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Yoshihiro Ganzawa
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Yukiko Watanabe
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Kaori Ban
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Tetsuo Hashimoto
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Author's Organization:Institute of Earth-science,Hakodate College,Hokkaido University of Education Institute of Earth-science,Hakodate College,Hokkaido University of Education Institute of Earth-science,Hakodate College,Hokkaido University of Education Department of Chemistry,Faculty of Science,Niigata university