Variations in the Concentration of Dissolved Metal Ions and their Buffering Effect in an Acidified River Environment

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概要

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• The concentration variations of dissolved metal ions and their buffering effect in an acidified river were investigated by analyzing the data collected through a long-term field investigation and an intensive field investigation. The field investigations targeted Matsukawa River in Japan, which is acidified by the inflow of acid mine drainage. In periods of rainfall and snowmelt, Al, Mn, Fe, Cu, and Zn ions exhibited different decreasing trends than did alkali and alkaline earth metal ions and sulfate. These findings suggested that the decreases in Al, Mn, Fe, Cu, and Zn ion concentration were attributable not only to dilution by the inflow of rainwater and snowmelt but also to the hydrolysis of Al. Additionally, the mineral phases of Al in this acidified river were analyzed by using the geochemical modeling software (PHREEQC). From the results, dissolved Al ions acted as a buffer from pH 4 to 6, and the basaluminite (Al<SUB>4</SUB>(SO<SUB>4</SUB>)(OH)<SUB>10</SUB>) as the dominant chemical species, mainly controlled the solubility of Al from pH 4 to 6.

• Japan Society on Water Environmentの論文

著者

• Endo Masatoshi

  Graduate School Of Science And Engineering Yamagata University

• Hara Akira

  Graduate School Of Science And Technology Chiba University

• Sasaki Atsushi

  Technical Division Of Instrumental Analysis Faculty Of Engineering Yamagata University

• ENDO Masatoshi

  Graduate School of Science and Engineering, Yamagata University, Japan

• YOSHIKAWA Eishi

  Graduate School of Science and Engineering, Yamagata University, Japan

• TAMAKI Yusaku

  Graduate School of Science and Engineering, Yamagata University, Japan

• HIKICHI Kazuhiro

  Graduate School of Science and Engineering, Yamagata University, Japan

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