Geochemical analyses of groundwater of Yumigahama Peninsula, western part of Tottori Prefecture, Japan

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  • 鳥取県西部,弓ヶ浜の地下水の水質分析
  • トットリケン セイブ ユミガハマ ノ チカスイ ノ スイシツ ブンセキ

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Abstract

Agricultural practice, especially white welsh onion has been largely cultivated utilizing abundant groundwater in Yumigahama sandbar, San'in district, southwest Japan. Groundwater, however, maybe contaminated from these activities and domestic wastes. Chemical species of ground water are analyzed to evaluate present situation of water quality. Twenty seven samples of groundwater generally show neutrality or slightly acid in pH, and lower EC varying from 300 to 600μS/cm. Water chemistry can be divided into two types in terms of concentration of nitrogen species. Relatively higher NO_3^- concentrations (over 5mg/l) occur in groundwater of southeastern and northwestern areas, while significantly higher NH_4^+ (>0.5mg/l) and Fe species (>0.5mg/l) values appear in the central part of the peninsula. Both types show variation in PO_4^<3-> concentrations up to 3mg/l. The former type may be related to aerobic condition of aquifers with possible contamination from domestic waste and agricultural practices. The latter type is probably related to anaerobic conditions of aquifers, due perhaps to stagnation of aquifer or increasing supply of fertilizers and domestic wastes. Arsenic species release from soils and sediments occur in the latter type, of which water chemistry is characterized by lower values of DO (less than 2mg/l, excluding one sample) and free NO_3^-.

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