On-line concentration and flow analysis of trace amounts of bismuth with anion-exchange method and ion-exchanger absorptiometry.

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Other Title
  • 超微量ビスマスのオンライン陰イオン交換濃縮及びイオン交換体吸光光度法による流れ分析
  • チョウ ビリョウ ビスマス ノ オンライン インイオン コウカン ノウシュク
  • 超微量ビスマスのオンライン陰イオン交換濃縮及びイオン交換体吸光光度法による流れ分析(<特集>超微量分析のための前処理と予備濃縮)

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Abstract

Ultra-trace amounts of Bi (0.0120.5 nmol) in various samples were preconcentrated as chloro complexes from 0.10.6 mol dm-3 chloride solution with an anion-exchanger column {0.5g of Dowex 1-X8 (100200 mesh) in the chloride form}. With the column, water samples up to at least 1 dm3 could be treated. The Bi in the column was desorbed with a 0.15 mol dm-3 sulfuric acid solution at a flow rate of 1.2 cm3 min-1, mixed with a solution containing 1 mol dm-3 potassium iodide at a flow rate of 0.3 cm3 min-1, and then introduced into a flow-through cell, the lightpath portion of which was filled with an anion-exchanger (QAE-Sephadex A-25). The light attenuation due to the iodo complexes of Bi selectively concentrated on the anion-exchanger of the flow-through cell could be measured directly at 472 nm with high precision. The calibration curve for Bi was linear. The colored bismuth-iodo complexes were easily desorbed with an acidic EDTA (0.001 mol dm-3) solution, so that the cell could be used repeatedly for the measurements. The present method was applied to the analysis of various samples such as rocks and metals.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 36 (11), 656-661, 1987

    The Japan Society for Analytical Chemistry

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