Direct measurement of the fluorescence characteristics of aquatic humic substances by a three-dimensional fluorescence spectrophotometer.

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  • NAGAO Seiya
    Natural Barrier Laboratory, Department of Environmental Safety Research, Japan Atomic Energy Research Institute
  • SUZUKI Yasuhiro
    Department of Chemistry, Faculty of Science and Technology, Kinki. University
  • NAKAGUCHI Yuzuru
    Department of Chemistry, Faculty of Science and Technology, Kinki. University
  • SENOO Muneaki
    Natural Barrier Laboratory, Department of Environmental Safety Research, Japan Atomic Energy Research Institute
  • HIRAKI Keizo
    Department of Chemistry, Faculty of Science and Technology, Kinki. University

Bibliographic Information

Other Title
  • 三次元分光蛍光光度計による天然水腐植物質の蛍光特性の直接測定法
  • 3ジゲン ブンコウ ケイコウ コウドケイ ニヨル テンネンスイ フショク ブッ

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Abstract

Humic substances play an important role in the transport of trace metals and insoluble organic materials. They are also considered to be precursors of trihalomethane in aquatic environments. The direct measurement of humic substances was carried out with a three-dimensional fluorescence spectrophotometer after filtering natural-water samples through a GF/F glass fiber filter. Because the influence of the humic concentration, pH and ionic strength on the three-dimensional excitation emission matrix spectra is negligible, the proposed method can be directly applied to the characterization of humic substances in freshwater samples (humic concentration 0.510 mg l-1, pH 69 and ionic strength <0.04 M) and sea-water samples (ionic strength 0.75 M). Humic substances in river, lake and pore water samples exhibit 23 peaks at excitation 305340 nm/emission 415440 nm and excitation 250270 nm/emission 440450 nm. These peak positions correspond to those of fulvic acids isolated from soil.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 46 (5), 335-342, 1997

    The Japan Society for Analytical Chemistry

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