Dependence of Coulometric Efficiency on Flow Rate in Flow Injection Coulometry with Rectangular Thin-Layer Cells

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  • 直方体型薄層セルを用いるフローインジェクション・クーロメトリーによる絶対量測定条件の検討
  • チョクホウタイガタ ハクソウ セル オ モチイル フロー インジェクション クーロメトリー ニ ヨル ゼッタイリョウ ソクテイ ジョウケン ノ ケントウ

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Abstract

The use of rectangular thin-layer cells (TLCs) for detecting electrochemically oxidizable (or reducible) substances in flow injection coulometry was studied. TLCs with planar or stripe platinum electrodes set on a basement and of different heights (h = 20 and 33 μm), length (l = 12 and 18 mm) and width (l = 7 mm) were tested. Coulometric yield vs. flow rate plots indicate that there is a maximum flow rate, vmax, characteristic of the TLCs used and the substances tested, and that when the flow rate is lower than vmax the coulometric yield is always equal to 100% (with errors less than, e.g., 1%); also, the yield is less than 100% when the flow rate is less high. Theory is presented to predict the vmax values for each of the TLC, using a planar or stripe electrode. The theoretical vmax values are compared with the experimental results.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 58 (3), 135-140, 2009

    The Japan Society for Analytical Chemistry

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