宮城県主要河川沖積平野部の土壌ヒ素濃度と東北地方太平洋沖地震津波の影響  [in Japanese] ARSENIC CONTENTS OF SOIL IN THE ALLUVIAL PLAINS OF MAJOR RIVERS IN MIYAGI PREFECTURE, JAPAN, AND INFLUENCE OF THE 2011 OFF THE PACIFIC COAST OF TOHOKU EARTHQUAKE TSUNAMI  [in Japanese]

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Abstract

土壌および水域のヒ素汚染は人間の健康や食糧の生産に大きな影響をもたらす.本研究では,東北地方太平洋沖地震津波によって海底堆積物が打ち上げられた宮城県沿岸部土壌のヒ素含有量の状況を知るための調査を行った.県内主要河川の沖積平野部において,津波被災域と非被災域の土壌サンプルを採取し,ヒ素含有量を測定した.その結果,全ての沖積平野部において,津波被災域のヒ素含有量平均値は非被災域の平均値より高いことが明らかとなった.また,各河川流域の地質構成や産業活動によって,河川沖積平野部および津波堆積物のヒ素含有量は異なることが知られた.さらに,津波堆積物によってもたらされたヒ素は,7ヶ月~1年の時間経過によって下層の土壌に移行して従来土壌のヒ素高濃度化を引き起こしていることが知られた.

 The arsenic contamination of soil causes a huge damage on human health and production of food. In this study, the arsenic pollution of the sea shore areas of Miyagi Prefecture, Japan, where marine sediment was brought onto the land surface by the 2011 off the Pacific coast of Tohoku earthquake tsunami was investigated. Seventy eight soil samples were collected from both the tsunami disaster regions and the non-tsunami disaster regions of each major river alluvial plain in Miyagi prefecture. The arsenic contents of those soil samples were analyzed by an atomic absorption photometer. The results showed that in each river alluvial plain, the average of the arsenic content of the tsunami disaster region soil is higher than that of the non-tsunami disaster region. Furthermore, the arsenic content of each alluvial plain soil and the tsunami deposit reflected on the geological features and the anthropogenic activities (mining, hot spring, etc.) in the river basins. These results suggested that the arsenic contamination of the soil of major river alluvial plains that were suffered from the tsunami disaster was enlarged by the tsunami deposit which accumulated arsenic in the marine sediments during long time period of the river flows.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)

    Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 69(1), 19-24, 2013

    Japan Society of Civil Engineers

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