Fluorometric determination of niobium and tantalum with 3-(2-hydroxyphenyl)-1-phenyltriazene-N-oxide.

MORISHIGE Kiyotoshi, UEMURA Koji, KIMURA Fumihiko, NISHIKAWA Yasuharu

doi:10.2116/bunsekikagaku.46.195

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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
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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Abstract

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.

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BUNSEKI KAGAKU

BUNSEKI KAGAKU 46 (3), 195-199, 1997

The Japan Society for Analytical Chemistry

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