Combined use of aromatic amine and diamines as catalytic indicators for compleximetric and precipitation titration.

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  • ABE Shigeki
    Department of Applied Chemistry, Faculty of Engineering, Yamagata University
  • WATANABE Ken
    Department of Applied Chemistry, Faculty of Engineering, Yamagata University
  • SUGAI Teruo
    Department of Applied Chemistry, Faculty of Engineering, Yamagata University

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Other Title
  • キレート及び沈殿滴定における接触指示系としての芳香族アミン及びジアミン類の組み合わせ効果
  • キレート オヨビ チンデン テキテイ ニ オケル セッショク シジケイ トシテ

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Abstract

Catalytic indication methods for detecting the end point of the EDTA titration of Mn2+and the precipitation titration of halide ions (Cl-, Br-, and I-) have been developed. As indicator reaction the coupling reaction of p-phenylenediamine (I) and m-aminophenol (II) catalyzed by traces of Mn2+ in 0.4M hydrogencarbonate solution containing 0.06% hydrogen peroxide and that of (I) and m-phenylenediamine (III) cataly zed by traces of Ag+ are utilized. In contrast to oxidation products of single amine substrate, the absorption maximum of these coupling products shows a bathochromic shift and the solution turns instan taneously reddish violet (I-II) or violet (I-III) by the action of the metal ion catalyst. A mixed o-toluylene diamine and (II) indicator system is also useful for catalytic titration of Mn2+. This catalytic method has been applied to the substitution titration of Zn2+, Cd2+, and Pb2+. In catalytic precipitation titration of halide ions, Br - and I- are titrated in aqueous solution, while Cl- is determined in non-aqueous or mixed solvent, i. e. methanol or 50% acetone. Milligram amounts of metal ions (Mn2+, Zn2+, Cd2+, Pb2+) and halide ions (Cl-, Br-, I-) are determined with the relative standard deviation of 0.1%,

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 32 (6), 398-400, 1983

    The Japan Society for Analytical Chemistry

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