J. Phys. IV France 7 (1997) C2-713-C2-714
Trace Chemical Characterization of Liquid Drop by Fluorescence Detection of Absorption Edge Shifts using Total Reflection SupportK. Sakurai1, A. Iida2 and H. Shintani3
1 National Research Institute for Metals, 1-2-1 Sengen, Tsukuba, Ibaraki 305, Japan
2 Photon Factory, 1-1 Oho, Tsukuba, Ibaraki 305, Japan
3 National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya, Tokyo 158, Japan
An analytical technique to investigate the chemical state of trace metals in a small amount of sample has been proposed. While the principle for distinguishing the chemical state is based on well known X-ray spectroscopic phenomena, i.e., chemical shifts of the absorption edges, a total reflection mirror has been employed as a support to enhance the signal to background ratio through the reduction of scattering X-ray background. The present paper describes the details of the analytical procedure and shows the successful results of the near edge absorption spectrum of trace iron (~ mM) in a wet liquid drop (~ µl) measured in 3 ~ 5 min. The feasibility of the application to biomedical science is also mentioned.
© EDP Sciences 1997