3-(2-ヒドロキシフェニル)-1-フェニルトリアゼン-N-オキシドを用いるニオブ及びタンタルの蛍光定量

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タイトル別名
  • Fluorometric determination of niobium and tantalum with 3-(2-hydroxyphenyl)-1-phenyltriazene-N-oxide.
  • ３‐（２‐ヒドロキシフェニル）‐１‐フェニルトリアゼン‐Ｎ‐オキシドを用いるニオブ及びタンタルの蛍光定量
  • 3 2 ヒドロキシフェニル 1 フェニルトリアゼン N オキシド オ モチイル

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As a fluorometric reagent for various metal ions, 3- (2-hydroxyphenyl) -1-phenyltriazene- N-oxide (HPTO) was first synthesized, and then the fluorescence was compared with those of scandium, yttrium, lanthanum, zirconium, hafnium, thorium, niobium and tantalum complexes from an analytical view point. The fluorescence intensities of the metal complexes decreased in the following order : Sc (III) >Nb (V) > Ta (V) >Zr (IV), Hf (IV) > Y (III), Th (IV), La (III). Scandium, niobium and tantalum complexes emit intense fluorescence, while yttrium, lanthanum, zirconium, hafnium and thorium complexes emit weak fluorescence. As a fluorometric reagent for niobium and tantalum, HPTO was excellent regarding both sensitivity and reproducibility. Under the optimal conditions, niobium and tantalum could be determined in the following concentration ranges : niobium, 0.057 μg/25 ml (Ex. 439 nm/Em. 539 nm, pH 5.0); tantalum, 0.110 μg/25 ml (Ex. 420 nm/Em. 537 nm, pH 6.0). The relative standard deviation was 1% (n= 5) for 0.2 ppm of niobium or tantalum. In an aqueous medium, niobium and tantalum were found to form a 1: 1 complex with HPTO. The optimal reaction conditions and interference studies are described.

収録刊行物

  • 分析化学

    分析化学 46 (3), 195-199, 1997

    公益社団法人 日本分析化学会

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