雨水の風成塵起源フッ化物イオン濃度と非海塩性硫酸およびカルシウムイオン濃度の関係

概要

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Concentrations of nssF^-, nssSO_4^<2-> and nssCa^<2+> in 94 rainwater samples collected at Yashiro, Hyogo Prefecture, Morioka, Iwate Prefecture and Fukaura, Aomori Prefecture, Japan, were determined and correlations between nssF^- and nssSO_4^<2-> or nssCa^<2+> concentrations of the rainwater samples were analyzed. The origin of chemical species (X) was discussed using the enrichment factor (E) as defined by E=(X/Na)rainwater/(X/Na)seawater, where Na^+ is used as the reference element for sea salt. In Yashiro, Morioka and Fukaura, the E factors of SO_4^<2->, Ca^<2+> andF^- were lower in the Kosa period (dust event in Japan) (Dec. to May) than the non-Kosa period (Jan. to Nov.), indicating large amounts of sea salt were incorporated into the rainwater by a seasonal wind in the Kosa period. In Fukaura, which is located in the near Japan Sea coast, much lower E factors were observed under the strong influence of sea salt than in Yashiro and Morioka, which are inland areas. There were highly significant correlations between nssF^- and nssSO_4^<2-> or nssCa^<2+> concentrations. Consequently, these chemical species in Japanese rainwater saples are of aerosol (eolian dust and coal soot) origin, transported from the Asian Continent.
社団法人日本土壌肥料学会の論文
1998-10-05