ストロンチウム濃度を指標とする地下水動態調査の試み

概要

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This research aimed to verify the restoration of a water vein in Hachioji-Minamino City. The developer of the new town had made an attempt to link some separated water veins with artificial strata of gravel. An aqueous solution of Sr^<2+> was injected into a probable upstream point (B12-3) of a vein, and every 2 weeks after that the Sr^<2+> levels in water samples from four probable downstream points were analyzed. About 40 days after at one (S-16) of the four points, an extraordinary increase in the Sr^<2+> concentration was observed. At the same time, the concentration levels of Ca^<2+>, Mg^<2+> and Na^+ and the electric conductivity suddenly increased. These show that the two points, B12-3 and S-16, are linked to each other and that Sr^<2+> is a suitable stable indicator for analyzing underground water veins. The concentration levels of the abovementioned cations were also observed every month for underground water samples from several sampling points where the water vein was supposed to be independent of the present tracer investigation. The quartile deviations for the observed values were shown mostly within 5% for a very long time, a max. of 34 months.
社団法人日本分析化学会の論文
2003-10-05