Kinetic Determination of Total Iodine in Urine and Foodstuffs Using a Mixed Acid as a Pretreatment Agent

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  • TOMIYASU Takashi
    Department of Earth and Environmental Sciences, Faculty of Science, Kagoshima University
  • NONAKA Misa
    Department of Earth and Environmental Sciences, Faculty of Science, Kagoshima University
  • UCHIKADO Makoto
    Department of Earth and Environmental Sciences, Faculty of Science, Kagoshima University
  • ANAZAWA Katsuro
    Department of Earth and Environmental Sciences, Faculty of Science, Kagoshima University
  • SAKAMOTO Hayao
    Department of Earth and Environmental Sciences, Faculty of Science, Kagoshima University

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説明

An analytical method for the determination of total iodine at the ng level in urine, biological materials and foods was investigated. The organic substances were completely decomposed using a mixed solution of nitric, perchloric and sulfuric acids as pretreatment agents at ca. 230°C. Iodine in the resulting solution was analyzed by a kinetic-photometric method based on the catalytic effect of iodine on the oxidation of chlorpromazine by hydrogen peroxide. The relative standard deviation was 1.6% for 100 ng of iodide and the detection limit of the method was 1.6 ng (3 σ). The proposed method was successfully applied to the determination of iodine at ng levels in real samples.

収録刊行物

  • Analytical Sciences

    Analytical Sciences 20 (2), 391-393, 2004

    社団法人 日本分析化学会

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