the PM2.5 concentration, charge amount on particles, and humidity. Our findings show that particle formation and growth could partly be attributed to variation in particle charging state, which is related to meteorological conditions including atmospheric humidity.

  • Effects of ambient PM<inf>2.5</inf> collected using cyclonic separator from Asian cities on human airway epithelial cells

    Chowdhury P., Honda A., Ito S., Okano H., Onishi T., Higashihara M., Okuda T., Tanaka T., Hirai S., Takano H.

    Aerosol and Air Quality Research (Aerosol and Air Quality Research)  19 ( 8 ) 1808 - 1819 2019.08

    ISSN  16808584

     View Summary

    © Taiwan Association for Aerosol Research. Recent studies have shown that air pollution is intense and hazardous in Asia compared to other parts of the world due to the late and poor implementation of updated technology in automobiles and industry as well as to the high population density. Respiratory disease, including asthma, is exacerbated by air pollution. However, the effects of PM2.5, especially on respiratory allergies in Asian cities, have not yet been examined in detail. In this study, airway epithelial cells were exposed to crude PM2.5 particles collected by cyclonic separation from three different Asian cities, namely, Sakai, Bangkok, and Taipei. We compared the cytotoxicity and inflammatory potential of the PM2.5 from these cities by measuring IL-6 and IL-8. The samples from Sakai and Bangkok caused cytotoxic effects at a dose of 75 µg mL–1 and, moreover, induced the release of IL-6 and IL-8 even at low doses. The release of these two interleukins was highly associated with fluoranthene derivatives, microbial factors (endotoxin and β-glucan), metals (e.g., Ti), and organic (OC2 and OC3) and elemental carbon (EC1) in the PM2.5. Thus, these components potentially contribute to cellular damage and a pro-inflammatory response in the airway epithelial cells, and the effect depends on PM2.5 sources in the locations.

  • Chemical speciation of water-soluble ionic components in PM<inf>2.5</inf> derived from peatland fires in Sumatra Island

    Fujii Y., Huboyo H., Tohno S., Okuda T., Syafrudin

    Atmospheric Pollution Research (Atmospheric Pollution Research)  10 ( 4 ) 1260 - 1266 2019.07

    ISSN  13091042

     View Summary

    © 2019 Turkish National Committee for Air Pollution Research and Control We conducted a field study to characterize water-soluble ionic species in PM2.5 from peatland fires using ground-based samplings at fire sources and receptor sites in the Riau Province, Sumatra, Indonesia. We determined the concentrations of PM2.5 mass, water-soluble ions, and some chemical elements. Through PM2.5 field samplings at three peatland fire sources, we have shown that the mass fractions of typical peatland fire water-soluble ionic components tend to differ between peatland fire sources. Thus, our results indicate that PM2.5 source profiles of water-soluble ionic components for peatland fire must be selected with extreme caution if applied to a receptor model. From the viewpoint of ionic composition of each peatland fire sample, Cl− and NH4+ were consistently dominant anions and cations, respectively, for all peatland fire samples, i.e., NH4Cl was a consistently dominant component. Through field samplings of the ambient PM2.5 in Pekanbaru during peatland fire-induced haze and non-haze periods, we found differences in PM2.5 mass and total water-soluble ionic component concentrations between haze and non-haze samples. Four components, C2O42−, NO3−, SO42−, and NH4+, showed highly elevated levels during haze periods. Since these four ions are recognized as the major secondarily formed aerosol components, the increased total concentrations of water-soluble ionic components during haze periods can mainly be derived from the gas-to-aerosol conversion process. The ionic compositions of haze samples at receptor sites are obviously different from those at peatland fire source samples. In particular, NH4Cl, which is characteristic of peatland fire PM2.5 sources, is low at sites during haze periods.

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Papers, etc., Registered in KOARA 【 Display / hide

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Reviews, Commentaries, etc. 【 Display / hide

  • 環境大気エアロゾルの帯電状態測定の現状と展望

    奥田 知明

    クリーンテクノロジー 27 ( 4 ) 37 - 40 2017.06

    Introduction and explanation (commerce magazine), Single Work

  • 連載 エアロゾル基礎講座 ―計測― 6. 分級②:慣性運動や遠心力を用いた分級

    奥田知明, 榎原研正, 飯田健次郎

    エアロゾル研究 (日本エアロゾル学会)  32 ( 4 ) 276 - 288 2017.12

    Introduction and explanation (scientific journal), Joint Work

  • 環境大気中PM2.5の比表面積の測定

    奥田知明

    クリーンテクノロジー (日本工業出版(株))  25 ( 6 ) 23 - 26 2015.06

    Introduction and explanation (scientific journal), Single Work

  • 東アジアにおけるエアロゾルのフィールド観測および分析法の開発

    奥田知明

    大気環境学会誌 ((公社)大気環境学会)  50 ( 1 ) 1 - 8 2015.01

    Introduction and explanation (scientific journal), Single Work

  • 我が国におけるPM2.5の現状

    OKUDA TOMOAKI

    航空環境研究 18   3 - 9 2014.04

    Introduction and explanation (scientific journal), Single Work

Presentations 【 Display / hide

  • PM2.5の物理化学特性の解明と曝露実験による生体有害性評価

    奥田知明

    第88回日本衛生学会 (東京工科大学蒲田キャンパス、東京都大田区) , 2018.03, Oral Presentation(guest/special), 日本衛生学会

  • Development of measurement techniques of physical and chemical characteristics of atmospheric aerosols related to their adverse health effect

    Okuda, T.

    Frontiers of Atmospheric Aerosol Studies: Toward the Understanding of Their Health and Climatic Effects (Nagoya, Japan) , 2018.01, Oral Presentation(guest/special)

  • Numerical simulation of a parallel plate particle separator for measurement of charging state of PM2.5

    Yonemichi, T., Fukagata, K., Fujioka, K., Okuda, T.

    9th JSME-KSME Thermal and Fluids Engineering Conference (Okinawa, Japan) , 2017.10, Poster (general), JSME

  • PM2.5を集めて測る ~捕集と特性解明の技術~

    奥田知明

    第7回CSJ化学フェスタ (タワーホール船堀、東京都江戸川区) , 2017.10, Oral Presentation(guest/special), 日本化学会

  • 黄砂・PM2.5の健康乳幼児の目・鼻・呼吸器症状への影響 - エコチル調査追加調査『黄砂と子どもの健康調査(パート2)』より -

    金谷久美子、亀田貴之、大久保綾乃、森育子、増本年男、黒沢洋一、大西一成、奥田知明、中山健夫

    第58回大気環境学会年会 (兵庫医療大学、兵庫県神戸市) , 2017.09, Poster (general), 大気環境学会

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Research Projects of Competitive Funds, etc. 【 Display / hide

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

    2020.04
    -
    2024.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, 奥田 知明, Grant-in-Aid for Scientific Research (A) , Principal Investigator

  • Multidisciplinary Analysis of Airborne Particle Surface Area as a New Indicator of Adverse Health Effect of PM2.5

    2018.06
    -
    2021.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, 奥田 知明, Grant-in-Aid for Challenging Research (Exploratory) , Principal Investigator

  • 独自型サイクロン装置により大量捕集されたPM2.5の化学組成と化学形態の簡便迅速非破壊分析法の開発

    2017.11
    -
    2018.10

    (公財)鉄鋼環境基金, 一般研究助成, Commissioned research, Principal Investigator

  • 大流量サイクロン式PM2.5捕集装置のための新規インレットの開発

    2017.07
    -
    2018.03

    Keio University, 慶應義塾先端科学技術研究センター 指定研究プロジェクト, Research grant, Principal Investigator

  • 新規サイクロン式大流量エアロゾル捕集システムのインドおよび中国への展開

    2017.07
    -
    2018.03

    Keio University, 慶應義塾大学若手研究者育成ものづくり特別事業, Research grant, Principal Investigator

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Intellectual Property Rights, etc. 【 Display / hide

  • 微小粒子の捕集装置

    Application No.: 特願2017-132547  2017.07 

    Announcement No.: 特開2018-023970  2018.02 

    Patent, Joint, National application

  • 自動オープンクロマトグラフィー装置

    Application No.:   2007.07 

    Announcement No.:   2007.09 

    Registration No.: 3135990 

    Utility Model, Joint, National application

Awards 【 Display / hide

  • 2015 Asian Young Aerosol Scientist Award

    Tomoaki OKUDA, 2015.06, The Asian Aerosol Research Assembly, Outstanding contribution to aerosol science and technology in Asia

    Type of Award: International Academic Awards.  Country: Japan

  • Best Paper Award, Japan Society for Atmospheric Environment

    Tomoaki OKUDA, Masanobu SAKAIDE, Ayumi IWATA, Motoi FUJIWARA, 2020.09, Japan Society for Atmospheric Environment, Investigation of the Characteristics of Particulate Matter Suspended in a Subway Station Platform

    Type of Award: Awards of National Conference, Council and Symposium.  Country: Japan

  • ベストポスター賞

    小山 茜、何 雯雯、奥田知明, 2019.09, 公益社団法人大気環境学会, 突発性環境不耐症対策マスクの開発の試み

    Type of Award: Awards of National Conference, Council and Symposium.  Country: Japan

  • 第9回日韓熱流体工学会議 優秀講演表彰

    Yonemichi, T., Fukagata, K., Fujioka, K., Okuda, T., 2017.12, 日本機械学会流体工学部門, Numerical simulation of a parallel plate particle separator for measurement of charging state of PM2.5

    Country: Japan

  • ベストポスター賞

    桐谷美穂、山﨑花菜、鳩谷和希、奥田知明、兼保直樹、吉野彩子、高見昭憲、船戸浩二、井上浩三、西田千春、原圭一郎、林政彦、鵜野伊津志、山本重一, 2017.09, 公益社団法人大気環境学会, 福岡におけるエアロゾル表面積の濃度変動支配要因の検討

    Country: Japan

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Courses Taught 【 Display / hide

  • SEMINAR IN APPLIED CHEMISTRY

    2021

  • LABORATORIES IN APPLIED CHEMISTRY C

    2021

  • INTRODUCTION OF ENVIRONMENTAL CHEMISTRY

    2021

  • INDEPENDENT STUDY ON SCIENCE FOR OPEN AND ENVIRONMENTAL SYSTEMS

    2021

  • GRADUATE RESEARCH ON SCIENCE FOR OPEN AND ENVIRONMENTAL SYSTEMS 2

    2021

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Courses Previously Taught 【 Display / hide

  • 自然科学実験(化学)

    Keio University, 2018, Spring Semester, General education subject, Laboratory work/practical work/exercise, Within own faculty

  • 大気環境科学

    Keio University, 2018, Autumn Semester, Major subject, Lecture

  • 化学B

    Keio University, 2018, Autumn Semester, Major subject, Lecture

  • 環境化学2

    Keio University, 2018, Autumn Semester, Major subject, Lecture

  • 応用化学実験CD

    Keio University, 2018, Autumn Semester, Major subject, Laboratory work/practical work/exercise, Within own faculty

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Memberships in Academic Societies 【 Display / hide

  • The Chemical Society of Japan, 

    2015.06
    -
    Present
  • Japan Association of Aerosol Science and Technology, 

    2006.04
    -
    Present
  • The Japan Society for Analytical Chemistry, 

    2004.04
    -
    Present
  • 日本大気化学会, 

    2002.04
    -
    Present
  • Japan Society for Atmospheric Environment, 

    2002.04
    -
    Present

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Committee Experiences 【 Display / hide

  • 2020.09
    -
    Present

    常任理事, 大気環境学会

  • 2020.06
    -
    Present

    新型コロナウイルス対策専門家会議委員, 内閣府

  • 2019.04
    -
    Present

    環境安全推進委員会委員長, 日本化学会

  • 2019.04
    -
    2020.03

    PM2.5対策総合推進委員会委員, 環境省

  • 2017.08
    -
    2020.07

    常任理事, 日本エアロゾル学会

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