秋田県渋黒川–玉川水系における流入する酸性温泉水と河川水の混合過程についてのストロンチウムおよび硫黄同位体比ならびに溶存化学成分を用いた解明

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タイトル別名
  • Elucidation of mixing process of acidic hot spring water and river water based on Sr and S isotopic ratios and chemical composition of dissolved components in Shibukuro and Tama Rivers, Akita, Japan
  • アキタケン ジュウ クロカワ – タマガワ スイケイ ニ オケル リュウニュウ スル サンセイ オンセンスイ ト カセンスイ ノ コンゴウ カテイ ニ ツイテ ノ ストロンチウム オヨビ イオウ ドウイタイヒ ナラビニ ヨウゾンカガク セイブン オ モチイタ カイメイ

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説明

In the Shibukuro and Tama River system, Akita, where river water is acidified by inflow of acidic hot spring water, mixing process of confluent river water is explained by changes in the isotope ratios of Sr and S as well as the chemical composition of dissolved components. Based on the relationships between Sr and S isotopic ratios and their reciprocal concentrations, the mixing ratio of waste water from a neutralization plant of acidic hot spring water with river water of Shibukuro River was estimated as 1 to 1, and at the confluence of Shibukuro and Tama Rivers the mixing ratio of these two was estimated to be 3 to 7 or 4 to 6. These mixing ratios were mostly consistent with those obtained from the concentrations of dissolved chemical components. These consistent mixing ratios suggest that the chemical composition of river water was mainly controlled by the mixing of the waste water and the tributary river waters, and the influence of precipitation of insoluble salts was negligible. The contribution of the waste water was about 10% at Tose located downstream from the confluence of Shibukuro and Tama Rivers.

収録刊行物

  • 地球化学

    地球化学 49 (3), 153-161, 2015

    一般社団法人日本地球化学会

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