Chemical Composition of Discolored Seawater around Satsuma-Iwojima, Kagoshima, Japan

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  • NOGAMI Kenji
    Department of Chemistry, Faculty of Science, Tokyo Institute of Technology:(Present address)Kusatsu-Shirane Volcano Observatory, Tokyo Institute of Technology
  • YOSHIDA Minoru
    Department of Chemistry, Faculty of Science, Tokyo Institute of Technology
  • OSSAKA Joyo
    Faculty of Agriculture, Tamagawa University

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Other Title
  • 薩摩硫黄島周辺に発生している変色海水の化学組成
  • 薩摩硫黄島周辺に発生している変色海水の化学組成〔英文〕
  • サツマ イオウジマ シュウヘン ニ ハッセイシテ イル ヘンショク カイスイ

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Abstract

Discolored seawater is generated along the seashore of Satsuma Iwojima as a result of mixing of acidic hot spring water with seawater. Variation of chemical composition of the discolored seawater due to the change of the mixing ratio at Higashi Hot Spring to seawater was examined. Chemical compositions in Si-Fe-Al 3-components system and color tone of the precipitates depended on the pH-value of the discolored seawater. Chemical compositions of the mixtures of the precipitates and the coexistent solutions reflected that of the hot spring water. It indicates that the discolored seawater is composed of a simple mixture of hot spring water and seawater without any separation processes such as removal of precipitate from discolored seawater.

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