Estimation Method of Fractions of Geological Environment and Atmospheric Fallout Based on Long-distance Transport and Domestic Origin of Sulfate in Headstream Water in Mountainous Area, Shikoku Island

DOI Web Site 1 References
  • IMAI Shoji
    Division of Natural Science, Graduate School of Technology, Industrial and Social Sciences, Tokushima University
  • YAMAMOTO Yuhei
    Division of Natural Science, Graduate School of Technology, Industrial and Social Sciences, Tokushima University
  • NAGASAKI Shota
    Department of Chemistry, Faculty of Integrated Arts and Sciences, Tokushima University
  • KUROTANI Isao
    Department of Chemistry, Graduate School of Integrated Arts and Sciences, Tokushima University
  • UEI Yusuke
    Department of Chemistry, Faculty of Integrated Arts and Sciences, Tokushima University
  • OKUDA Keiko
    Department of Chemistry, Faculty of Integrated Arts and Sciences, Tokushima University
  • NAKAO Yuko
    Department of Chemistry, Faculty of Integrated Arts and Sciences, Tokushima University

Bibliographic Information

Other Title
  • 四国山岳地域における渓流水中硫酸イオンの長距離輸送及び国内起源に基づく地質環境画分と大気降下物画分の推計法

Abstract

<p>Temporal-special distribution of dissolved major anions at 64 sites in headstreams without any direct human activity of the Shikoku mountainous area in Japan was investigated from autumn to early winter from 2009 to 2012. It was proposed in this work that sulfate ion (SO42−) concentration in the headstream water was differentiated into fractions of geologic environment and atmospheric fallout consistent with long-range transportation and domestic origin. The geologic environment SO42− was obtained to be 2-3 μmol L−1 in metamorphic rock belts, limestone and granite areas, 21 μmol L−1 in sedimentary rock belt, and 10 μmol L−1 in chert areas. In the sites above phase boundary layer height and with less effect of domestic origin, a correlation of the fallout fraction of SO42− increased exponentially against the elevation between the sampling site and the highest point in the catchment area. It was considered that the accumulation phenomena of SO42− was caused by deposition from the upper atmospheric layer accumulating PM2.5. The domestic origin of SO42− under 480 m alt. of sampling site was increased in the order of categories faced to East Seto > West Seto > Bungo Channel > Kii Channel > Tosa Bay.</p>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 73 (4.5), 131-140, 2024-04-05

    The Japan Society for Analytical Chemistry

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