バングラデシュ帯水層を想定したヒ素溶出作用因子の挙動解析  [in Japanese] Behaviors of arsenic leaching factors imaging the Bangladesh aquifers  [in Japanese]

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Abstract

嫌気性条件下における地下水へのヒ素溶出を助長する種々の物質の影響を実験的に調査した.その結果, リン酸系の物質は化学的特性からヒ素溶出に強く影響することが判明した. 特に有機リンの代表として添加したトリフェニルボスフィンではコントロールに対して630倍の溶出濃度がみられた. また, アンモニアのようなpH値がアルカリ側にある物質の添加でも顕著なヒ素溶出が認められた. 一方, 微生物の作用について考察するとともに, 微生物の特定を試みている. また, 地下水流動解析の一助のために帯水層中の化学平衡時の分配係数を求めた.

The influences of various chemicals causing anaerobic arsenic leaching from sediment towards groundwater in the alluvial aquifers in Bangladesh were investigated. Consequently, significant influence on arsenic leaching was observed by using phosphoric acid as a leaching agent. Leaching was further promoted when organic phosphate particularly triphenylphosphine, concentration 630 times against control, was utilized. Conversely, remarkable arsenic leaching was also noticed in an alkaline condition by using ammonia. Besides, functions of microorganisms were also examined. Finally, estimation of sorption reaction coefficients was performed to be used with the fundamental equations illustrating arsenic transport in the reducing aquifers.

Journal

  • ENVIRONMENTAL ENGINEERING RESEARCH

    ENVIRONMENTAL ENGINEERING RESEARCH (45), 1-8, 2008

    Japan Society of Civil Engineers

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