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2012 Fiscal Year Final Research Report

Speciation of Ca in terrestrial water and its role in element cycle in forested ecosystem

Research Project

  • PDF
Project/Area Number 20540477
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Geochemistry/Astrochemistry
Research InstitutionNational Institute for Environmental Studies

Principal Investigator

KOSHIKAWA Masami (KANAO Masami)  独立行政法人国立環境研究所, 地域環境研究センター, 主任研究員 (80291045)

Project Period (FY) 2008 – 2012
Keywords有機錯体カルシウム / 有機錯体アルミニウム / 渓流水 / 土壌溶液
Research Abstract

In our previous study, we found that acidic deposition in Japan has already resulted in elevated concentrations of NO3- + SO42- in stream waters, and a high level of Ca (instead of Al) is serving as a major counterion for NO3- + SO42-. However, an additional loading of acidic deposition may result in shortage of Ca (essential element for plants) and mobilization of Al (toxic element for plants and fishes). We also found that reactive Al increased in proportion to the DOC/Ca ratio in Japanese stream waters, which imply the higher ratio of (organic ligand concentration)/(competitive cation concentration) in solution enhancing formation of soluble organic aluminum complexes. In this study, we tried to determine concentrations of soluble organic calcium complexes in stream waters in order to evaluate the influence of calcium complex on behavior of aluminum. We determined calcium ion concentration (CaI) using calcium ion selective electrode, reactive calcium concentration (CaR) using ion chromatography, and organic calcium complex concentration as a difference between CaR and CaI. However, we unexpectedly found the tendency of calcium ion selective electrode to overestimate CaI under dilute sample such as stream waters. It was found that more selective method is necessary to determine soluble organic calcium complexes in stream waters

  • Research Products

    (6 results)

All 2012 2011 2010

All Journal Article (2 results) Presentation (4 results)

  • [Journal Article] 新潟県三面川水系における渓流水質と集水域の地質および地形の関係2011

    • Author(s)
      越川昌美,渡邊未来,高松武次郎,林誠二,野原精一,佐竹研一
    • Journal Title

      陸水学雑誌

      Volume: 72 Pages: 75-84

  • [Journal Article] 霞ヶ浦湖水におけるアルミニウムの化学形態.2010

    • Author(s)
      越川(金尾)昌美, 渡邊未来, 越川海, 小松一弘, 今井章雄, 稲葉一穂, 高松武次郎
    • Journal Title

      分析化学

      Volume: 59 Pages: 1137-1142

  • [Presentation] 筑波山における渓流水中Ca濃度と集水域地質の関係2012

    • Author(s)
      越川昌美, 渡邊未来, 渡邊圭司, 林誠二
    • Organizer
      日本陸水学会
    • Place of Presentation
      名古屋大学(愛知県)
    • Year and Date
      2012-09-14
  • [Presentation] 霞ヶ浦湖水におけるアルミニウムの化学形態2011

    • Author(s)
      越川昌美, 渡邊未来, 越川海, 小松一弘, 今井章雄, 稲葉一穂, 高松武次郎
    • Organizer
      日本陸水学会
    • Place of Presentation
      島根大学(島根県)
    • Year and Date
      2011-09-23
  • [Presentation] 筑波山の窒素飽和森林における無機態窒素の流入量と流出量の算定2010

    • Author(s)
      渡邊未来, 林誠二, 三浦真吾, 山村茂樹, 渡邊圭司, 越川昌美, 高松武次郎
    • Organizer
      日本陸水学会
    • Place of Presentation
      弘前大学(青森県)
    • Year and Date
      2010-09-19
  • [Presentation] 高窒素負荷を受ける森林集水域の林内環境が窒素流出に及ぼす影響について2010

    • Author(s)
      林誠二, 渡邊未来, 山村茂樹, 渡邊圭司, 越川昌美
    • Organizer
      日本陸水学会
    • Place of Presentation
      弘前大学(青森県)
    • Year and Date
      2010-09-19

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Published: 2014-08-29  

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