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

KATO Yumi, ISHII Yui, WAKAO Ryohei, AMANO Yoshikazu, ISHII Mikita, YAMADA Masaaki

doi:10.2116/bunsekikagaku.53.827

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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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Abstract

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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