Environmental Characteristics of Precipitations Based on Both Oxygen Stable Isotopic Ratio and Concentrations of Rare Earth Elements (REEs), Thorium (Th), Uranium (U) in Niigata Prefecture

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  • KANO Naoki
    Department of Chemistry and Chemical Engineering, Faculty of Engineering, Niigata University
  • KIKUCHI Takehiro
    Graduate School of Science and Technology, Niigata University
  • SAKAMOTO Nobuo
    Graduate School of Science and Technology, Niigata University
  • IMAIZUMI Hiroshi
    Department of Chemistry and Chemical Engineering, Faculty of Engineering, Niigata University
  • MURAYAMA Hitoshi
    Niigata Prefectural Research Laboratory for Health and Environment
  • YAGOH Hiroaki
    Niigata Prefectural Research Laboratory for Health and Environment
  • OHIZUMI Tsuyoshi
    Acid Deposition and Oxidant Research Center (ADORC)

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Other Title
  • 酸素安定同位体比および希土類元素, トリウム, ウラン濃度から見た新潟県における降水の特徴

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Abstract

In order to investigate the characteristics (or the sources) of Precipitations in Niigata Prefecture, oxygen stable isotopic ratios (i.e., δ18O) and the concentrations of rare earth elements (REEs), thorium (Th), and uranium (U) in the precipitation samples were measured. The precipitation samples were collected using a filtrating bulk sampler every two weeks at 3 points in Niigata Prefecture during the period from December 2003 to December 2004.<BR>Consequently, the following matters have been mainly clarified. (1) In rainy season, δ18O value of Precipitations was the smallest. (2) In regard to δ18O value, “Continental effect” and “Amount effect” was generally observed in this work. On the other hand, “Temperature effect” was remarkably found only in winter. (3) The concentrations of trace metallic elements (REEs, Th, U) increased in spring. (4) REEs in precipitations might have been derived from a crustal source as well as oceanic source, while anthropogenic source was not negligible.

Journal

  • RADIOISOTOPES

    RADIOISOTOPES 55 (6), 307-317, 2006

    Japan Radioisotope Association

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