河川水中の水銀の挙動について

概要

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In order to clarify the form in which mercury is transported in a river, we improved the method to analyse low content of mercury and fractionated the river water by membrane filters. We confirmed that the membrane filter does not absorb the mercury unspecifically and therefore it does not affect the measured mercury value of river water. We also examined the bed sediment of the river. Dried bed sediment was fractionated into various particle sizes. The organic carbon content and the mercury concentration of each fractions were estimated. The following results have been obtained. (1) The concentration of mercury of the filtrate decreased with the pore size of membrane filter. (2) The dissolved mercury content, or the mercury content of river water filtered by membrane filter of the smallest pore size, is constant no matter how the total mercury content of river water is. And total mercury content depends upon the mercury content of the floating substance of the river. (3) In the bed sediments mercury is contained much more in finer particles than the larger. Mercury content of each particle size is correlated with the organic carbon content. As a result we concluded that major part of mercury is transported in the forms of both floating substance and bed sediment in the river.
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