Precipitation of Calcium Carbonate in a Dammed up Lake(Lake Ono) with Drainage Basin in a Limestone Area.
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概要
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Dammed up lake Ono is located in the northeast part of Ube-shi, Yamaguchi Prefecture. Since limestone comprises part of drainage basin of rivers flowing into the lake, the Ca concentration of the lake water is comparatively high (20-25 mg⋅l<SUP>-1</SUP>), though still beneath the level of hard water.<BR>Although a high saturation index of CaCO<SUB>3</SUB> (calcite) was confirmed in the epilim-nion of the lake, no precipitation was detected.<BR>A laboratory test, however, demonstrated that addition of a few seed crystals of calcite (8-9 μm in diameter) to the lake water adjusted the temperature and pH to summer conditions (25°C, pH 9.12). This warming, together with addition of NaOH induced precipitation of CaCO<SUB>3</SUB> along with phosphate, thus eliminating about 20% of Ca ions in the lake water. This phenomenon was not observed when pH was adjusted by decarbonization.
- 日本陸水学会の論文
日本陸水学会 | 論文
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