Potentiometric flow injection determination of manganese(II) by using a hexacyanoferrate(III)-hexacyanoferrate(II) potential buffer

Hiroki Ohura, Yuko Ishibashi, Toshihiko Imato, Sumio Yamasaki

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    6 Citations (Scopus)

    Abstract

    A highly sensitive potentiometric flow injection analysis method for the determination of manganese(II), utilizing a redox reaction with hexacyanoferrate(III) in near neutral media containing ammonium citrate is described. The analytical method is based on the detection of the change in potential of a flow-through type redox electrode detector, resulting from the composition change of an [Fe(CN)6]3--[Fe(CN)6]4- potential buffer solution. A linear relationship between the potential change (peak height) and the concentration of manganese(II) was found. Manganese(II) in a wide concentration range from 10-4 to 10-7 M could be determined by appropriately altering the concentration of the potential buffer from 10-3 to 10-5 M. The lower detection limit of manganese(II) was determined to be 1 × 10-7 M. The sampling rate and relative standard deviation were 20 h-1 and 1.9% (n = 8) for 6 × 10-6 M manganese(II), respectively. The proposed method was successfully applied to the determination of manganese(II) in actual soil samples obtained from tea fields. Analytical results obtained by the proposed method were in good agreement with those obtained by an atomic absorption spectrophotometric method.

    Original languageEnglish
    Pages (from-to)177-184
    Number of pages8
    JournalTalanta
    Volume60
    Issue number1
    DOIs
    Publication statusPublished - May 28 2003

    All Science Journal Classification (ASJC) codes

    • Analytical Chemistry

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