Simultaneous determination of residual chlorine and other anions in water by ion chromatography

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  • HUI Li
    Department of intelligent system, Graduate School of Engineering, Tokyo Metropolitan Institute of Technology
  • NONOMURA Makoto
    Department of intelligent system, Graduate School of Engineering, Tokyo Metropolitan Institute of Technology Resource and Environmental Technology Group, Tokyo Metropolitan Industrial Technology Research Institute
  • ITOH Noriko
    Department of intelligent system, Graduate School of Engineering, Tokyo Metropolitan Institute of Technology

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Other Title
  • イオンクロマトグラフィーによる水中の残留塩素と他の陰イオンとの同時定量
  • イオン クロマトグラフィー ニ ヨル スイチュウ ノ ザンリュウ エンソ ト タ ノ インイオン ト ノ ドウジ テイリョウ

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Abstract

An ion chromatographic method (IC) has been studied to determine residual chlorine and other anions in water simultaneously using a conductivity detector. It is based on the formation of chloramine-T by the reaction of residual chlorine and a p-toluenesulfonamide aqueous solution, followed by the conversion of chloramine-T to cyanogen chloride with potassium cyanide. Cyanogen chloride is then oxidized to cyanate ion at 25°C for 10 min. Because cyanate ion (pKa = 3.66) can be measured by IC with a conductivity detector, residual chlorine can be determined indirectly from the peak area of the cyanate ion. The cyanate ion is stable for 4 hours, with no inferences from Cl−, NO3− or SO42−. A linear relationship between the concentration of residual chlorine and the peak area of cyanate ion was obtained in the concentration range of 0.02 to 2 mg Cl2 l−1. The relative standard deviation (RSD) was about 3.56% (n = 5) for 0.1 mg Cl2 l−1. The proposed method was applied to the determination of residual chlorine in tap water and compared with diethyl-p-phenylenediamine (DPD) spectrophotometry. An exceptionally good agreement was obtained.<br>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 52 (9), 819-824, 2003

    The Japan Society for Analytical Chemistry

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