Research

In our laboratory, we are developing novel source apportionment techniques and differentiation methods by utilizing compound-specific stable isotope ratios of chemical substances found in ambient fine particulate matter (PM2.5), pesticides, volatile organic compounds (VOCs), and food products.

For example, PM2.5 consists of various chemical components. By conducting high-precision analysis of the nitrogen and oxygen stable isotope ratios in nitrate and the nitrogen isotope ratio in ammonium, we aim to identify their sources and atmospheric transformation pathways.

We also focus on LC/IRMS (liquid chromatography–isotope ratio mass spectrometry), a technique that enables the measurement of compound-specific stable isotope ratios in water-soluble organic compounds. Currently, our laboratory is the only one in Japan actively conducting research using this technology. While there are still many technical challenges to overcome, we are working on instrumental improvements, method development, and a wide range of applied studies using this platform.

In addition, we are now taking on the challenge of stable isotope analysis using high-resolution mass spectrometry (HR-MS) to expand our analytical capabilities to new classes of compounds.

By leveraging these cutting-edge, high-precision analytical technologies, we aim to contribute to the rapid resolution and prevention of environmental problems and food fraud, which are critical issues in modern society.

Our current research activities are broadly categorized into the following six areas.