不同灌溉模式下太湖流域稻田土对磷的吸附特性
Adsorption Characteristics of Phosphorus on the Paddy Soils under Different Irrigation Pattern Collected from Lake Taihu Basin
DOI: 10.12677/WPT.2018.63019, PDF,    科研立项经费支持
作者: 吕学研：江苏省环境监测中心，江苏 南京；吴时强, 戴江玉, 薛万云, 杨倩倩：南京水利科学研究院水文水资源与水利工程科学国家重点实验室，江苏 南京；陈亚男：中国环境监测总站，国家环境保护环境监测质量控制重点实验室，北京
关键词: 灌溉模式；太湖流域；稻田土；磷；吸附；Irrigation Pattern； Basin of Lake Taihu； Paddy Soil； Phosphorus； Adsorption
摘要: 以太湖流域不同灌溉模式下的稻田土为材料，开展磷的吸附试验。结果表明，磷在两种稻田土上的吸附动力学过程均可分为明显的快吸附、慢吸附和吸附平衡三个阶段，且均以准二级吸附动力学方程的拟合结果最佳；无论是理论平衡吸附量、试验平衡吸附量还是吸附速率常数，均显示漫水灌溉高于控制灌溉。磷在两种稻田土上的吸附等温线均属于Langmuir I型，Langmuir和Freundlich方程均能很好地拟合等温吸附结果，但是以Freundlich方程的拟合结果更好。Freundlich方程的拟合结果表明，两种稻田土吸附磷的Kf分别为29.59 (漫水灌溉)和29.31 [(mg/kg)/(L/mg)n](控制灌溉)，n值分别为1.34和1.48，说明控制灌溉模式下稻田土颗粒表面的不均匀性稍高，也说明控制灌溉模式下稻田土磷吸附过程的反应强度稍高。两种稻田土磷的解吸量与吸附量均呈极显著相关，且磷的解吸能力差异不大。
Abstract: Paddy soils under different irrigation pattern were collected from basin of Lake Taihu for laboratory adsorption experiment of phosphorus. Results showed that the adsorption dynamic processes of phosphorus on the two paddy soils could both be divided into fast stage, slow stage and equilibrium stage. The dynamic data could be fitted best by the pseudo-second-order rate equation. The theoretic equilibrium adsorptive capacity, the experiment equilibrium adsorptive capacity and the constant of adsorption rate under flooding irrigation pattern were all higher than those under controlling irrigation pattern. Adsorption isotherms of phosphorus on the two paddy soils both fell into the type of Langmuir I. Both of Langmuir equation and Freundlich equation could fit the isothermal adsorption data, and the fitting result of Freundlich equation was better. Fitting results of Langmuir equation showed that the saturation adsorption capacity of phosphorus on the paddy soil under flooding irrigation pattern was higher than that under controlling irrigation pattern, as well as the maximum buffer capacity, but the adsorption strength express reversed. The Freundlich equation fitting results showed the Kf of flooding irrigation was little higher than that of controlling irrigation. The values of Kf were 29.59 and 29.31 [(mg/kg)/(L/mg)n], respectively. Meanwhile, the parameter n was also got from the fitting results of Freundlich equation. For flooding irrigation paddy soil, n = 1.34, which was little lower than that of controlling irrigation paddy soil (n = 1.48). This express that there was a higher unhomogeneity on the soil particle surface under controlling irrigation, and the reaction strength on it was higher. There was significant correlation between each pair of desorption amount and adsorption amount. The desorption ability of the two kinds of paddy soil did not display obvious difference.
文章引用：吕学研, 吴时强, 戴江玉, 薛万云, 杨倩倩, 陈亚男. 不同灌溉模式下太湖流域稻田土对磷的吸附特性[J]. 水污染及处理, 2018, 6(3): 150-158. https://doi.org/10.12677/WPT.2018.63019

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