フローインジェクション/電気化学検出法による残留塩素の定量 (<特集>分離・検出と機能物質)

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タイトル別名
  • Separation, Detection, and Functional Materials. Determination of residual chlorine by flow injection/electrochemical detector.
  • 分離・検出と機能物質　　フローインジェクション／電気化学検出法による残留塩素の定量
  • フローインジェクション デンキ カガク ケンシュツホウ ニ ヨル ザンリュウ エンソ ノ テイリョウ

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An electrochemical detector for flow injection analysis (FIA) was designed and applied to the determination of residual chlorine. The detector consists of a working electrode (changeable solid electrode), a counter electrode (platinum wire) and a reference electrode {saturated calomel electrode (SCE)}. Evaluation of the detector was carried out using hexacyanoferrate (II). A linear relationship was obtained in the concentration range of 2×10-7 to 2×10-4 M. The relative standard deviation (RSD) for ten injections was less than 1%. The electrochemical behavior of hypochlorous acid was examined using cyclic voltammetry. At a gold electrode, a reduction wave of hypochlorous acid was observed at + 0.3 V vs. SCE. A linear calibration curve was obtained in the concentration range of 0.05 to 2.5 mg l-1 when the gold electrode was applied to the FIA. The RSD was 2.1% for 1 mg l-1 hypochlorous acid. The proposed method was applied to the determination of residual chlorine in tap water. The results agreed well with those obtained by the ο-tolidine photometric method.

収録刊行物

  • 分析化学

    分析化学 48 (12), 1123-1127, 1999

    公益社団法人 日本分析化学会

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