氯化镧对西湖底泥磷缓释及磷固定作用研究

采取外西湖4个样点的底泥,对其进行理化性质分析,并用氯化镧改性底泥,对改性前后底泥的磷吸附能力和固定能力进行对比分析.结果显示,4个样中除S2以外,其他三处的有机质含量都在30μg/g以上（33.51~35.34μg/g）,有效磷含量在102.11~171.95 mg/g;pH在6.0~6.5之间.通过氯化镧改性,底泥的磷吸附效果明显,而不同土样对磷的固定效果存在很大差异;高温处理能提高底泥的磷吸附能力.底泥对磷的吸附机理复杂,结论认为通过氯化镧改性底泥固定和缓释水体磷的方法对西湖是否适用需进一步进行深入研究.

Preliminary Study on Phosphorus(P) Adsorption and Fixation of the West Lake Sediment Modified by LaCl3

The paper analyzes the physical and chemical property of four shares of sediment samples from the West Lake, and modifies the properties of the sediments by LaCl3 , measures the phosphorus adsorption and fixation rates of the unmodifie and modified sediments. The result shows that the organic matter content of the sediment samples（S1,S3,S4） is all above 30μg/g（33.51-35.34μg/g ）, and the available phosphorus content of the sediment samples（S1, S3, S4） is all above 100 mg/g（102. 11-171.95 mg/g）. The pH of the four sediment samples is between 6. 0 and 6. 5. Besides, the phosphorus absorption rate of modified sediment has been improved visibly（6.2% to 26.9%）, but there are tremendous differences among the fixation rates of the four modified sediment samples. It also shows that high-temperature treatment can improve the phosphorus absorption rate of sediment samples whether it is modified or not. However, the adsorption principle of the sediment was very complicated. At present, we can not confirm whether the method（sediment modification） is suitable to phosphorus reduction of the West Lake or not. It needs further in-depth study.