On-site Catalytic Determination of Trace Chromium(VI) in Fresh Water Using <i>o</i>-Phenylenediamine–Hydrogen Peroxide Reaction

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  • SHINDO Junpei
    Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi Environmental Technology Center Co.,Ltd.
  • KAWAKUBO Susumu
    Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
  • YAMANOI Takashi
    Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
  • SUZUKI Yasutada
    Center of Instrumental Analysis, University of Yamanashi

Bibliographic Information

Other Title
  • <i>o</i>-フェニレンジアミン—過酸化水素反応を利用する淡水中の極微量クロム（VI）の接触定量と現場分析
  • o-フェニレンジアミン-過酸化水素反応を利用する淡水中の極微量クロム(Ⅵ)の接触定量と現場分析
  • o-フェニレンジアミン-カサンカスイソ ハンノウ オ リヨウ スル タンスイ チュウ ノ キョクビリョウ クロム(Ⅵ)ノ セッショク テイリョウ ト ゲンバ ブンセキ

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Abstract

A sensitive and selective method for determination of Cr(VI) has been developed using chromium-catalyzed oxidation of o-phenylenediamine with hydrogen peroxide. Under an optimized condition, the absorbance at 430 nm and at a fixed reaction time of 10 min was proportional to the concentration of Cr(VI) up to 1 mg L−1. A detection limit (DL) was 1 μg L−1. On-site determinations were carried out using a laboratory-made palm-top size colorimeter with a red-green-blue light emitting diode. Measurement of the absorbance for blue light was used for the determination up to 1 mg L−1 with a DL of 1 μg L−1. A kinetic study derived an on-site reaction time of τ = τoexp[b(1/T–1/To)], where the standard reaction time τo = 10 min, b = 7.65×103, a standard reaction temperature To = 298 K. By this equation, τ giving an absorbance value at τo and To can be calculated for any on-site temperature (T) between 20 and 40°C. On-site analyses within an error of 6% were carried out without control of reaction temperature and with a laboratory-prepared calibration curve at τo and To. The proposed method was successfully applied to natural and standard river-water samples and an industrial waste-water sample.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 61 (2), 103-108, 2012

    The Japan Society for Analytical Chemistry

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