奈良県内における河川の酸性化調査

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タイトル別名
  • Investigation on Acidification of River Waters in Nara Prefecture
  • ナラ ケンナイ ニ オケル カセン ノ サンセイカ チョウサ

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Investigations on acidification of river waters were performed four times per year (total numbers of eight times) at 91 investigation points in four basin systems (Yamato river basin system (YaBS), Yodo river basin system (YoBS), Kino river basin system (KBS) and Shinguu river basin system (SBS) ) in Nara Prefecture over a period of two years from fiscal years 2001 to 2002. Acidification of river waters was not recognized in the four basin systems. However, electrical conductivity (E.C.) of waters from three investigation points in YoBS and four investigation points in SBS were below 5mS/m, and alkalinity of those from three investigation points in YoBS and three investigation points in SBS were below 0.2meq/l This suggests that waters at the points may be easily affected by acid rain. Accordingly, five investigation points (one investigation point in YoBS and four investigation points in SBS) may be easily affected by acid rain judging from both alkalinity and E.C. Long term trends of pH value of waters at those five points showed that two points (downstream of Fukatani river and Sakamoto dam lake) out of five had clear decreasing trends since middle of the 1970s.

収録刊行物

  • 環境化学

    環境化学 15 (1), 103-116, 2005

    一般社団法人 日本環境化学会

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