Synchronous First-Derivative Fluorescence Determination of Boron with 1,8-Dihydroxynaphtalene

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  • Watanabe Kunihiro
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science
  • Kimishima Yasuki
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science
  • Iwata Junichi
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science
  • Shitanda Isao
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science
  • Itagaki Masayuki
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science

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Other Title
  • １，８‐ジヒドロキシナフタレンを用いるホウ素のシンクロナス‐一次微分蛍光定量
  • 1,8-ジヒドロキシナフタレンを用いるホウ素のシンクロナス-一次微分蛍光定量
  • 1 8 ジヒドロキシナフタレン オ モチイル ホウソ ノ シンクロナス 1ジ ビブン ケイコウ テイリョウ

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Description

The size of the blank value is enumerated in one of the factors that influence the detection limit in the fluorescence determination method, and it is brought about by excess reagent. In general, removing the influence of the excess reagent is needed because a high blank value may often cause a decrease in the reproducibility. To remove the influence of excess reagent, the solvent-extraction method etc. is used besides a method of changing the pH. 1,8-Dihydroxynaphthalene (1,8-DHN) with a similar structure to chromotropic acid is a reagent that is easily extracted into organic solvent because it doesn't have a sulfo group. 1,8-DHN generates a complex of boron to be the 6-membered ring. This study attempted a fluorescence determination of boron by keeping the complex in the aqueous phase, and extracted the excess reagent in the organic phase. The boron-1,8-DHN complex in aqueous phase was detected by measuring the fluorescence intensities (λex = 305 nm, λex = 360 nm). Moreover, the calibration curve by using a synchronous - derivative fluorescence method was linear over the range of 0 to 120 ppb. The limit of detection was 1.7 ppb. The relative standard deviation at 30 ppb B was 2.8% (n = 5). The detection limit was improved to about 1/10 by using the synchronous - derivative fluorescence method. The result of applying this proposed method to standard river water showed good agreements with the certified values.<br>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 56 (3), 151-157, 2007

    The Japan Society for Analytical Chemistry

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