Title: Effects of Dissolved Oxygen on the Changes of Overlying Water Quality and the Uptake of Phosphate by Sediment
Abstract:Effects of aerobic and anoxic environment on the changes of the overlying water quality and the phosphate uptake by sediments with the presence and absence of light in East Taihu Lake were investigate...Effects of aerobic and anoxic environment on the changes of the overlying water quality and the phosphate uptake by sediments with the presence and absence of light in East Taihu Lake were investigated. The results show:the sediments can uptake phosphate from the overlying water with high mass concentration, but the rate and quantity of uptake were different in different conditions; pH of the overlying water in the anoxic environment was higher or a little higher than that in the aerobic environment with the same light condition. During the first 20 days of the experiment, aerobic environment is benefit to the phosphate uptake in sediment, which caused the rapid decrease in phosphate concentration in the overlying water and adsorption equilibrium. After 20 days, the phosphate concentrations in the overlying water in light and anoxic environment decrease rapidly, and they were much lower than those in other experimental conditions. The increased concentrations of total phosphorus in the experimental sediment under the aerobic environment were higher than those under the anoxic environment,with the order of contents:aerobic with no lightaerobic with lightanoxic with lightanoxic without light.Dissolved oxygen concentration had significant effect on the Fe bound phosphate and Ca bound phosphate,and had little effect on the organic phosphate.Read More
Publication Year: 2004
Publication Date: 2004-01-01
Language: en
Type: article
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Cited By Count: 1
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