Ion-exclusion/cation-exchange Chromatography with Dual Detection of the Conductivity and Spectrophotometry for the Simultaneous Determination of Common Inorganic Anionic Species and Cations in River and Wastewater

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  • NAKATANI Nobutake
    Department of Biosphere & Environmental Sciences, Faculty of Environmental Systems, Rakuno Gakuen University Graduate School for International Development and Cooperation, Hiroshima University
  • KOZAKI Daisuke
    Graduate School for International Development and Cooperation, Hiroshima University
  • MORI Masanobu
    Graduate School of Engineering, Gunma University
  • HASEBE Kiyoshi
    Faculty of Human Life Sciences, Fuji Women’s University
  • NAKAGOSHI Nobukazu
    Graduate School for International Development and Cooperation, Hiroshima University
  • TANAKA Kazuhiko
    Graduate School for International Development and Cooperation, Hiroshima University

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Simultaneous determinations of common inorganic anionic species (SO42−, Cl−, NO3−, phosphate and silicate) and cations (Na+, NH4+, K+, Mg2+ and Ca2+) were conducted using an ion-chromatography system with dual detection of conductivity and spectrophotometry in tandem. The separation of ionic species on a weakly acidic cation-exchange resin was accomplished using a mixture of 100 mM ascorbic acid and 4 mM 18-crown-6 as an acidic eluent (pH 2.6), after which the ions were detected using a conductivity detector. Subsequently, phosphate and silicate were analyzed based on derivatization with molybdate and spectrophotometry at 700 nm. The detection limits at S/N = 3 ranged from 0.11 to 2.9 μM for analyte ionic species. This method was applied to practical river water and wastewater with acceptable criteria for the anion-cation balance and comparisons of the measured and calculated electrical conductivity, demonstrating the usefulness of the present method for water quality monitoring.

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  • Analytical Sciences

    Analytical Sciences 27 (5), 499-, 2011

    社団法人 日本分析化学会

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