Institute for Agro-Environmental Sciences, NARO

Environmental Inorganic Chemistry Unit

Hazardous inorganic materials are distributed at various concentrations in soils, which dissolve in soil solution, reacting with various soil constituents, e.g. ion exchange on charged sites of soil colloids, strong adsorption to soil humus and oxyhydroxides of iron and aluminum, and formation of hardly soluble compounds. As the reactions are under dynamic equilibrium, concentration of hazardous inorganic materials in soil solution and absorbability of crops are greatly influenced by soil environmental conditions such as amount of rainfall, temperature, plowing, manure application, flooding and other artificial activities.

Research in the Environmental Inorganic Chemistry Unit is focused on the dynamics of hazardous inorganic materials including Cadmium (Cd), Arsenic (As) and radioactive cesium in soils to develop remediation technologies for contaminated site and reduce the hazardous inorganic materials in crops.

Unit Leader

Tomoyuki MAKINO
Research Topic: Dynamics of heavy metals in soil environments, chemical remediation for agricultural fields contaminated with cadmium and arsenic

Unit Members

Research Topic
Hidetaka KATOU Senior Principal Researcher Soil physical approach to minimizing arsenic and cadmium solubilization in paddy soils.
Megumi SUGIYAMA Principal Researcher Radiocesium behavior in agricultural environments.
Noriko YAMAGUCHI Principal Researcher Physico-chemical process of metals and metalloids in soil environments. Radiocesium behavior in agricultural environments.
Ken NAKAMURA Senior Researcher Dynamics of heavy metals in soil environments especially in arsenic and cadmium in paddy soil.
Ikuko AKAHANE Senior Researcher Dynamics of heavy metals in soil environments, prediction of arsenic uptake by rice plant
Aomi SUDA Researcher Dynamics of heavy metals in soil environments, attenuation of arsenic uptake by rice plant using soil amendments.

Research Publications

  • Makino T, Nakamura K, Katou H, Ishikawa S, Ito M, Honma T, Miyazaki N, Takehisa K, Sano S, Matsumoto S, Suda A, Baba K, Kawasaki A, Yamaguchi N, Akahane I, Tomizawa M, Arao T (2016). Simultaneous decrease of arsenic and cadmium in rice (Oryza sativa L.) plants cultivated under submerged field conditions by the application of iron-bearing materials.Soil Science and Plant Nutrition, 62, 340-348
  • Suda A, Makino T (2016). Effect of organic amendments on arsenic solubilization in soils during long-term flooded incubation. International Journal of Environmental Science and Technology, 13, 2375-2382.
  • Yamaguchi N, Mitome M, Akiyama-Hasegawa K, Asano M, Adachi K, Kogure T (2016).Internal structure of cesium-bearing radioactive microparticles released from Fukushima nuclear power plant. Scientific Reports 6 20548 doi:10.1038/srep20548
  • Nakamura K, Katou H (2013). Arsenic and cadmium solubilization and immobilization in paddy soils in response to alternate submergence and drainage. In Competitive sorption and transport of heavy metals in soils and geological media,H M Selim Ed., CRC press, Boca Raton, FL, pp 379-404.