Hajime Obata / Associate Professor / Division of Environmental Studies
Department of Natural Environmental Studies / / Marine biogeochemistry of trace elements

Career Summary
1991: Graduated, Faculty of Science, Kyoto University
1997: Doctor of Science from Kyoto University
1997-1998: JSPS postdoctoral fellow in The University of Shiga Prefecture
1999-2000: COE postdoctoral fellow in ORI, The University of Tokyo
2000-2001: JSPS research fellow in University of Liverpool (UK)
2001: Assistant Professor, ORI, The University of Tokyo
2003: Lecturer, ORI, The University of Tokyo
2007: Associate Professor, ORI, The University of Tokyo
Educational Activities
Graduate School: Marine biogeochemical cycles
Research Activities
Biogeochemical cycles of trace metals in the open ocean (2001- present)
We are studying the biogeochemical processes that control the distribution of trace metals in seawater.
1) Obata, H., T. Yoshida, H. Ogawa: Determination of picomolar levels of platinum in estuarine waters: a comparison of cathodic stripping voltammetry and isotope dilution-inductively coupled plasma mass spectrometry. Analytica Chimica Acta, 580, 32-38, 2006.
2) Obata, H., T. Doi, Y. Hongo, D.S. Alibo, H. Minami, Y. Kato, M. Maruo: Manganese, cerium, and iron in the Philippine, Celebes, and Sulu Seas. Deep-Sea Research II, 54, 38-49, 2007.
Other Activities
Geochemical Society of Japan
The Oceanographic Society of Japan
The Japan Society for Analytical Chemistry

2007- present: A member of the GEOTRACES Standards and Intercalibtration Committee
Future Plan
Speciation of trace metals in seawater is not well known.
We are developing a methodology to reveal the speciation of trace metals in seawater.
Messages to Students
I hope to work with those who want to both do experiments in the laboratory and participate the field work.
Both laboratory and field studies are essential in my research field.