Aquatic and Soil Environment

Science that studies water and soil pollution

Approaches from macro and micro viewpoints

Water and materials circulate between the atmosphere, hydrosphere, geosphere and biosphere, i.e., the four spheres that form the earth. This laboratory investigates the geochemical cycles of toxic substances (e.g., trace elements including heavy metals) in the environment from a macro viewpoint that treats these four spheres as one system. In contrast, mechanisms of soil pollution by heavy metals are studied from a micro viewpoint. Moreover, this laboratory addresses local environmental problems in Shizuoka Prefecture. These researches contribute to the assessment of environmental risks and the development of environmental monitoring and mitigation measures. Field work is important in the achievement of our researches. Practical environmental science is learnt through the performance of sampling and chemical analysis.

1. Long-range transport of trace elements from the Asian continent.
In Japan, there have been increasing environmental concerns associated with the long-range transport of air pollutants from the Asian continent owing to the economic expansion of China. We evaluated the impact of coal burning in China on the wet deposition fluxes and concentrations in precipitation of trace elements using boron isotopes as a tracer of emissions from coal burning.
2. Mass balance and sources of trace elements in Tokyo Bay.
Understanding the loads and sources of toxic substances in aquatic environments is essential for the evaluation of their environmental risks and the preservation of ecosystems. We have investigated the mass balance and sources of trace elements in Tokyo Bay.
3. Mineral(loid)-microbe interaction in aquatic environments.
We investigate behaviors of metals and metalloids in the natural environments with direct speciation by synchrotron-based analytical technique. By coupling the synchrotron analysis with a molecular biological technique, the interaction between the metal(loid)s and microbes such as bacteria are also studied from both chemical and biological aspects.


Masahiro SakataPhD


Asami MashioPhD


Details are here



Seasonal variations in wet deposition flux and concentration in precipitation for lead (upper) and boron isotope ratio of precipitation (lower).


Microscale elemental maps of soil particle contaminated by arsenic.


  1. Environ. Sci. Technol. 38, 2190–2197 (2004)
  2. Atmos. Environ. 39, 3139–3146 (2005)
  3. Atmos. Environ. 41, 1669–1680 (2007)
  4. Environ. Sci. Technol. 44, 1281–1287 (2010)
  5. Environ. Sci. Technol. 44, 3712–3718 (2010)
  6. Environ. Sci. Technol. 46, 3304-3311 (2012)