Studying Chemistry in Okinawa!CurriculumFaculty

Takemitsu Arakaki

1. Environmental Chemistry, Atmospheric Chemistry, Photochemistry

2. Name : Takemitsu Arakaki

3. E-mail : arakakit@sci.u-ryukyu.ac.jp

4. Phone : +81-98-895-8553

5. Facsimile : +81-98-895-8565

6. Website :

7. Education :

1990: B.S. Chemistry, University of the Ryukyus, Okinawa

1993: M.S. Civil and Environmental Engineering, Duke University, North Carolina, U.S.A.

1996: Ph.D. in Environmental Chemistry, Duke University, North Carolina, U.S.A.

Professional Appointments :

1997-1999: JST Postdoctoral Fellow, Hiroshima University, Hiroshima, Japan

1999-2001: Scientist, Proctor & Gamble, Co., Kobe, Japan

2001-2005: Assistant Professor, University of the Ryukyus, Okinawa, Japan

2005-2010: Associate Professor, University of the Ryukyus, Okinawa, Japan

2011-present: Professor, University of the Ryukyus, Okinawa, Japan

8. Research Interests :

・Long-range transport of air pollutants

・Photochemical formation of oxidants in aqueous phase such as rain and aerosol

・Photochemical transformation of chemicals in sea surface microlayer

・OH radical chemistry in the environment

9. Publications

  • Faust, B.C., C. Anastasio, J.M. Allen, and T. Arakaki, Aqueous-Phase Photochemical Formation of Peroxides in Authentic Cloud and Fog Waters, Science, 260, 73–75 (1993).
  • Arakaki, T., C. Anastasio, P.G. Shu, and B.C. Faust, Aqueous-Phase Photoproduction of Hydrogen Peroxide in Authentic Cloud Waters: Wavelength Dependence, and the Effect of Filtration and Freeze-Thaw Cycles, Atmospheric Environment, 29, 1697–1703 (1995).
  • Arakaki, T. and B.C. Faust, Sources, Sinks, and Mechanisms of Hydroxyl Radical (·OH) Photoproduction and Consumption in Authentic Acidic Continental Cloud Waters from Whiteface Mountain, New York: the Role of the Fe(r) (r=II, III) Photochemical Cycle, Journal of Geophysical Research, 103 No D3, 3487–3504 (1998).
  • Arakaki, T., T. Miyake, M. Shibata, and H. Sakugawa, pH Dependent Photoformation of Hydroxyl Radical and Absorbance of Aqueous-Phase N(III) (HNO2and NO2), Environmental Science and Technology, 33, 2561–2565 (1999).
  • Nakatani, N., T. Miyake, M. Chiwa, N. Hashimoto, T. Arakaki, and H. Sakugawa, Photochemical Formation of OH Radicals in Dew Formed on the Pine Needles at Mt. Gokurakuji, Water, Air & Soil Pollution, 130,397–402 (2001).
  • Kume, A., T. Arakaki, N. Tuboi, N. Suzuki, D. Kuramoto, K. Nakane, and H. Sakugawa, Effects of Radicals Generated in Polluted Dew on the Needles of Japanese Red Pine (Pinus densiflora), New Phytologist, Vol. 152, 53–58 (2001).
  • Kobayashi, T., N. Nakatani, T. Hirakawa, M. Suzuki, T. Miyake, M. Chiwa, T. Yuhara, N. Hashimoto, K. Inoue, K. Yamamura, N. Agus, J. R. Sinogaya, K. Nakane, A. Kume, T.Arakaki, and H. Sakugawa, Variation of CO2Assimilation Rate Induced by Simulated Dew Waters with Different Sources of Hydroxyl Radical (•OH) on the Needle Surfaces of Japanese Red Pine (Pinus densiflora Sieb. et Zucc.), Environmental Pollution, 118, 383–391 (2002).
  • Arakaki, T., M. Shibata, T. Miyake, T. Hirakawa, and H. Sakugawa, Enhanced Formation of Formate by Freezing in Solutions of Hydrated Formaldehyde-Metal-Hydrogen Peroxide, Geochemical Journal, Vol. 38, 383–388 (2004).
  • Arakaki, T., H. Fujimura, A. M. Hamdun, K. Okada, H. Kondo, T. Oomori, A. Tanahara, and H. Taira, Simultaneous Measurement of Hydrogen Peroxide and Fe species (Fe(II) and Fe(tot))in Okinawa Island Seawater – Impacts of Red Soil Pollution, Journal of OceanographyVol. 61, 561–568 (2005).
  • Arakaki, T., Y. Kuroki, K. Okada, Y. Nakama, H. Ikota, M. Kinjo, T. Higuchi, M. Uehara, and A. Tanahara, Chemical Composition and Photochemical Formation of Hydroxyl Radicals in Aqueous Extracts of Aerosol Particles Collected in Okinawa, Japan, Atmospheric Environment,Vol. 40, 47644774 (2006).
  • Okada, K. Y. Kuroki, Y. Nakama T. Arakaki, and A. Tanahara, Wavelength-dependence of photochemical formation of Fe(II) in aqueous extracts of aerosol particles collected in Okinawa, Japan, Environmental Science and Technology, Vol. 40, 7790–7795 (2006).
  • Nakajima, H., K. Okada, Y. Kuroki, Y. Nakama, D. Handa, T. Arakaki, A. Tanahara,Photochemical formation of peroxides and fluorescence characteristics of water-soluble fraction of bulk aerosols collected in Okinawa, Japan, Atmospheric Environment, Vol. 42, 3046–4058 (2008).
  • Fujimura, H., T. Higuchi, K. Shiroma, T. Arakaki, A.M. Hamdun, Y. Nakano and T. Oomori, Continuous-flow complete-mixing system for assessing the effects of environmental factors on colony-level metabolism of a coral, Journal of Biochemical and Biophysical Methods, Vol. 70, 865–872 (2008).
  • Higuchi, T., H. Fujimura, H. Ikota, T. Arakaki and T. Oomori,The effects of hydrogen peroxide on metabolism in the coral, Goniastrea aspera, Journal of Experimental Marine Biology and Ecology Vol. 370, pp. 48-55(2009).
  • Higuchi T., H. Fujimura,T. Arakaki and T. Oomori, The synergistic effects of hydrogen peroxide and elevated seawater temperature on metabolic activities of the coral, Galaxea fascicularisMarine Biology, Vol. 156, Issue 4, 589596(2009)
  • Arakaki, T., K. Saito, and K. Okada, H. Nakajima, Y. Hitomi, Contribution of Fulvic Acid on Photochemical Formation of Fe(II) in Acidic Suwannee River Fulvic Acid Solutions, Chemosphere, Vol. 78, Issue 8, 10231027 (2010).
  • Handa, D., H. Nakajima, T. Arakaki, H. Kumata, Y. Shibata and M. Uchida,Radiocarbon analysis of BC and OC in PM10aerosols at Cape Hedo, Okinawa, Japan, during long-range transport events from East Asian countries, Nuclear Instruments and Methods in Physics, B, 268, 1125–1128 (2010).
  • Arakaki, T., A. M., Hamdun, M. Uehara, and K. Okada, Photochemical Formation of Hydroxyl Radical in Red-Soil-Polluted Seawater on the North of Okinawa Island, Japan, Water, Air and Soil Pollution, 209, 191198 (2010).
  • Teraji, T., and T. Arakaki, Bimolecular rate constant between levoglucosan and hydroxyl radical: Effects of pH and temperature, Chemistry Letters, Vol. 39, No. 8, 900-901 (2010).
  • Higuchi, T., H. Fujimura, Y. Hitomi, T. Arakaki, T. Oomori, Y. Suzuki, Photochemical formation of hydroxyl radicals in tissue extracts of the coral Galaxea fascicularis, Photochemistry and Photobiology, 86,  1421–1426 (2010).
  • Hatakeyama, S., S. Hanaoka, K. Ikeda, I. Watanabe, T. Arakaki, Y. Sadanaga, H. Bandow, S. Kato, Y. Kajii, K. Sato, A. Shimizu, and A. Takami, Aerial observation of aerosols transported from East Asia -chemical composition of aerosols and layered structure of an airmass over the East China Sea, Aerosol and Air Quality Research, 11: 497–507, doi: 10.4209/aaqr.2011.06.0076 (2011).
  • Arakaki, T., C. Anastasio, Y. Kuroki, H. Nakajima, K. Okada, Y. Kotani, D. Handa, S. Azechi, T. Kimura, A. Tsuhako, and Y. Miyagi, A General Scavenging Rate Constant for the Reaction of Hydroxyl Radical with Organic Carbon in Atmospheric Waters, Environmental Science and Technology, doi: 10.1021/es401927b,47, 8196−8203 (2013).
  • Tanahara, A., F. Nakaema, Y. Zamami, T. Arakaki. Atmospheric Concentrations of 210Pb and 7Be Observed in Okinawa Islands. RADIOISOTOPES, 63, 175–181 (2014)
  • Irei,S., A. Takami, M. Hayashi, Y. Sadanaga, K. Hara, N. Kaneyasu, K. Sato,T. Arakaki, S. Hatakeyama, H. Bandow, T. Hikida, and A. Shimono, Transboundary secondary organic aerosol in western Japan indicated by δ13C of water-soluble organic carbon and m/z 44 signal in organic aerosol mass spectra, Environmental Science and Technology, doi: 10.1021/es405362y, 48, 6273–6281 (2014).
  • Fujiwara H., Y. Sadanaga, J. Urata, Y. Masui, H. Bandow, K. Ikeda, S. Hanaoka, I. Watanabe, T. Arakaki, S. Kato, Y. Kajii, D. Zhang, K. Hara, T. Fujimoto, T. Seto, K. Okuyama, T. Ogi, A. Takami, A. Shimizu, S. Hatakeyama, Aerial observation of nitrogen compounds over the East China Sea in 2009 and 2010, Atmospheric Environment,97, 462–470 (2014).
  • Hatakeyama, S.,K. Ikeda, S. Hanaoka, I. Watanabe, T. Arakaki, H. Bandow, Y. Sadanaga, S. Kato, Y. Kajii, D. Zhang, K. Okuyama, T. Ogi, T. Fujimoto, Seto, A. Shimizu, N. Sugimoto, and A. Takami, Aerial Observations of Air Masses Transported from East Asia to the Western Pacific: Vertical Structure of Polluted Air Masses, Atmospheric Environment, 97, 456–461 (2014).
  • Arakaki, T., S. Azechi, Y. Somada, M. Ijyu, F. Nakaema, Y. Hitomi, D. Handa, Y. Oshiro, Y. Miyagi, A. Tsuhako, H. Murayama, Y. Higaonna, A. Tanahara, A. Itoh, S. Fukushima, K. Higashi, Y. Henza, R. Nishikawa, H. Shinjo, and H. Wang, Spatial and Temporal Variations of Chemicals in the TSP Aerosols Simultaneously Collected at Three Islands in Okinawa, Japan, Atmospheric Environment, Vol. 97, 479–485 (2014).http://dx.doi.org/10.1016/j.atmosenv.2014.04.040.
  • S. N. Nomi, Y. Higaonna, T. Kasaba, and T. ArakakiBimolecular rate constants for polyacrylamide and hydroxyl radicals, Chemistry Letters, 44, No.2, 220–222 (2015).
  • Shimada, K., M. Shimada, A. Takami, S. Hasegawa, A. Fushimi, T. Arakaki, I. Wanatabe, and S. Hatakeyama, Mode and Place of Origin of Carbonaceous Aerosols Transported From East Asia to Cape Hedo, Okinawa, Japan. Aerosol and Air Quality Research, 15, 799–813 (2015),
  • Irei, S., A. Takami, Y. Sadanaga, T. Miyoshi, T. Arakaki, K. Sato, N. Kaneyasu, H. Bandow and S. Hatakeyama, Transboundary Secondary Organic Aerosol in Western Japan: An ObservedLimitation of the f44 Oxidation Indicator, Atmospheric Environment, 120, 71–75 (2015), dx.doi.org/10.1016/j.atmosenv.2015.08.070.
  • Hamdun A. M. and T. Arakaki, Analysis of ground level ozone and nitrogen oxides in the city of Dar es Salaam, and Rural area Bagamoyo, Tanzania, Open Journal of Air Pollution, 4, 224–238 (2015), http://dx.doi.org/10.4236/ojap.2015.44019.
  • K.M.G. Mostofa, C.-Q. Liu, W.D. Zhai, M. Minella, D. Vione, K. Gao, D. Minakata, T. Arakaki, T. Yoshioka, K. Hayakawa, E. Konohira, E. Tanoue, A. Akhand, A. Chanda, B. Wang, and H. Sakugawa, Reviews and Syntheses: Ocean acidification and its potential impacts on marine ecosystems, Biogeosciences13, 1767–1786 (2016), doi:10.5194/bg-13-1767-2016.
  • Hamdun, A.M., Y. Higaonna, H. Uehara, T. Arakaki, Role of the Fenton Reaction in Coastal Seawater Samples Collected in Okinawa, Japan, Chemistry Letters 46, 42–44 (2017), doi:10.1246/cl.160894.
  • Nakano, K., Y. Oshiro, S. Azechi, Y. Somada, D. Handa, Y. Miyagi, A. Tanahara, T. Arakaki and A. Itoh, Preparation of standard materials of aerosol particles for X-ray fluorescence analysis using a small chamber sampling unit, X-Ray Spectrometry47, 450-458 (2018), doi.org/10.1002/xrs.2973.
  • Itoh, A. Y. Oshiro, S. Azechi, Y. Somada,D. Handa,Y. Miyagi, K. Nakano, A. Tanahara, and T. Arakaki, Long-Term Monitoring of Metal Elements in the Total Suspended Particle Aerosols Simultaneously Collected at Three Islands in Okinawa, Japan, Asian Journal of Atmospheric Environment, 12, No. 4, pp. 326-337 (2018), doi: https://doi.org/10.5572/ajae.2018.12.4.326.
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