陸水中の化学物質濃度の変動について

概要

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Variation in the concentrations of some chemical constituents in precipitation was studied from January, 1967 through October, 1971 at Kichijoji, Tokyo. (1) Annual variation of Cl^- and SO_4^<2-> concentrations. The Cl^- concentration shows the maximum in December and the minimum in April. The SO_4^<2-> concentration reaches the maximum in December-January and the minimum in June. (2) Secular variation of Cl^- and SO_4^<2-> concentrations. There is a steadily increasing tendency from year to year, with a single exception of 1967-70 when SO_4^<2-> concentration remains the same. (3) Chemical constituents concentrations in precipitation and air mass trajectories. Concentrations of constituents in precipitation depends on the trajectories of air masses from which precipitation is supposed to be derived. Precipitation derived from the air mass which has passed through the industrial area contains higher amount of Zn^<2+>, Cl^-, SO_4^<2-> and Ca^<2+>.
日本地球化学会の論文