Development of amprometric titrator using a current-integration method for the detrmination of chlorine oxides.

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  • IMAEDA Kazuo
    Department of Analytical Chemistry, Faculty of Pharmaceutical Science, Hoshi University
  • WATANABE Takaho
    Department of Analytical Chemistry, Faculty of Pharmaceutical Science, Hoshi University
  • TANAKA Masaharu
    Department of Analytical Chemistry, Faculty of Pharmaceutical Science, Hoshi University
  • YOSHIMURA Yoshihiro
    Department of Analytical Chemistry, Faculty of Pharmaceutical Science, Hoshi University
  • UCHIYAMA Katsumi
    Department of Analytical Chemistry, Faculty of Pharmaceutical Science, Hoshi University
  • OHSAWA Keiko
    Department of Analytical Chemistry, Faculty of Pharmaceutical Science, Hoshi University

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Other Title
  • 塩素酸化物定量のための電流積分型電流滴定装置の開発
  • エンソ サンカブツ テイリョウ ノ タメ ノ デンリュウ セキブンガタ デンリ

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Abstract

Chlorine dioxide, which inactivates bacteria and viruses over a broad pH range and does not produce trihalomethanes, can be used for disinfection of drinking water. Commercially available instruments based on amperometric titration lack sensitivity for the determination of chlorine oxides. We developed an amperometric titrator (AT) using a current-integration method in order to increase sensitivity for the determination of oxidized chlorine species. The AT consists of capacitors, an electrometer, a D/A converter, logic control circuit, a track/hold and a digital voltmeter. A constant voltage generated by the D/A converter is applied between a pair of platinum electrodes. The capacitor integrates diffusion current. The electrometer measures the terminal voltages of the capacitors. Minimum resolution for AT was a few pA. The relative standard deviation of the titration was less than 0.2%. Detection limit of iodine measurement was 5 ppb.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 39 (8), T121-T124, 1990

    The Japan Society for Analytical Chemistry

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