滇池北岸城郊红壤对磷的吸附特征

研究滇池北岸红壤对可溶性磷的等温吸附及动力学特征，比较不同质量红壤对不同浓度磷的吸附参数差异。结果表明：红壤对可溶性磷的吸附随振荡时间的延长而增加；对磷的等温吸附同时符合朗格缪和弗兰德利希等温吸附方程；在恒温条件下，红壤对磷的吸附量随磷浓度的上升而增加，但吸附率逐渐下降。通过红壤吸附磷的吉布斯自由能计算，进一步证明红壤吸附磷具有自发性；对比同类基质材料磷的吸附量，发现本地红壤具有较大的吸附能力，同时具备经济、易获取等优点。

Phosphorus Adsorption Characteristics of Red Soil in Northern Suburban Area of the Dianchi Lake

The kinetics parameters and isothermal phosphorus adsorption of red soil in the northern suburban area of the Dianchi Lake were studied, and the differences in phosphorus adsorption parameters for different phosphorus concentration by soils with varied qualities were also compared. The results showed that the amount of phosphorus adsorbed by red soil increased as the vibration duration was prolonged. The isothermal phosphorus adsorption conformed to both Langmuir and Freundlish equations. Under the same temperature, the amount of phosphorus adsorbed increased along with the rising of phosphorus concentration, but the absorption rate dropped gradually. It was showed by Gibbs free energy calculation that the phosphorus adsorption process by red soil occurred spontaneously. Compared with other substrate material, the red soil has many advantages including higher adsorption capacity, lower in price and richer in local resources, so it was proposed that red soil should be given priority to be utilized to tackle with non - point phosphorus pollution in the northern suburban area of the Dianchi Lake.