Determination of Trace Boron in Environmental Waters by Adsorptive Stripping Voltammetry Using Beryllon III

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  • Nabekawa Hidenori
    Faculty of Engineering, Tokyo University of Science
  • Sato Masaki
    Faculty of Engineering, Tokyo University of Science
  • Hayashi Hideo
    Faculty of Engineering, Tokyo University of Science Present address, Tokyo Metropolitan Industrial Technology Research Institute
  • Tanaka Tatsuhiko
    Faculty of Engineering, Tokyo University of Science

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Other Title
  • ベリロンＩＩＩを用いた吸着ストリッピングボルタンメトリーによる環境水中微量ホウ素の定量
  • ベリロン3を用いた吸着ストリッピングボルタンメトリーによる環境水中微量ホウ素の定量
  • ベリロン 3 オ モチイタ キュウチャク ストリッピング ボルタンメトリー ニ ヨル カンキョウ スイチュウ ビリョウ ホウソ ノ テイリョウ

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Abstract

A sensitive adsorptive stripping voltammetry, based on the formation of the complex of boron(III) with 4-[(4-diethylamino-2-hydroxyphenyl)azo]-5-hydroxynaphthalene-2,7-disulfonic acid (Beryllon III) is described for the determination of trace boron in environmental water samples. The complex was accumulated on a hanging mercury-drop electrode at −0.35 V vs. SCE for 60 s under stirring in 0.06 M nitrate−0.04 M sulfate supporting electrolyte (pH 4.5), and was subsequently cathodically stripped to −0.8 V vs. SCE at a scan rate of 10 mV s−1 by using a differential pulse mode. A reduction peak belonging to the adsorbed complex was observed at around −0.4 V vs. SCE in the stripping voltammogram. The influence of foreign elements on the boron determination was evaluated. The interferences of aluminum(III), iron(III) and silicon(IV) were eliminated by adding metaphosphoric acid. The calibration graph {peak height vs. boron(III) concentration} was linear over the concentration range of 0.2∼100 ng mL−1 (correlation coefficient>0.999), with a relative standard deviation (n = 4) of 2∼7%. The proposed method without using troublesome preconcentration steps was applied to the determination of trace boron in several environmental water samples with good precision and accuracy.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 58 (9), 815-819, 2009

    The Japan Society for Analytical Chemistry

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