Photo-Pyroelectric Spectrometry and its Application to Flow Analysis

Research Project

Project/Area Number	01550571
Research Category	Grant-in-Aid for General Scientific Research (C)
Allocation Type	Single-year Grants
Research Field	工業分析化学
Research Institution	Osaka University
Principal Investigator	HINOUE Teruo Osaka Univ., Dept. Chem., Assist., 理学部, 助手 (50143821)
Co-Investigator(Kenkyū-buntansha)	FUKUMOTO Takao Osaka Univ., Dept. Chem., Tech. Official, 理学部, 教務員 (10199268)
Project Period (FY)	1989 – 1990
Project Status	Completed (Fiscal Year 1990)
Budget Amount *help	¥1,800,000 (Direct Cost: ¥1,800,000) Fiscal Year 1990: ¥300,000 (Direct Cost: ¥300,000) Fiscal Year 1989: ¥1,500,000 (Direct Cost: ¥1,500,000)
Keywords	Photothermal spectrometry / Pyroelectric effect / PZT / Flow injection analysis / Absorption spectrometric analysis / He-Ne laser / 焦電センサ- / フロ-分析法 / 吸光分析法
Research Abstract	Photo-pyroelectric spectrometry (PPES) with a compact sensor probe including a PZT pyroelectric ceramic piece and a He-Ne laser as an excitation source was studied. The signal induced by the laser irradiation in a mode of step function or in a modulated mode could be explained by a classic theory on heat conduction. The detection limit was determined as 1.6 x 10^<-4> cm^- in the Napierian absorption coefficient. The PPES was applied to batchwise colorimetric determination of phosphate and ammonia in natural water on the basis of the heteropoly blue method and the indophenol method, respectively. The detection limit was 2.7 ppb for PO_4^+-P and 2.1 ppb for NH_4^+-N. Further, flow analysis was tested by using the PPES. The detection limit was 0.97 x 10^<-4> cm^<-1>, which was slightly better than that of the batchwise method. This shows that the PPES is available for a detector in the flow analysis. The flow injection analysis for phosphate and silicate was performed by using the PPES. In order to use the PPES practically, the use of a laser diode with high power and improvement of the flow cell and the PZT sensor probe are desired.