酸性降下物の河川・堆積物への影響について –堆積物中の交換性アルミニウムを指標とした評価–  [in Japanese] Acid deposition and its effects on river water and sediments –Evaluation of exchangeable aluminum in sediments as an index of acidification–  [in Japanese]

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Author(s)

Abstract

River sediment is thought to show average composition of the upstream watershed. We examined a method, using exchangeable aluminum Ex-Al, and the effects of acid deposition on influencing water composition. An index of acidification was established. First, the most useful method for measuring Ex-Al in sediment was evaluated. According to the contact tests with atmospheric precipitation and sediments, H<sup>+</sup> and SO<sub>4</sub><sup>2-</sup> in the precipitation samples were adsorbed to biotite, and the amount of Ex-Al in the sediments increased. Acid deposition, river water composition and Ex-Al in sediments were measured at a mountain region site in southwest Nagano Prefecture, where granite was the basement rock. High acid deposition was measured at this site in the comparison with the mean value at 20 stations in Nagano Prefecture, and the alkalinity of river water was below 0.2 meq/l in this upstream region. Because of this, it was suggested that the experiment catchment area was highly sensitive to acid rain. Ex-Al was detected but quite variable from sediments in this area which received the influence of acid deposition. So sediment Ex-Al is thought to be a good index to show influence of acid deposition on river waters.

Journal

  • Chikyukagaku

    Chikyukagaku 29(2), 137-145, 1995

    The Geochemical Society of Japan

References:  25

Cited by:  1

Codes

  • NII Article ID (NAID)
    110008679907
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0386-4073
  • NDL Article ID
    3916122
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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