Fluorometric Determination of Trace Amounts of Fluoride Ion Using an Expanded Porphyrin

M. Tabata, K. Kaneko, Y. Murakami, Y. Hisaeda, H. Mimura

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    19 Citations (Scopus)

    Abstract

    A highly selective and sensitive method of fluorometry is described for determination of the fluoride ion at the parts per billion level via the ion-pair complex formation of the fluoride ion with an expanded prophyrin [2,23-diethyl-8,17-bis(2-ethoxycarbonylethyl)-3,7,12,13,18,22-hexamethyl sapphyrin (H3sap)]. The ion-pair complex gives out an enhanced fluorescence intensity at 680 nm on excitation at 450 nm. Since the present method is based on a direct reaction of the fluoride ion with the sappyrin, a 200-fold amount of the aluminum (III) ion [10-4M (M = mol dm-3)] and a 2000-fold amount of the iron(III) ion (10-3M) over the fluoride ion did not interfere with determination of the fluoride ion at concentrations as low as 5 × 10-7M in the presence of 1,2-diaminocyclohexane-N,N,N′,N′-teraacetic acid. The proposed method was applied to determination of the fluoride ion in various water samples (tap water, river water, rain water, underground water, and hot spring water) and satisfactory results were obtained.

    Original languageEnglish
    Pages (from-to)136-144
    Number of pages9
    JournalMicrochemical Journal
    Volume49
    Issue number2-3
    DOIs
    Publication statusPublished - Apr 1 1994

    All Science Journal Classification (ASJC) codes

    • Analytical Chemistry
    • Spectroscopy

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