Cyclic flow injection system for iodide ion determination using a temperature-regulated colorimetric switching mechanism of iodine and starch reaction

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  • KATO Yumi
    TLO, Japan Analysis & Evaluation Center (JAEC)
  • ISHII Yui
    TLO, Japan Analysis & Evaluation Center (JAEC)
  • WAKAO Ryohei
    Department of Industrial Chemistry, School of Science and Technology Meiji University
  • AMANO Yoshikazu
    Department of Industrial Chemistry, School of Science and Technology Meiji University
  • ISHII Mikita
    TLO, Japan Analysis & Evaluation Center (JAEC) Department of Industrial Chemistry, School of Science and Technology Meiji University
  • YAMADA Masaaki
    Department of Applied Chemistry, Graduate School of Engineering, Tokyo Metropolitan University

Bibliographic Information

Other Title
  • ヨウ素・デンプン呈色反応の温度制御スイッチング機構を利用するヨウ化物イオン測定用循環式吸光光度検出／フローインジェクション分析システム
  • ヨウソ デンプン テイショク ハンノウ ノ オンド セイギョ スイッチング キコウ オ リヨウ スル ヨウカブツ イオン ソクテイヨウ ジュンカンシキ キュウコウ コウド ケンシュツ フローインジェクション ブンセキ システム

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Description

A cyclic FIA system was designed for a determination of iodide ion with considering both environmental protection and a rapid, easy, economical and convenient operation. The proposed system consisted of the most simplified one line by popular colorimetric detection. A coloring switching system depending on the reaction temperature between iodine and starch was used for the proposed cyclic FIA. The present cyclic system by a 100 μl sample injection method under operating conditions of a 30°C to 60°C switching temperature and a reagent flow rate of 2.5 ml min−1 was available for 50 repeated runs with the 100 ml reagent solution. The calibration for the determination of iodide ion was linear between 1.0×10−5 M and 5.0×10−4 M in 100 μl sample injection. The reproducibility of the proposed method in a 100 μl sample injection was less than 1% in terms of relative standard deviation in 5 repeated runs with the 5.0×10−4 M iodide ion standard solution. The analytical time required was 30 s for one sample. The selectivity of the present method was good, and two Cr2O72− and SO42− anions giving the next larger absorbance signal to that of the iodide ion had a negligibly small interference in a (1 + 1) mixed solution of 5.0×10−4 M iodide ion standard with their foreign ions tested.<br>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 53 (8), 827-832, 2004

    The Japan Society for Analytical Chemistry

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