Development of a Palmtop-Size Constant-Current Coulometric/Photometric Titrator and Its Application for Determining the Peroxide Value of Edible Oils

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  • SUZUKI Yasutada
    Department of Applied Chemistry, Interdisciplinary School of Medicine and Engineering, University of Yamanashi
  • JIN Jiye
    Department of Chemistry, Faculty of Science, Shinshu University
  • ARISAWA Kei
    Department of Applied Chemistry, Interdisciplinary School of Medicine and Engineering, University of Yamanashi
  • KAWAKUBO Susumu
    Department of Applied Chemistry, Interdisciplinary School of Medicine and Engineering, University of Yamanashi
  • IWATSUKI Masaaki
    Department of Applied Chemistry, Interdisciplinary School of Medicine and Engineering, University of Yamanashi

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Other Title
  • 小型定電流電解電量／光度滴定装置の開発と食用油の過酸化物価定量への応用
  • コガタ テイデンリュウ デンカイデンリョウ コウド テキテイ ソウチ ノ カイハツ ト ショクヨウアブラ ノ カサンカ ブツカ テイリョウ エ ノ オウヨウ

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Abstract

A palmtop-size coulometric titrator based on the photometric detection principle was developed for determining the peroxide value (POV) in samples of edible oil. The circuit for electrolysis was composed of a voltage booster that could generate +30 V from +5 V of a power source, while a circuit for constant-current control was fabricated using a junction-type field-effect transistor (JFET), which could supply a current of 0 to 2 mA. In this titrator, a photometric cell with a 2-cm optical path length served as an electrolysis compartment containing a generator electrode. The end point of titration was determined photometrically by monitoring the absorbance of the electrolytic solution during the electrolysis with a home-made colorimeter using an ultra-violet light-emitting diode (UV-LED, emission wavelength 370 nm) as a light source and two photodiodes (PDs) as detectors. The data corresponding to the absorbance, elapsed electrolysis time, and the electrolysis current were collected by an external PC via a serial interface built in the controller. It was demonstrated that the titrator could provide good accuracy and precision in the standardization of a sodium thiosulfate solution. Finally, the device was applied to the determination of POVs in samples of edible oil; the analytical results were in good agreement with those determined by iodometry. Moreover, the titrator showed a capability for the determination of some colored samples whose end point was hardly determined by conventional iodometry. The advantages of versatility, accuracy as well as sensitivity in end point detection make the device attractive for the determination of POVs in many practical samples.<br>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 55 (3), 171-176, 2006

    The Japan Society for Analytical Chemistry

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