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Updated: Jul 15, 2026

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
Published on: March 6, 2014
[Study on phosphorus(P) fixation in the sediment of lake using the clays modified by LaCl3]
Xian-Zheng Yuan1, Gang Pan, Bing-Hui Tian
1State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. wayney@126.com
Abstract:
14 kinds of clay modified by LaCl3 were prepared and their phosphorus(P) fixation was studied. The effect of pH on adsorption rate of P using kaolin modified by LaCl3 and dissolved concentration of La3+ from them were also discussed. The results showed that the fixation rates of P using clay modified by LaCl3 were improved to 52% - 95% from 3% - 14% using unmodified clay. The maximum adsorption rate of P using kaolin modified by LaCl3 was 94.85% on the pH value of 5. Under the condition of pH range from 4 to 8, the P adsorption rate was higher than 80%. When the pH value was higher than 6.5, the dissolved concentration of La3+ from the modified clay was lower than 0.017 8 mg/L.
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