Sensitive extraction-spectrophotometric determination of zinc with 1,10-phenanthroline and tetraiodofluorescein.

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  • HOSHI Suwaru
    Department of Environmental Engineering, Kitami Institute of Technology
  • INOUE Sadanobu
    Department of Environmental Engineering, Kitami Institute of Technology
  • MATSUBARA Mutsuya
    Department of Environmental Engineering, Kitami Institute of Technology

Bibliographic Information

Other Title
  • １，１０‐フェナントロリンとテトラヨードフルオレセインを用いる亜鉛の高感度抽出吸光光度定量
  • 1,10 フェナントロリン ト テトラヨードフルオレセイン オ モチイル アエ
  • 1,10-フェナントロリンとテトラヨードフルオレセインを用いる亜鉛の高感度抽出吸光光度定量

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Abstract

In the presence of some masking agents, the ion-pair of zinc (II)-1, 10-phenanthroline (phen) complex cation with tetraiodofluorescein (TIF) can be extracted selectively into chloroform from alkaline solution(pH 7.5 10.5). The extracted complex has a composition of [Zn(II)-(phen)2](TIF). This extraction method was applied to the spectrophotometric determination of zinc. The recommended procedure is as follows. To a solution containing up to 2.0μg of zinc in a separatory funnel, 1 ml of 0.025 M phen, 5 ml of 0.1 M borax buffer(pH 9.3), and 2 ml of 1.25×10-3 M TIF are added and the mixture is made up to 25 ml with water. After 5 min, the solution is shaken with 5 ml of chloroform for 7 min. After two phases are separated with a centrifuge, the absorbance of organic phase is measured at 549 nm against the reagent blank. Beer's law holds up to 0.22.0 μg of zinc and its apparent molar absorptivity at 549 nm is 1.15×105 dm3 mol-1 cm-1. Pretreatment method was also investigated by using a strong base anion exchanger for lower tolerant metals {Ni(II), Mn(II), and Cu(II)}.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 34 (9), 549-553, 1985

    The Japan Society for Analytical Chemistry

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