湖底堆積物からみた諏訪湖における汚染物質の集積過程

概要

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Sedimentation of Lake Suwa is much affected by flood sediments even in the center of the lake. The concentrations of dioxins and PAHs are diluted by such event sediment composed mainly of inorganic,non-contaminated materials. Flood sediment layers dated on 10 June 1950, 29 June 1961 and 28 September 1983 are confirmed in the cored sediments from Lake Suwa. Although the persistent organic pollutants are low in the floodsediments compared with the normal sediments below and above, the total amount of pollutants deposited in one flood is much larger than the annual amount of normal sediments. The annual changes of the persistent organic pollutants amount in the normal sediments well correspond with the history of human activities around the lake. Chemical and other analyses must be based sedimentary unit identified by lithology and density.
地質汚染－医療地質－社会地質学会の論文