ATR-Far Ultraviolet Spectroscopy for Observing Chemical Form of Ions

2016 Fiscal Year Final Research Report

• Project/Area Number: 26410167
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Analytical chemistry
• Research Institution: National Agriculture and Food Research Organization
• Principal Investigator: IKEHATA Akifumi 国立研究開発法人農業・食品産業技術総合研究機構, 食品研究部門 食品分析研究領域, ユニット長 (40342745)
• Co-Investigator(Renkei-kenkyūsha): OZAKI Yukihiro 関西学院大学, 理工学部, 教授 (00147290)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 遠紫外 / ATR / CTTSバンド / Kramers-Kronig変換 / 凍結濃縮 / 水 / 第一電子遷移

Outline of Final Research Achievements

A new method of attenuated total reflection far-ultraviolet spectroscopy to observe the chemical form of the ion by use of CTTS band of the halide ion. The proposed method of salinity measurement is based on chloride CTTS band observed near 175 nm showing linear change for salinity in an extremely wide concentration range. In comparison to the conventional methods, the proposed spectroscopic method realizes indicator-free and real-time measurement. The method was applied to a generation process of silver chloride, salinity measurement in food such as soy sauce and miso, and a freeze concentration process of the NaCl-water solutions. In addition, a correction method of the inherent distortion derived from an instrument for Kramers-Kronig conversion was also newly proposed for perfect conversion from ATR spectra to absorption (extinction) spectra in the far- and deep-ultraviolet region.

Free Research Field

分析化学