Highly Sensitive Visual Colorimetry for Chromium(VI) by Ion-Pair Solid-Phase Extraction on a PTFE-Type Membrane Filter

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  • WATANABE Takahiro
    Department of Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University
  • MIZUGUCHI Hitoshi
    Department of Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University
  • SHIDA Junichi
    Department of Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University

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Other Title
  • ＰＴＦＥ製メンブランフィルターへのイオン対固相抽出によるクロム（ＶＩ）の高感度目視定量
  • PTFE製メンブランフィルターへのイオン対固相抽出によるクロム(6)の高感度目視定量
  • PTFEセイ メンブランフィルター エ ノ イオンツイコソウ チュウシュツ ニ ヨル クロム 6 ノ コウカンド モクシ テイリョウ

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Abstract

A simple and highly sensitive visual determination method for Cr(VI) based on ion-pair solid-phase extraction to a PTFE-type membrane filter has been developed. A colored complex that was formed through a reaction between Cr(VI) and diphenylcarbazide was adsorbed quantitatively under the coexistence of sodium dodecyl sulfate (SDS). The colored filter was sandwiched in between two slide glasses after putting a drop of water in order to prevent discoloration, which was caused by drying the colored filter. The concentration of Cr(VI) was determined through a visual comparison with the color standard. The visual detection limit was 0.3 μg dm−3. The calibration curve, assessed with the reflection spectrometric response (540 nm), was linear in the concentration range 0∼4 μg dm−3 (r = 0.998). The detection limit, defined as three-times the standard deviation of the reagent blank, was 0.07 μg dm−3 in 100 cm3 of the sample solution. The relative standard deviation (RSD) for 0.3 μg dm−3 Cr(VI) was 6.0% (n = 5). The proposed method was applied to the determination of Cr(VI) extracted from metallic parts.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 60 (4), 339-344, 2011

    The Japan Society for Analytical Chemistry

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