Studies focus on the distribution pattern and circulation mechanism of anthropogenic greenhouse gases, acid-generating substances and hazardous pollutants in the atmosphere and hydrosphere by monitoring and simulating past, present as well as future trends of chemical species concerned
1) Development of analytical methods for tracing reactive oxygen species, and elucidation of oxidation and decomposition processes of organic pollutants by gas phase, liquid phase and solid surface reactions involving natural sunlight (Takeda, K.)
2) Physical measurement and chemical analysis of particulate matters (suspended particles and/or atmospheric aerosols) in the atmosphere and hydrosphere. Biogeochemical cycles between atmosphere and ocean via particulate matters. Interaction between atmospheric aerosol and cloud/precipitation (Iwamoto, Y.)
Vegetation effects of air pollution/acid rain, Measurement and behavior of reactive oxygen species, Photochemical reaction mechanism in the hydrosphere
Trace analysis of chemical species in environmental samples
Monitoring of pollutants and greenhouse gases in seawater of the Seto Inland Sea during a cruise of the Toyoshio-Maru
Takeda, K., Moriki, M., Oshiro, W., Sakugawa, H., (2013) Determination of phenolic concentrations in dissolved organic matter pre-concentrate using solid phase extraction from natural water. Marine Chem., 157, 208-215.
Takeda, K., Nagano, K., (2013) Phenol formation in gamma radiolysis of aqueous benzene solution with sodium hypochlorite. J. Phys. Chem. A, 117, 1941－1945.
Olasehinde, E.F., Takeda, K., Sakugawa, H., (2010) Photochemical production and consumption mechanisms of nitric oxide in seawater. Environ. Sci. & Technol. 44: 8403–8408.
Takeda K., (2011) Chemical dosimetry system for γ-ray irradiation based on the formation of phenol from aqueous benzene solutions. Analytical Sciences, 27: 1213-1216.
Wang, W., Johnson, C., Takeda, K., Zafiriou, O., (2009) Measuring the Photochemical Production of Carbon Dioxide from Marine Dissolved Organic Matter by Pool Isotope Exchange. Environmental Science & Technology, 43: 8604-8609.
Iwamoto, Y., Kinouchi, K., Watanabe, K., Yamasaki, N. and Matsuki, A. (2016) Simultaneous measurement of CCN activity and chemical composition of fine-mode aerosols at Noto Peninsula, Japan, in autumn 2012, Aerosol and Air Quality Research, 16: 2107-2118.
Iwamoto, Y. and Uematsu, M. (2014) Spatial variation of biogenic and crustal elements in suspended particulate matter from surface waters of the North Pacific and its marginal seas, Progress in Oceanography, 126: 211-223.