Absorption of oxygen dissolved in water by bottom soil (Preliminary report)
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概要
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1. Decrease of oxygen dissolved in water close, to the bottom with the lapse of time was studied experimentally.<BR>2. Mud or sand was put into cylindrical glass vessels with adequate depths and water was poured upon them. These vessels were placed quietly in a room with slight temperature change.<BR>3. Using a special water sampling apparatus, a small amount of water was sampled from 0 cm, 1. 5 cm, 3 cm above the bottom and from the surface respectively, at some time intervals up to 30 days. The oxygen content was measured by the poralograph-method.<BR>4. Vertical gradient in oxygen content appeared near the bottem owing to oxygen consumption by the soil and became remarkable with progress of time. This gradient was observed as high as about 2 cc/L/cm.<BR>5. Extent of the gradient was approximately proportional to the quantity of the soil used. This may indicate that, besides the soil that is in direct touch with upper water, even the soil in deeper place actively consumes the oxygen.
- 日本陸水学会の論文
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