An estimation of the origin of sulfate ion in rain water in view of sulfur isotopic variations

DOI Web Site 17 Citations
  • KITAMURA Moritsugu
    Ishikawa Prefectural Institute of Public Health and Environmental Science
  • SUGIYAMA Minoru
    Department of Earth Sciences, Faculty of Science, Nagoya University: (Present address) Water Research Institute, Nagoya University
  • OHHASHI Tetsuji
    Department of Earth Sciences, Faculty of Science, Nagoya University: (Present address) INAX Corp.
  • NAKAI Nobuyuki
    Department of Earth Sciences, Faculty of Science, Nagoya University: (Present address) Institute of Grobal Science

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Other Title
  • 硫黄安定同位体比からみた石川県の降水中硫酸イオンの起源の推定
  • イオウ アンテイ ドウイタイヒ カラ ミタ イシカワケン ノ コウスイチュウ

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Abstract

We surveyed the sulfur isotope ratio of sulfate in rain waters collected in Kanazawa city from December 1986 to November 1991 to investigate the origin of sulfate in rain waters. The sulfur isotope ratio of sulfate in rain waters varied from +0.9 to +14.7‰ and its average was +6.3‰. The ratio was higher in winter than that in the other seasons. The sulfur isotope ratio of nss-sulfate which was calculated by elimination of the contribution of sea salts from the sulfur isotope ratio of rain water sulfate also showed relatively higher value in winter. This seasonal variation suggested that sulfate in the rain waters collected in winter was mainly derived from the source having a higher sulfur isotope ratio, such as coal combustion in northern China, (north of Yangtze-jiang).

Journal

  • Chikyukagaku

    Chikyukagaku 27 (2), 109-118, 1993

    The Geochemical Society of Japan

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