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

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タイトル別名
  • Development of amprometric titrator using a current-integration method for the detrmination of chlorine oxides.
  • 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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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.

収録刊行物

  • 分析化学

    分析化学 39 (8), T121-T124, 1990

    公益社団法人 日本分析化学会

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